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BS 46-1-1958 键和键槽及锥形销.键和键槽规范.pdf

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BS 46-1-1958 键和键槽及锥形销.键和键槽规范.pdf

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Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BRITISH STANDARD CONFIRMED OCTOBER 1985 Specification for Keys and keyways BS 46-1:1958 Incorporating Amendment Nos. 1, 2 and 3 UDC 621.886.8 BS 46-1:1958 标准分享网 www.bzfxw.com 免费下载 Co-operating organizations Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations:— Admiralty* Air Ministry Associated Officers’ Technical Committee Association of Consulting Engineers (Incorporated) British Chemical Plant Manufacturers’ Association British Compressed Air Society British Electrical and Allied Manufacturers’ Association* British Engineers’ Association* British Gear Manufacturers’ Association* British Internal Combustion Engine Manufacturers’ Association* British Iron and Steel Federation* British Railways, The British Transport Commission Crown Agents for Oversea Governments and Administrations D.S.I.R. — Mechanical Engineering Research Laboratory* Electricity Council, the Generating Board and Area Boards in England and Wales Engineering Equipment Users’ Association* Gas Council High Commission of India* Institute of Marine Engineers Institute of Petroleum Institution of Civil Engineers Institution of Gas Engineers Institution of Heating and Ventilating Engineers Institution of Mechanical Engineers* Institution of Mechanical Engineers (Automobile Division) Institution of Production Engineers* Locomotive and Allied Manufacturers’ Association of Great Britain* Machine Tool Trades Association* Ministry of Labour and National Service (Factory Inspectorate) Ministry of Power Ministry of Supply* Ministry of Transport and Civil Aviation Ministry of Works National Coal Board National Physical Laboratory (D.S.I.R.) Radio Industry Council War Office This British Standard, having been approved by the Mechanical Engineering Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council on 30 May 1958 © BSI 01-2000 First published (as BS 46) September 1909 First revision (as BS 46-1) October 1924 Second revision April 1929 Third revision February 1953 Fourth revision May 1958 The following BSI references relate to the work on this standard:— Committee references, MEE/4, MEE/4/4 Draft for comment CX(MEE) 6855 The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Committee entrusted with the preparation of this standard:— Association of Crane Makers Bright Steel Bar Association British Cycle and Motor Cycle Industries’ Association British Internal Combustion Engine Research Association British Shipbuilding Research Association Gauge and Tool Makers’ Association Institution of Engineers and Shipbuilders in Scotland Keymakers’ Association Milling Cutter and Reamer Association North East Coast Institution of Engineers and Shipbuilders Society of British Aircraft Constructors Steelworks Plant Association Taper Pin Manufacturers’ Association Amendments issued since publication Amd. No. Date of issue Comments PD 3375 May 1959 PD 4022 January 1961 PD 5124 January 1964 Indicated by a sideline in the margin ISBN 0 580 35582 9 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI Contents BS 46-1:1958 Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Materials 1 3 The application of keys and keyways 1 a) Parallel keys 1 b) Taper keys 1 c) Tangential keys 2 d) Woodruff keys 2 4 Dimensions and tolerances of parallel and taper keys and keyways 2 5 Dimensions and tolerances of Woodruff keys and keyways 3 6 Dimensions of tangential keys and keyways 16 7 Dimensions of keys and keyways for marine tailshafts 17 8 Keys and keyways for tapered shaft ends 19 Appendix A Preferred lengths of keys 20 Appendix B Approximate equivalents of metric and inch units 22 Figure 1 — Variation in keyway depth in taper shaft 19 Figure 2 — Types of key and position of keyway in shaft 18 Table 1 — Rectangular parallel keys, keyways and keybars 4 Table 2 — Square parallel keys, keyways and keybars 6 Table 3 — Rectangular taper keys and keyways, gib-head or plain 9 Table 4 — Square taper keys and keyways, gib-head or plain 10 Table 5 — Woodruff keys and keyways 12 Table 6 — Comparison of Woodruff key numbers (Whitney, British and American) 14 Table 7 — Tangential keys 16 Table 8 — Rectangular parallel keys for marine tailshafts 17 Table 9 — Preferred lengths of plain keys, rectangular or square section, parallel or taper 20 Table10 — Preferred lengths of gib-head keys rectangular or square section 21 © BSI 01-2000 i Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BS 46-1:1958 标准分享网 www.bzfxw.com 免费下载 Foreword This standard makes reference to the following British Standards: BS 308, Engineering drawing practice. BS 350, Conversion factors and tables. BS 970, Wrought steels. BS 1916, Limits and fits for engineering. The standardization of keys and keyways was first considered by the Engineering Standards Committee (the original name and form of the present BSI). As a result Standard Specification No. 46, dealing only with rectangular parallel keys, keybars and keyways, was published in 1909. In subsequent revisions, other types of keys were added to the standard and Parts 2 and 3 of BS 46 were prepared for parallel splines and taper pins respectively. Parts 2 and 3 have since been further revised and Part 2 has been published as BS 2059. This revision of BS 46-1 for Keys and keyways has been prepared under the authority of The Mechanical Engineering Industry Standards Committee in response to requests for larger manufacturing tolerances. The various types of keys and keyways now have consistent dimensions and tolerances for each size as far as possible, and this will enable a standard range of cutters to be used for the machining of the various types of keyways. The increased tolerances recommended in this standard may entail more fitting of keys into keyways than was envisaged in the 1953 edition. This is inevitable with an increase in tolerance on the keys and keyways. Careful consideration has been given to various requests for increases in tolerances and also for decreases in tolerances but the Committee have come to the conclusion that the tolerances now given are those most acceptable to industry at the present time. The Committee responsible for this revision of BS 46-1, gave earnest consideration to the specification of limits and fits to BS 1916 for the keys and keyways specified. It was decided not to introduce these limits and fits as the key and keyway standard does not represent finished articles for prescribed conditions of assembly. It recommends dimensions and tolerances from which required fits can be obtained by fitting to meet most design requirements. The Committee was influenced in reaching this decision by the absence of a standard range of cutters for machining to BS 1916 and the non-availability of keybar to these limits at the time the revision of this standard was being prepared. This decision will be reviewed in the light of circumstances existing when further revision is contemplated. The principle of the dimensions and tolerances recommended is to provide for each key to be retained in the shaft rather more securely than in the mating hub but this can be varied to meet special applications within the dimensional limits recommended in this standard. The tables of preferred key lengths given in Appendix A have been revised to conform with present-day requirements and the key sizes have been brought into accord with Table 1, Table 2, Table 3 and Table 4. Whilst the details of radii and chamfers are not a mandatory part of this specification the recommendations shown are in graduated steps of nominal value instead of by formulae, as with the formulae of former issues a special cutter radius was required for each size of keyway. Each radius recommended now applies to a range of keyway sizes. Owing to the difficulties of obtaining keybar in thirty-seconds of inch, keys formerly of these sizes have been replaced by those which are more readily available. Minor changes in the range of shaft sizes have been made to accommodate this. ii © BSI 01-2000 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BS 46-1:1958 The revised table for keys and keyways for marine tailshafts has been compiled by the British Shipbuilding Research Association from a survey of the current practice of British shipbuilding and marine engineering firms and from theoretical and experimental studies. The table of Woodruff keys and keyways has been extended into the range of smaller sizes to meet requirements for instrument and similar purposes. To facilitate the changeover to the recommended Woodruff key designation as shown in Table 5, the obsolete key and cutter numbers have been given in Table 6. The notes relating to keys and keyways for tapered shaft ends have been retained unaltered. A requirement has been stated for tangential keys and the Type A tangential key of the 1929 issue of BS 46 has been reinserted in this revision. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. © BSI 01-2000 Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 24, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. iii Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI iv blank 标准分享网 www.bzfxw.com 免费下载 BS 46-1:1958 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI 1 Scope This British Standard relates to the following: a) Rectangular parallel keys and keyways. b) Square parallel keys and keyways. c) Rectangular taper keys and keyways, plain and gib-head. d) Square taper keys and keyways, plain and gib-head. e) Woodruff keys and keyways. f) Tangential keys and keyways. g) Keys and keyways for marine tailshafts. h) Keys and keyways for tapered shaft ends. Decimal values in the tables have been rounded off to three significant figures. NOTE This specification is based on British units. For the convenience of users approximate equivalents in metric units are given in Appendix B. More accurate conversions should be obtained from the tables in BS 350 “Conversion factors and tables”. 2 Materials a) Keys and keybar complying with Table 1 to Table 7 of this British Standard shall be manufactured from steel to En 6A, En 8 or En 9 of BS 970, “Wrought Steels,” and those complying with Table 8 from steel to En 4 or En 5. It is recommended that En 6A and En 8 steels should be cold drawn for keys in sections up to 2 in. square and hot rolled [En 8 in condition NGC 1 (Normalized)] for larger sections, and that En 9 steels should not be cold drawn for keys of sections larger than # in. square. b) Bright keybar is not normally available in sections over 1" in. 3 The application of keys and keyways As it is not possible to foresee the combination of design considerations for any given application, the selection of the proper type of key must rest with the design authority. The following are general recommendations for use when circumstances permit and when keying is preferred to other methods of transmitting torque (e.g. splines). a) Parallel keys. For use for transmitting unidirectional torques on transmissions not subject to heavy starting loads and where periodic withdrawal or sliding of the hub member may be required. In many instances, particularly couplings, a gib-head cannot be accommodated, and there is insufficient room to drift out the key from behind. In these cases it is necessary to withdraw the component over the key and a parallel key is essential. Parallel square and rectangular keys are normally side fitting with top clearance and are usually retained in the shaft rather more securely than in the hub. i) Rectangular. The general purpose key for shafts greater than 1 in. diameter. ii) Square. For use with shafts up to and including 1 in. diameter or for shafts up to 6 in. diameter where it is desirable to have a greater key depth than is provided by rectangular keys. In cases of stepped shafts the larger diameters are usually required by considerations other than torque e.g. resistance to bending. Where components such as fans, gears, impellers etc., are attached to the larger shaft diameter, the use of a key smaller than standard for that diameter may be permissible. As this results in unequal disposition of the key in the shaft and its related hub the dimensions H and h must be recalculated to maintain the T/2 relationship. b) Taper keys. For transmitting heavy unidirectional, reversing or vibrating torques and in applications where periodic withdrawal of the key may be a necessity. For transmitting unidirectional torques taper keys are top fitting, but may be top and side fitting where required. For transmitting reversing or vibratory torques taper keys may be top and side fitting where required. In this case the keyway in the hub should have the same width value as the keyway in the shaft (i.e., Columns 8 and 9 of Table 3 and Table 4). © BSI 01-2000 1 BS 46-1:1958 标准分享网 www.bzfxw.com 免费下载 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI Taper keys cannot be used in applications requiring a sliding hub member. i) Rectangular and square. Taper keys of rectangular section are for general purposes and are of less depth than square keys. Taper keys of square section are for use with shafts up to and including 1 in. diameter or for shafts up to 6 in. diameter where it is desirable to have greater key depth. ii) Gib-head. Gib-heads are provided to facilitate the withdrawal of keys. iii) Plain. Where little or no protuberance is permissible. c) Tangential keys. For the transmission of reversing torque, usually under conditions of heavy loading. d) Woodruff keys. For light applications, or angular location of associated parts on tapered shaft ends. These keys are not recommended for other applications, but if so used corner radii in the shaft and hub keyways are advisable to reduce stress concentration. 4 Dimensions and tolerances of parallel and taper keys and keyways The dimensions and tolerances for key and keyway widths given in Table 1, Table 2, Table 3 and Table 4 are based on the width of the key W and provide a fitting allowance. The fitting allowance is designed to permit an interference between the key and the shaft keyway and a slightly easier condition between the key and the hub keyway. The maximum and minimum values in Table 1, Table 2, Table 3 and Table 4 are based on the following: Width of key and keybar, W = Nominal size with a plus tolerance. Width of keyway in shaft, Ws = Nominal size with a minus tolerance. Width of keyway in hub, Wh = Nominal size with a plus tolerance. Minimum width of key = Maximum width of keyway in shaft. a) Parallel keys and keyways. i) The dimensions and tolerances for side-fitting keys of rectangular parallel section, and for the appropriate keybar and keyways shall be as given in Table 1. ii) The dimensions and tolerances for side-fitting keys of square parallel section and for the appropriate keybar and keyways shall be as given in Table 2. b) Taper keys and keyways. i) The dimensions and tolerances for taper keys of rectangular section with or without gib-heads shall be as given in Table 3. [See also Clause 3 b)]. ii) The dimensions and tolerances for taper keys of square section with or without gib-heads shall be as given in Table 4. (See also Clause 3 b)]. iii) The basic taper for all taper keys and keyways in hubs shall be 1 in 100. c) Depth of keyways. The depth of the keyway shall be obtained by measuring from the circumference of the shaft diametrically opposite, or from the bore of the hub to the root of the keyway along the centre line diametrically opposite and shall not be measured from the side corner. The method of dimensioning keyways in shafts and hubs on drawings should conform to the recommendations of BS 308, “Engineering drawing practice.” To obtain the dimensions for recording on the drawing, the keyway depths and tolerances shall be applied to the basic shaft diameter. d) Radii and chamfers. Corner radii are recommended for keyways, as stress concentration in corners may lead to failure. Keys and keybar are not normally chamfered or radiused in the condition as supplied, but this may be done at the time of fitting, or, by arrangement between the purchaser and the manufacturer, during manufacture. Radii and chamfers are shown as nominal values in columns of Table 1, Table 2, Table 3 and Table 4. The chamfer on the key should in each case be of the minimum value to clear the actual radius in the keyway. NOTE In the case of shrink and heavy force fits it may be found necessary to depart from the width and depth tolerances laid down for keys and keyways. Any variation in the width of keyway must be such that the greatest width is at the end from which the key enters. Any variation in the depth of keyway must be such that the greatest depth is at the end from which the key enters. Any variation in the thickness of the key must be such that the greatest thickness is at the end from which the key is driven. This specification does not take account of misalignment and or offset greater than that provided for in the size tolerance. In the case of shrink and heavy force fits, true alignment must be ensured. 2 © BSI 01-2000 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BS 46-1:1958 5 Dimensions and tolerances of woodruff keys and keyways The dimensions and limits of tolerances for British Standard Woodruff keys and keyways shall be as shown in Table 5. Provision is made in Table 5 for an optional alternative design of Woodruff key which differs from the normal form in its depth as shown at H in the sketch and Table. a) The designation of Woodruff key numbers. The following system is applied to Woodruff keys and Woodruff key cutters. The British and American designations are identical. Each key is designated by three or more significant digits. The last two digits give the nominal diameter in eighths of an inch. The digit or digits preceding the last two give the nominal width (thickness) in thirty-seconds of an inch. Thus No. 204 refers to a key 2/32 × 4/8 in., or 1/16 in. thick × 1/2 in. diameter, similarly, 1210 refers to a key 12/32 × 10/8 in., or 3/8 in. thick × 11/4 in. diameter. b) Depth of keyway. The depth of a Woodruff keyway shall be measured along the centre line from the periphery of the shaft, or the circumference of the hub bore, to the root of the keyway. The depth of the keyway in a tapered shaft shall be measured normal to the shaft surface. (This is illustrated in BS 308, “Engineering drawing practice”). Note on keys for larger shafts The sizes of shafts shown in Table 1, Table 2, Table 3 and Table 4 of this standard are those for which the respective types of keys are considered to be normally appropriate. For larger shafts, it is considered that tangential keys, multiple keys or splines would be more appropriate. However, if it is decided to use single parallel keys on shafts larger than those considered normal for such keys in this standard, the following formulae may be applied to establish (nominal) values related to the shaft diameter “d”. (For the purposes of the tables, “d” is the diameter of the largest shaft for each key size i.e. “d” corresponds to column 2 of the tables. For intermediate shaft diameters or shaft diameters larger than those of the tables, H should, of course, be calculated from (iii), using for “d” the nominal shaft diameter.) i) Key widh W = d-4ii) Key thickness T = d-6- for Table 1 and Table 3 or = d4-- for Table 2 and Table 4 (In Table 1 and Table 3, T has in some sizes been rounded off to maintain the inch fractional sizes.) iii) Keyway depth in shaft H = T-2-- + d-2- – d--4--2- – W---4----2iv) For parallel keys, keyway depth in hub h = (T – H) + X where X is a clearance such that X min. = H min. + h min. – T max. X max. = H max. + h max. – T min. The incremental pattern by which the tolerances (and clearance X) increase with shaft size may be seen from an inspection of the tables, but it should be noted that a point will be reached at which any further increase in tolerance (with increase in shaft size) would be neither necessary in manufacture nor acceptable in use. © BSI 01-2000 3 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI Table 1 — Rectangular parallel keys, keyways and keybars 标准分享网 www.bzfxw.com 免费下载 BS 46-1:1958 4 All dimensions are in inches. 1 2 Diameter of shaft Over Up to and including 3 Key size W×T 4 5 6 7 Key Width W Max. Min. Thickness T Max. Min. 8 9 10 11 Keyway in shaft Width Ws Min. Max. Depth H Min. Max. 12 13 14 15 16 17 18 19 20 Keyway in hub Width Wh Min. Max. Depth h Min. Max. Nominal Keyway radius & key chamfer ra Keybar Width W Max. Min. Thickness T Max. Min. 1 11/4 11/4 11/2 11/2 13/4 5/16 × 1/4 0.314 0.312 0.253 0.250 0.311 0.312 0.146 0.152 0.312 0.313 0.112 0.118 0.010 3/8 × 1/4 0.377 0.375 0.253 0.250 0.374 0.375 0.150 0.156 0.375 0.376 0.108 0.114 0.010 7/16 × 5/16 0.440 0.438 0.315 0.312 0.437 0.438 0.186 0.192 0.438 0.439 0.135 0.141 0.020 0.314 0.312 0.253 0.250 0.377 0.375 0.253 0.250 0.440 0.438 0.315 0.312 13/4 2 2 21/2 21/2 3 1/2 × 5/16 0.502 0.500 0.315 0.312 0.499 0.500 0.190 0.196 0.500 0.501 0.131 0.137 0.020 5/8 × 7/16 0.627 0.625 0.441 0.438 0.624 0.625 0.260 0.266 0.625 0.626 0.185 0.191 0.020 3/4 × 1/2 0.752 0.750 0.503 0.500 0.749 0.750 0.299 0.305 0.750 0.751 0.209 0.215 0.020 0.502 0.500 0.315 0.312 0.627 0.625 0.441 0.438 0.752 0.750 0.503 0.500 3 31/2 31/2 4 45 7/8 × 5/8 1 × 3/4 11/4 × 7/8 0.877 0.875 0.629 0.625 0.874 0.875 0.370 0.376 0.875 0.876 0.264 0.270 0.062 1.003 1.000 0.754 0.750 0.999 1.000 0.441 0.447 1.000 1.001 0.318 0.324 0.062 1.253 1.250 0.879 0.875 1.248 1.250 0.518 0.524 1.250 1.252 0.366 0.372 0.062 0.877 0.875 0.629 0.625 1.003 1.000 0.754 0.750 1.253 1.250 0.879 0.875 © BSI 01-2000 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI © BSI 01-2000 Table 1 — Rectangular parallel keys, keyways and keybars 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Diameter of shaft Over Up to and including Key size W×T Key Width W Max. Min. Thickness T Max. Min. Keyway in shaft Width Ws Min. Max. Depth H Min. Max. Keyway in hub Width Wh Min. Max. Depth h Min. Max. Nominal Keyway radius & key chamfer ra Keybar Width W Max. Min. Thickness T Max. Min. 56 67 78 89 9 10 10 11 11/2 × 1 1.504 1.500 1.006 1.000 1.498 1.500 0.599 0.605 1.500 1.502 0.412 0.418 0.062 13/4 × 11/4 1.754 1.750 1.256 1.250 1.748 1.750 0.740 0.746 1.750 1.752 0.526 0.532 0.125 2 × 13/8 2.005 2.000 1.381 1.375 1.998 2.000 0.818 0.824 2.000 2.002 0.573 0.579 0.125 21/4 × 11/2 2.255 2.250 1.506 1.500 2.248 2.250 0.897 0.905 2.250 2.252 0.619 0.627 0.125 21/2 × 15/8 2.505 2.500 1.631 1.625 2.498 2.500 0.975 0.983 2.500 2.502 0.666 0.674 0.187 23/4 × 17/8 2.755 2.750 1.881 1.875 2.748 2.750 1.114 1.122 2.750 2.752 0.777 0.785 0.187 1.504 1.500 1.006 1.000 Bright keybar is not normally available in sections larger than the above. 11 12 12 13 13 14 3 × 2 3.006 3.000 2.008 2.000 2.998 3.000 1.195 1.203 3.000 3.002 0.823 0.831 0.187 31/4 × 21/8 3.256 3.250 2.133 2.125 3.248 3.250 1.273 1.281 3.250 3.252 0.870 0.878 0.187 31/2 × 23/8 3.506 3.500 2.383 2.375 3.498 3.500 1.413 1.421 3.500 3.502 0.980 0.988 0.250 14 15 15 16 16 17 33/4 × 21/2 3.756 3.750 2.508 2.500 3.748 3.750 1.492 1.502 3.750 3.752 1.026 1.036 0.250 4 × 25/8 4.008 4.000 2.633 2.625 3.998 4.000 1.571 1.581 4.000 4.002 1.072 1.082 0.250 41/4 × 27/8 4.258 4.250 2.883 2.875 4.248 4.250 1.711 1.721 4.250 4.252 1.182 1.192 0.312 17 18 18 19 41/2 × 3 4.508 4.500 3.010 3.000 4.498 4.500 1.791 1.801 4.500 4.502 1.229 1.239 0.312 43/4 × 31/8 4.758 4.750 3.135 3.125 4.748 4.750 1.868 1.878 4.750 4.752 1.277 1.287 0.312 19 20 5 × 33/8 5.008 5.000 3.385 3.375 4.998 5.000 2.010 2.020 5.000 5.002 1.385 1.395 0.312 a NOTE The key chamfer shall be the minimum to clear the keyway radius. Nominal values are given. For larger shafts see the note following Clause 5. BS 46-1:1958 5 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI Table 2 — Square parallel keys, keyways and keybars 标准分享网 www.bzfxw.com 免费下载 BS 46-1:1958 6 1 2 3 4 5 Diameter of Shaft Over Up to and including Key size W×T Width W and Thickness T Max. Min. 1/4 1/2 1/2 3/4 3/4 1 1/8 × 1/8 3/16 × 3/16 1/4 × 1/4 0.127 0.190 0.252 0.125 0.188 0.250 6 7 8 9 Keyway in shaft Width Ws Min. Max. Depth H Min. Max. 0.124 0.187 0.249 0.125 0.188 0.250 0.072 0.107 0.142 0.078 0.113 0.148 10 11 12 13 Keyway in hub Width Wh Min. Max. Depth h Min. Max. 0.125 0.188 0.250 0.126 0.189 0.251 0.060 0.088 0.115 0.066 0.094 0.121 All dimensions are in inches 14 15 16 Nominal Keyway radius & key chamfer ra Bright keybar Width W and thickness T Max. Min. 0.010 0.010 0.127 0.125 0.190 0.188 0.010 0.252 0.250 1 11/4 11/4 11/2 11/2 13/4 5/16 × 5/16 3/8 × 3/8 7/16 × 7/16 0.314 0.377 0.440 0.312 0.375 0.438 0.311 0.374 0.437 0.312 0.375 0.438 0.177 0.213 0.248 0.183 0.219 0.254 0.312 0.375 0.438 0.313 0.376 0.439 0.142 0.169 0.197 0.148 0.175 0.203 0.010 0.010 0.020 0.314 0.377 0.440 0.312 0.375 0.438 13/4 2 2 21/2 21/2 3 1/2 × 1/2 5/8 × 5/8 3/4 × 3/4 0.502 0.627 0.752 0.500 0.625 0.750 0.499 0.624 0.749 0.500 0.625 0.750 0.283 0.354 0.424 0.289 0.360 0.430 0.500 0.625 0.750 0.501 0.626 0.751 0.224 0.278 0.333 0.230 0.284 0.339 0.020 0.020 0.020 0.502 0.627 0.752 0.500 0.625 0.750 © BSI 01-2000 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI © BSI 01-2000 Table 2 — Square parallel keys, keyways and keybars 1 2 3 4 5 6 7 8 9 10 11 12 13 Diameter of Shaft Over Up to and including Key size W×T Width W and Thickness T Max. Min. Keyway in shaft Width Ws Min. Max. Depth H Min. Max. Keyway in hub Width Wh Min. Max. Depth h Min. Max. 3 31/2 31/2 4 4 5 7/8 × 7/8 0.877 1 × 1 1.003 11/4 × 11/4 1.253 0.875 1.000 1.250 0.874 0.999 1.248 0.875 1.000 1.250 0.495 0.566 0.707 0.501 0.572 0.713 0.875 1.000 1.250 0.876 1.001 1.252 0.387 0.442 0.551 0.393 0.448 0.557 14 15 16 Nominal Keyway radius & key chamfer ra Bright keybar Width W and thickness T Max. Min. 0.062 0.062 0.062 0.877 1.003 1.253 0.875 1.000 1.250 5 6 11/2 × 11/2 1.504 1.500 1.498 1.500 0.848 0.854 1.500 a NOTE The key chamfer shall be the minimum to clear the keyway radius. Nominal values are given. For larger shafts see the note following Clause 5. 1.502 0.661 0.667 0.062 1.504 1.500 BS 46-1:1958 7 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BS 46-1:1958 标准分享网 www.bzfxw.com 免费下载 Table 3 — Rectangular taper keys and keyways, gib-head or plain 1 2 3 4 5 6 7 Diameter of shaft Over Up to and including 1 11/4 11/2 13/4 2 21/2 3 31/2 4 5 6 7 8 9 10 1111//24 13/4 2 21/2 3 31/2 4 5 6 7 8 9 10 11 Key size W×T 53//186 × × 11//44 7/16 × 5/16 1/2 × 5/16 5/8 × 7/16 3/4 × 1/2 7/8 × 1× 11/4 × 735///848 1131//42 2 ×1 × × 1131//84 2211//24 × × 1151//82 23/4 × 17/8 Width W Max. Min. 0.314 0.377 0.440 0.312 0.375 0.438 0.502 0.627 0.752 0.500 0.625 0.750 0.877 1.003 1.253 0.875 1.000 1.250 1.504 1.754 2.005 1.500 1.750 2.000 2.255 2.505 2.755 2.250 2.500 2.750 Key Thickness T Max. Min. 0.254 0.254 0.316 0.249 0.249 0.311 0.316 0.442 0.504 0.311 0.437 0.499 0.630 0.755 0.880 0.624 0.749 0.874 1.007 1.257 1.382 0.999 1.249 1.374 1.509 1.634 1.884 1.499 1.624 1.874 11 12 3 ×2 3.006 3.000 2.014 1.999 All dimensions are in inches 8 9 10 11 Keyway in shaft and hub Keyway in shaft Keyway in hub Width Ws Min. Max. Width Wh Min. Max. 0.311 0.374 0.437 0.312 0.375 0.438 0.312 0.375 0.438 0.313 0.376 0.439 0.499 0.624 0.749 0.500 0.625 0.750 0.500 0.625 0.750 0.501 0.626 0.751 0.874 0.999 1.248 0.875 1.000 1.250 0.875 1.000 1.250 0.876 1.001 1.252 1.498 1.748 1.998 1.500 1.750 2.000 1.500 1.750 2.000 1.502 1.752 2.002 2.248 2.498 2.748 2.250 2.500 2.750 2.250 2.500 2.750 2.252 2.502 2.752 2.998 3.000 3.000 3.002 8 © BSI 01-2000 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BS 46-1:1958 Table 3 — Rectangular taper keys and keyways, gib-head or plain All dimensions are in inches 12 13 14 15 16 17 18 19 20 21 Keyway in shaft and hub Nominal Depth in hub keyway Depth in shaft H at deep end of radius and Min. Max. keyway h key Min. Max. chamfer ra A Gib-head B C D Radius R 0.146 0.150 0.186 0.152 0.156 0.192 0.090 0.086 0.112 0.096 0.092 0.118 0.010 0.010 0.020 713///1286 779///111666 195///43126 0.3 0.3 0.4 111///111666 0.190 0.260 0.299 0.196 0.266 0.305 0.108 0.162 0.185 0.114 0.168 0.191 0.020 0.020 0.020 91/11/616 35//48 37//816 0.4 0.5 11//186 13/16 7/8 17/32 0.5 1/8 0.370 0.441 0.518 0.376 0.447 0.524 0.239 0.293 0.340 0.245 0.299 0.346 0.062 0.062 0.062 15/16 1 1115//1166 1111//42 21/32 0.6 1/8 2237//3322 0.6 0.7 11//84 0.599 0.605 0.384 0.390 0.062 19/16 15/8 11/32 0.7 1/4 0.740 0.746 0.493 0.499 0.125 113/16 2 17/32 0.8 1/4 0.818 0.824 0.539 0.545 0.125 21/16 21/4 113/32 0.8 1/4 0.897 0.905 0.581 0.589 0.125 25/16 21/2 19/16 0.9 3/8 0.975 1.114 0.983 1.122 0.628 0.738 0.636 0.746 0.187 0.187 22913/1/616 23/4 3 111115//1166 0.9 1.0 33//88 1.195 1.203 0.782 0.790 0.187 31/16 31/4 21/16 1.0 3/8 a NOTE The key chamfer shall be the minimum to clear the keyway radius. Nominal values shall be given. For plain keys Columns 17 to 21 do not apply. © BSI 01-2000 9 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BS 46-1:1958 标准分享网 www.bzfxw.com 免费下载 Table 4 — Square taper keys and keyways, gib-head or plain 1 2 Diameter of shaft Over Up to and including 1/4 1/2 1/2 3/4 3/4 1 1 11/4 11/4 11/2 11/2 13/4 3 4 5 6 7 Key size Key Width W Thickness T W×T Max. Min. Max. Min. 1/8 × 3/16 × 1/4 × 1/8 0.127 3/16 0.190 1/4 0.252 0.125 0.188 0.250 0.129 0.192 0.254 0.124 0.187 0.249 5/16 × 3/8 × 7/16 × 5/16 0.314 3/8 0.377 7/16 0.440 0.312 0.375 0.438 0.316 0.379 0.442 0.311 0.374 0.437 13/4 2 2 21/2 21/2 3 3 31/2 31/2 4 4 5 1/2 × 1/2 0.502 5/8 × 5/8 0.627 3/4 × 3/4 0.752 7/8 × 7/8 1 ×1 11/4 × 11/4 0.877 1.003 1.253 0.500 0.625 0.750 0.875 1.000 1.250 0.504 0.630 0.755 0.880 1.007 1.257 0.499 0.624 0.749 0.874 0.999 1.249 5 6 11/2 × 11/2 1.504 1.500 1.509 1.499 All dimensions are in inches 8 9 10 11 Keyway in shaft and hub Keyway in shaft Keyway in hub Width Ws Min. Max. Width Wh Min. Max. 0.124 0.125 0.125 0.126 0.187 0.188 0.188 0.189 0.249 0.250 0.250 0.251 0.311 0.374 0.437 0.312 0.375 0.438 0.312 0.375 0.438 0.313 0.376 0.439 0.499 0.624 0.749 0.874 0.999 1.248 0.500 0.625 0.750 0.875 1.000 1.250 0.500 0.625 0.750 0.875 1.000 1.250 0.501 0.626 0.751 0.876 1.001 1.252 1.498 1.500 1.500 1.502 10 © BSI 01-2000 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BS 46-1:1958 Table 4 — Square taper keys and keyways, gib-head or plain All dimensions are in inches 12 13 14 15 16 17 18 19 20 21 Keyway in shaft and hub Depth in shaft H Depth in hub at deep end of keyway h Min. Max. Min. Max. Nominal keyway radius and key chamfer ra 0.072 0.107 0.142 0.078 0.113 0.148 0.039 0.067 0.094 0.045 0.073 0.100 0.010 0.010 0.010 A 3/16 1/4 5/16 B 1/4 3/8 7/16 Gib-head C 5/32 7/32 9/32 D 0.1 0.2 0.2 Radius R 1/32 1/32 1/16 0.177 0.183 0.121 0.127 0.010 3/8 9/16 11/32 0.3 1/16 0.213 0.219 0.148 0.154 0.010 7/16 5/8 13/32 0.3 1/16 0.248 0.254 0.175 0.181 0.020 1/2 3/4 15/32 0.4 1/16 0.283 0.354 0.424 0.289 0.360 0.430 0.202 0.256 0.310 0.208 0.262 0.316 0.020 0.020 0.020 9/16 11/16 13/16 7/8 1 11/4 17/32 0.4 1/16 21/32 0.5 1/8 25/32 0.5 1/8 0.495 0.501 0.364 0.370 0.062 15/16 13/8 29/32 0.6 1/8 0.566 0.572 0.418 0.424 0.062 11/16 15/8 11/32 0.6 1/8 0.707 0.713 0.526 0.532 0.062 15/16 2 19/32 0.7 1/4 0.848 0.854 0.635 0.641 0.062 19/16 21/2 117/32 0.7 1/4 a NOTE The key chamfer shall be the minimum to clear the keyway radius. Nominal values are given. For plain keys Columns 17 to 21 do not apply. © BSI 01-2000 11 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BS 46-1:1958 标准分享网 www.bzfxw.com 免费下载 Table 5 — Woodruff keys and keyways 1 Key and cutter No. 203 303 403 204 304 404 305 405 505 406 506 606 507 607 807 608 808 1008 609 809 1009 810 1010 1210 1011 1211 812 1012 1212 2 3 Nominal fractional size of key Width 131///13862 1/16 3/32 1/8 3/32 1/8 5/32 1/8 5/32 3/16 531///31426 315///14166 315///14166 1/4 5/16 3/8 5/16 3/8 15//416 3/8 Dia. 333///888 1/2 1/2 1/2 5/8 5/8 5/8 3/4 3/4 3/4 777///888 1 1 1 111111///888 11/4 11/4 11/4 13/8 13/8 1111//22 11/2 4 5 Diameter of key Max. 0.375 0.375 0.375 A Min. 0.370 0.370 0.370 0.500 0.500 0.500 0.490 0.490 0.490 0.625 0.625 0.625 0.615 0.615 0.615 0.750 0.750 0.750 0.740 0.740 0.740 0.875 0.875 0.875 0.865 0.865 0.865 1.000 1.000 1.000 0.990 0.990 0.990 1.125 1.125 1.125 1.115 1.115 1.115 1.250 1.250 1.250 1.240 1.240 1.240 1.375 1.375 1.365 1.365 1.500 1.500 1.500 1.490 1.490 1.490 6 7 Depth of key Max. 0.171 0.171 0.171 B Min. 0.166 0.166 0.166 0.203 0.203 0.203 0.198 0.198 0.198 0.250 0.250 0.250 0.245 0.245 0.245 0.313 0.313 0.313 0.308 0.308 0.308 0.375 0.375 0.375 0.370 0.370 0.370 0.438 0.438 0.438 0.433 0.433 0.433 0.484 0.484 0.484 0.479 0.479 0.479 0.547 0.547 0.547 0.542 0.542 0.542 0.594 0.594 0.589 0.589 0.641 0.641 0.641 0.636 0.636 0.636 All dimensions are given in inches 8 9 10 11 Thickness of key C Max. Min. Width of keyway in shaft D Min. Max. 0.063 0.095 0.126 0.062 0.094 0.125 0.061 0.093 0.124 0.063 0.095 0.126 0.063 0.095 0.126 0.062 0.094 0.125 0.061 0.093 0.124 0.063 0.095 0.126 0.095 0.126 0.157 0.094 0.125 0.156 0.093 0.124 0.155 0.095 0.126 0.157 0.126 0.157 0.189 0.125 0.156 0.188 0.124 0.155 0.187 0.126 0.157 0.189 0.157 0.189 0.251 0.156 0.188 0.250 0.155 0.187 0.249 0.157 0.189 0.251 0.189 0.251 0.313 0.188 0.250 0.312 0.187 0.249 0.311 0.189 0.251 0.313 0.189 0.251 0.313 0.188 0.250 0.312 0.187 0.249 0.311 0.189 0.251 0.313 0.251 0.313 0.376 0.250 0.312 0.375 0.249 0.311 0.374 0.251 0.313 0.376 0.313 0.376 0.312 0.375 0.311 0.374 0.313 0.376 0.251 0.313 0.376 0.250 0.312 0.375 0.249 0.311 0.374 0.251 0.313 0.376 12 © BSI 01-2000 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BS 46-1:1958 Table 5 — Woodruff keys and keyways All dimensions are given in inches 12 13 14 15 16 17 18 19 20 Width of keyway in hub or boss E Depth of keyway in shaft F Depth of keyway in hub at centre line G Depth of key (optional design) H Dimension J Min. Max. Min. Max. Min. Max. Max. Min. Nom. 0.063 0.095 0.065 0.097 0.135 0.119 0.140 0.124 0.042 0.057 0.047 0.062 0.162 0.162 0.156 0.156 11//6644 0.126 0.128 0.104 0.109 0.073 0.078 0.162 0.156 1/64 0.063 0.065 0.167 0.172 0.042 0.047 0.194 0.188 3/64 0.095 0.126 0.097 0.128 0.151 0.136 0.156 0.141 0.057 0.073 0.062 0.078 0.194 0.194 0.188 0.188 33//6644 0.095 0.126 0.157 0.097 0.128 0.159 0.198 0.182 0.167 0.203 0.187 0.172 0.057 0.073 0.089 0.062 0.078 0.094 0.240 0.240 0.240 0.234 0.234 0.234 111///111666 0.126 0.157 0.189 0.128 0.159 0.191 0.246 0.230 0.214 0.251 0.235 0.219 0.073 0.089 0.104 0.078 0.094 0.109 0.303 0.303 0.303 0.297 0.297 0.297 111///111666 0.157 0.189 0.159 0.191 0.292 0.276 0.297 0.281 0.089 0.104 0.094 0.109 0.365 0.365 0.359 0.359 11//1166 0.251 0.253 0.245 0.250 0.136 0.141 0.365 0.359 1/16 0.189 0.191 0.339 0.344 0.104 0.109 0.428 0.422 1/16 0.251 0.253 0.308 0.313 0.136 0.141 0.428 0.422 1/16 0.313 0.315 0.277 0.282 0.167 0.172 0.428 0.422 1/16 0.189 0.251 0.191 0.253 0.385 0.354 0.390 0.359 0.104 0.136 0.109 0.141 0.475 0.475 0.469 0.469 55//6644 0.313 0.315 0.323 0.328 0.167 0.172 0.475 0.469 5/64 0.251 0.253 0.417 0.422 0.136 0.141 0.537 0.531 5/64 0.313 0.376 0.315 0.378 0.386 0.354 0.391 0.359 0.167 0.198 0.172 0.203 0.537 0.537 0.531 0.531 55//6644 0.313 0.376 0.315 0.378 0.433 0.402 0.438 0.407 0.167 0.198 0.172 0.203 0.584 0.584 0.578 0.578 33//3322 0.251 0.313 0.376 0.253 0.315 0.378 0.511 0.480 0.448 0.516 0.485 0.453 0.136 0.167 0.198 0.141 0.172 0.203 0.631 0.631 0.631 0.625 0.625 0.625 777///666444 NOTE For details of obsolete Woodruff key and cutter numbers reference should be made to Table 6. © BSI 01-2000 13 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BS 46-1:1958 标准分享网 www.bzfxw.com 免费下载 Table 6 — Comparison of woodruff key numbers (Whitney, British and American) NOTE This table has been prepared for reference, to help readers to substitute the new numbers (column 4) for the obsolete numbers given in columns 1, 2 and 3. It is strongly recommended that the obsolete numbers should be superseded by the key and cutter numbers designated in Table 5 of the Specification. 1 2 3 4 5 6 Nominal size of key Original Whitney cutter and key number British Standard key number (obsolete) British Standard cutter number (obsolete) British Standard key and cutter number and American cutter number Width (thickness) C Diameter A 211 — — 203 212 — — 303 213 — — 403 in. 1/16 3/32 1/8 in. 3/8 3/8 3/8 1 10 1 204 2 20 2 304 3 30 3 404 1/16 1/2 3/32 1/2 1/8 1/2 4 40 4 305 5 50 5 405 6 60 6 505 3/32 5/8 1/8 5/8 5/32 5/8 61 — — 7 70 7 8 80 8 — 406 506 3/16 5/8 1/8 3/4 5/32 3/4 9 90 9 91 — — 10 100 10 606 — 507 3/16 3/4 1/4 3/4 5/32 7/8 11 110 11 12 — — A 115 A 607 — 807 3/16 7/8 7/32 7/8 1/4 7/8 13 130 13 14 — — 15 150 15 608 — 808 3/16 1 7/32 1 1/4 1 B 155 B 152 — — 141 — — 1008 — — 5/16 1 3/8 1 1/4 1 16 160 16 17 — — 18 180 18 609 — 809 3/16 11/8 7/32 11/8 1/4 11/8 C 185 C 161 — — 19 — — 1009 — — 5/16 11/8 5/16 11/8 3/16 11/4 14 © BSI 01-2000 BS 46-1:1958 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI Table 6 — Comparison of woodruff key numbers (Whitney, British and American) 1 2 3 Original Whitney cutter and key number British Standard key number (obsolete) British Standard cutter number (obsolete) 4 British Standard key and cutter number and American cutter number 5 6 Nominal size of key Width (thickness) C Diameter A 20 — — 21 210 21 D 215 D — 810 1010 in. 7/32 1/4 5/16 in. 11/4 11/4 11/4 E 225 E 22 — — 23 230 23 1210 1011 3/8 11/4 1/4 13/8 5/16 13/8 F 235 F 24 240 24 25 250 25 1211 812 1012 3/8 13/8 1/4 11/2 5/16 11/2 G 255 G 126 — — 127 — — 1212 — — 3/8 11/2 3/16 21/8 1/4 21/8 128 — — — 129 — — — 26 — — — 5/16 21/8 3/8 21/8 3/16 21/8 27 — — — 28 — — — 29 — — — 1/4 21/8 5/16 21/8 3/8 21/8 RX — — — SX — — — TX — — — 1/4 23/4 5/16 23/4 3/8 23/4 Ux — — — Vx — — — R — — — 7/16 23/4 1/2 23/4 1/4 23/4 S — — — T — — — U — — — 5/16 23/4 3/8 23/4 7/16 23/4 V — — — 30 — — — 31 — — — 1/2 23/4 3/8 31/2 7/16 31/2 32 — — — 33 — — — 34 — — — 1/2 31/2 9/16 31/2 5/8 31/2 35 — — — 36 — — — 11/16 3/4 31/2 31/2 © BSI 01-2000 15 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BS 46-1:1958 标准分享网 www.bzfxw.com 免费下载 6 Dimensions of tangential keys and keyways The dimensions of tangential keys and keyways shall be as given in Table 7. The width of the key (W) is 3/10 (0.3) of the diameter of the shaft, in which case the thickness of the key (T) becomes 1/10 (0.1) of the diameter of the shaft. Tangential keys should bc provided with an extra length for driving. This should not be less than the width of the pair of keys. Table 7 — Tangential keys Diameter of shaft D 4 41/4 41/2 Width of keys W 1.200 1.275 1.350 Thickness of keys T 0.400 0.425 0.450 Diameter of shaft D 91/2 10 101/2 Width of keys W 2.850 3.000 3.150 Thickness of keys T 0.950 1.000 1.050 Diameter of shaft D 21 22 23 All dimensions are in inches Width of keys W Thickness of keys T 6.300 6.600 6.900 2.100 2.200 2.300 43/4 1.425 0.475 11 3.300 1.100 24 5 1.500 0.500 111/2 3.450 1.150 25 51/4 1.575 0.525 12 3.600 1.200 26 7.200 7.500 7.800 2.400 2.500 2.600 51/2 1.650 0.550 121/2 3.750 1.250 27 53/4 1.725 0.575 13 3.900 1.300 28 6 1.800 0.600 131/2 4.050 1.350 29 8.100 8.400 8.700 2.700 2.800 2.900 61/4 1.875 0.625 14 4.200 1.400 30 61/2 1.950 0.650 141/2 4.350 1.450 31 63/4 2.025 0.675 15 4.500 1.500 32 9.000 9.300 9.600 3.000 3.100 3.200 7 2.100 0.700 16 71/2 2.250 0.750 17 8 2.400 0.800 18 4.800 1.600 33 5.100 1.700 34 5.400 1.800 35 9.900 10.200 10.500 3.300 3.400 3.500 81/2 2.550 0.850 19 9 2.700 0.900 20 5.700 1.900 36 6.000 2.000 — 10.800 — 3.600 — The above dimensions are based on the formulae W = 0.3D and T = 0.1D but for an intermediate diameter of shaft the key section shall be the same as that for the next size larger shaft in the above list. 16 © BSI 01-2000 BS 46-1:1958 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI 7 Dimensions of keys and keyways for marine tailshafts a) General. The dimensions of keys and keyways for marine tail-shafts shall be as shown in Table 8 and Figure 2. NOTE The dimensions of keys for marine tail-shafts should be based on shaft diameters obtained by Lloyd’s rule. b) Depth at forward end. The keyway in the tailshaft shall be produced in such a manner that, at the forward end of the keyway, the total depth at the side is half the thickness of the key. c) Position on shaft. The position of the keyway in the shaft and its relation to the position of the propeller boss shall be as shown in Figure 4. d) Pull up on taper. After the propeller nut has been tightened by hand the propeller shall be pulled up on the shaft taper for a distance of 0.006 in. per inch of shaft diameter if the shaft taper is 1 in 12 and 0.008 in. per inch of shaft diameter if the shaft taper is 1 in 16. e) Sealing arrangements. Sealing arrangements at the forward and after ends of the propeller boss shall be sufficient to prevent ingress of corrosive materials to the tail-shaft under all conditions of service. Table 8 — Rectangular parallel keys for marine tailshafts Nominal diameter of shaft at after end on parallel portion under liner D inclusive 6 to 67/8 11/2 7 to 77/8 13/4 8 to 87/8 2 (All dimensions are given in inches) Nominal dimensions of key Width W Thickness T Fillet radius in keyway and chamfer on key R 1 1/16 11/8 1/8 11/4 1/8 9 to 97/8 21/4 13/8 1/8 10 to 107/8 21/2 11/2 3/16 11 to 117/8 23/4 15/8 3/16 12 to 127/8 3 13/4 3/16 13 to 137/8 31/4 17/8 3/16 14 to 147/8 31/2 2 1/4 15 to 157/8 33/4 21/8 1/4 16 to 167/8 4 21/4 1/4 17 to 177/8 41/4 23/8 5/16 18 to 187/8 41/2 21/2 5/16 19 to 197/8 43/4 25/8 5/16 20 to 207/8 5 23/4 5/16 21 to 217/8 51/4 27/8 3/8 22 to 227/8 5 1/2 3 3/8 23 to 237/8 53/4 31/8 3/8 24 to 247/8 6 31/4 7/16 25 to 257/8 61/4 33/8 7/16 26 to 267/8 61/2 31/2 7/16 27 to 277/8 63/4 35/8 7/16 28 to 287/8 7 33/4 1/2 29 to 30 71/4 37/8 1/2 © BSI 01-2000 17 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BS 46-1:1958 18 Figure 2 — Types of key and position of keyway in shaft 标准分享网 www.bzfxw.com 免费下载 © BSI 01-2000 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BS 46-1:1958 8 Keys and keyways for tapered shaft ends a) Shaft tapers. The taper on the diameter of the shaft shall be one of those listed below: 1 in 3.428 : Where a self-releasing taper is required. 1 in 4 : Generally used for locomotive piston rods, etc. 1 in 5 : Diesel engine fuel injection pumps. 1 in 8 : Popular in automobile practice; used by the Society of Motor Manufacturers and Traders and the Society of Automotive Engineers (American). 1 in 10 : General taper of decimal form. 1 in 12  and   : Alternatives used for marine shafting. 1 in 16   b) Keyways. The keyway shall lie parallel to the side of the cone. As a result of the change of section of the shaft along the cone, the depth of keyway at the sides will not be constant. This is illustrated diagrammatically in Figure 1. (BS 308, “Engineering drawing practice,” shows the recommended method of dimensioning keyways in tapered shaft ends). W = Width of key. HL = Height of key side at large end of taper. HS = Height of key side at small end of taper. KL = Depth of keyway at large end of taper. KS = Depth of keyway at small end of taper. NOTE KL decreases of KS, and HL increases to HS as the diameter of the shaft diminishes. Figure 1 — Variation in keyway depth in taper shaft c) Dimensions and tolerances. For the purpose of determining the correct size of key, the nominal diameter of the shaft shall be that of the larger end of the cone. Except in the case of marine tail shaft applications, the dimensions and tolerances of the keys and keyways for coned shafts shall be as shown in Table 1 for keys and keyways of rectangular section, Table 2 for keys and keyways of square section and Table 5 for Woodruff keys and keyways. © BSI 01-2000 19 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BS 46-1:1958 标准分享网 www.bzfxw.com 免费下载 Appendix A Preferred lengths of keys The details of the availability and preferred lengths of plain and gib-head keys, which are given in Table 9 and Table 10, have been compiled following an investigation of manufacturing records and are included for reference purposes. It should be noted that no lengths are included for a number of the key sizes which appear in Table 1, Table 2, Table 3 and Table 4, the reason being that such keys are not normally stocked, and are supplied to customer’s requirements. Table 9 — Preferred lengths of plain keys, rectangular or square section, parallel or taper All dimensions are in inches Key size Overall length L W×T 3/4 1 11/4 11/2 13/4 2 21/4 21/2 23/4 3 31/2 4 41/2 5 6 1/8 × 1/8 X X 3/16 × 3/16 X X X X X X 1/4 × 1/4 X X X X X X X X X X 5/16 × 1/4 X X X X X X X X X X 5/16 × 5/16 X X X X X X X X X X 3/8 × 1/4 XXXXXXXXXXX 3/8 × 3/8 XXXXXXXXXXX 7/16 × 5/16 XXXXXXXXX 7/16 × 7/16 XXXXXXXX 1/2 × 5/16 XXXXXXXXXX 1/2 × 1/2 XXXXXXXXX 5/8 × 7/16 XXXXXXX 5/8 × 5/8 X XXXXXX 3/4 × 1/2 XXXXXX 3/4 × 3/4 XXXXX 7/8 × 5/8 XXXXX NOTE Larger sizes than those given in this table are not generally stocked but are manufactured to customer’s individual requirements. 20 © BSI 01-2000 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BS 46-1:1958 Table 10 — Preferred lengths of gib-head keys rectangular or square section All dimensions are in inches Key size Overall length L W×T 11/2 13/4 2 21/4 21/2 23/4 3 31/2 4 41/2 5 51/2 6 61/2 7 71/2 8 3/16 × 3/16 X X X X X X 1/4 × 1/4 X X X X X X X X X 5/16 × 1/4 XXXXXXX 5/16 × 5/16 XXXXXXXX 3/8 × 1/4 XXXXXXXXX 3/8 × 3/8 XXXXXXXXXXX 7/16 × 5/16 X XXXXXXX 7/16 × 7/16 X XXXXXXX 1/2 × 5/16 X XXXXXXXX 1/2 × 1/2 X XXXXXXXX 5/8 × 7/16 X XXXXXXX 5/8 × 5/8 XXXXXXX X 3/4 × 1/2 XXXXXXXXX 3/4 × 3/4 X X X X X 7/8 × 5/8 X XXXXX 7/8 × 7/8 X X X 1 × 3/4 X XXX 1 ×1 X X X NOTE Larger or smaller sizes than those given in this table are not generally stocked but are manufactured to customer’s individual requirements. © BSI 01-2000 21 BS 46-1:1958 标准分享网 www.bzfxw.com 免费下载 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI Appendix B Approximate equivalents of metric and inch units Inches Fractional Decimal 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 0.009 0.010 1/64 0.015 6 0.020 0 0.030 1/32 0.031 3 0.040 3/64 0.046 9 0.050 0.060 1/16 0.062 5 0.070 5/64 0.078 1 0.080 0.090 3/32 0.093 8 0.100 7/64 0.109 4 0.110 0.120 1/8 0.125 0.130 0.140 9/54 0.140 6 0.150 mm 0.025 0.051 0.076 0.102 0.127 0.152 0.178 0.203 0.229 0.254 0.397 0.508 0.762 0.794 1.016 1.191 1.27 1.524 1.588 1.778 1.984 2.032 2.286 2.381 2.54 2.78 2.79 3.05 3.18 3.30 3.56 3.57 3.81 Inches Fractional Decimal 5/32 0.156 3 0.160 0.170 11/64 3/16 13/64 7/32 15/64 1/4 17/64 9/32 19/64 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4 13/16 7/8 15/16 1 0.171 9 0.180 0.187 5 0.190 0.200 0.203 1 0.218 8 0.234 4 0.250 0.265 6 0.281 3 0.296 9 0.300 0.312 5 0.375 0.400 0.437 5 0.500 0.5625 0.600 0.625 0.6875 0.700 0.750 0.800 0.812 5 0.875 0.900 0.937 5 1.00 mm 3.97 4.06 4.32 4.36 4.76 5.08 5.16 5.56 5.95 6.35 6.75 7.14 7.54 7.62 7.94 9.53 10.16 11.11 12.70 14.29 15.24 15.88 17.46 17.78 19.05 20.32 20.64 22.23 22.86 23.81 25.4 22 © BSI 01-2000 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI Inches Fractional Decimal 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 mm 50.8 76.2 101.6 127 152 178 203 229 254 279 305 330 356 381 406 432 457 483 508 533 559 584 610 635 660 686 711 737 762 787 813 838 864 889 914 © BSI 01-2000 BS 46-1:1958 23 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI 24 blank 标准分享网 www.bzfxw.com 免费下载 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI British Standards The following are available on application: CATALOGUE Including subject index and numerical list of British Standards SECTIONAL LISTS. Gratis Acoustics Aircraft materials and components Building materials and components Chemical engineering Chemicals, fats, oils, scientific apparatus, etc. Cinematography and photography Coal, coke and colliery requisites Codes of Practice Consumer goods Documentation, including Universal Decimal Classification Drawing practice Electrical engineering Farming, dairying and allied interests Furniture, bedding and furnishings Gas and solid fuel and refractories Glassware including scientific apparatus Hospital equipment Illumination and lighting fittings Industrial instruments, etc. Iron and steel Machine tools Mechanical engineering Nomenclature, symbols and abbreviations Non-ferrous metals Packaging and containers Paints, varnishes, paint materials and colours for paints Personal safety equipment Petroleum industry Plastics Printing, paper and stationery Road engineering Rubber Shipbuilding Textiles and clothing Welding BS 46-1:1958 © BSI 01-2000 Licensed Copy: London South Bank University, London South Bank University, Sun Aug 13 16:12:00 BST 2006, Uncontrolled Copy, (c) BSI BS 46-1:1958 BSI 389 Chiswick High Road London W4 4AL 标准分享网 www.bzfxw.com 免费下载 BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. 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