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DIN 928 standard spec

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DIN 928 standard spec for fastener 

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DEUTSCHE NORM Square weld nuts January 2000 { 928 ICS 21.060.20 Vierkant-Schweißmuttern Supersedes February 1998 edition. In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker. Normen-Download-Beuth-Lear Corporation GmbH & Co. KG-KdNr.4959577-LfNr.2733724001-2005-03-15 12:15 Foreword This standard has been prepared by Technical Committee Schrauben und Muttern mit Außenantrieb of the Normenausschuss Mechanische Verbindungselemente (Fasteners Standards Committee). In the May 1970 edition of this standard, nuts of property class 8 (‘weldable’) were specified. Since then, proof loads have been increased and new nut heights specified both in International and European Standards (cf. DIN EN 20898-2). It did not seem advisable to adapt the nut heights to those of nuts with full loadability, since weld nut mounting is largely automated. Changing the nut dimensions would thus have given rise to considerable difficulties (retooling), which would not have been offset by the advantage of a slightly higher resistance to stripping. Instead, this standard specifies steel with a maximum carbon content of 0,25 % and proof loads which are deemed sufficient for weld nuts to be used together with bolts of property classes lower than 8.8. Weld nuts with a higher loadability are specified in DIN 977. The DIN 4000-2-9.4 tabular layout of article characteristics shall apply to nuts covered in this standard. Amendments This standard differs from the February 1998 edition in that the designation of a square weld nut with UNF thread has been specified and some editorial amendments have been made. Previous editions DIN 928: 1970-05, 1983-08, 1998-02. All dimensions are in millimetres. 1 Scope This standard specifies requirements for sizes M4 to M16 coarse and fine pitch thread square weld nuts of product grade A, for use with bolts of property classes below 8.8 as specified in DIN EN ISO 898-1. 2 Normative references This standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the titles of the publications are listed below. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. DIN 13-1 DIN 13-5 General purpose ISO metric screw threads – Nominal sizes for 1 mm to 68 mm diameter coarse pitch threads General purpose ISO metric screw threads – Nominal sizes for 1 mm and 1,25 mm fine pitch threads with diameters from 7,5 mm to 200 mm Continued on pages 2 to 5. Translation by DIN-Sprachendienst. In case of doubt, the German-language original should be consulted as the authoritative text. © No part of this translation may be reproduced without the prior permission of DIN Deutsches Institut für Normung e.V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany, has the exclusive right of sale for German Standards (DIN-Normen). Ref. No. DIN 928 : 2000-01 English price group 06 Sales No. 0106 06.00 Page 2 DIN 928 : 2000-01 DIN 13-6 DIN 13-15 DIN 267-2 DIN 929 DIN 977 DIN 4000-2 DIN EN 20898-2 DIN EN ISO 898-1 DIN EN ISO 898-6 DIN EN ISO 3269 DIN EN ISO 4042 DIN EN ISO 4759-1 ISO 8992 : 1986 ANSI B1.1-1989 General purpose ISO metric screw threads – Nominal sizes for 1,5 mm fine pitch threads with diameters from 12 mm to 300 mm ISO metric screw threads – Fundamental deviations and tolerances for screw threads of 1 mm diameter and larger Fasteners – Technical delivery conditions – Product grades and tolerances Hexagon weld nuts Hexagon weld nuts with flange Tabular layouts of article characteristics for bolts, screws and fit bolts Mechanical properties of fasteners – Part 2: Nuts with coarse pitch thread and specified proof load values (ISO 898-2 : 1992) Mechanical properties of fasteners made of carbon steel and alloy steel – Part 1: Bolts, screws and studs (ISO 898-1 : 1999) Mechanical properties of fasteners – Part 6: Nuts with fine pitch thread and specified proof load values (ISO 898-6 : 1994) Fasteners – Acceptance inspection (ISO/DIS 3269 : 1998)*) Fasteners – Electroplated coatings (ISO 4042 : 1999) Tolerances for fasteners – Part 1: Bolts, screws, studs and fit bolts – Product grades A, B and C (ISO/DIS 4759-1 : 1997)*) Fasteners – General requirements for bolts, screws, studs and fit bolts Unified inch screw threads (UN and UNR thread form)1) 3 Dimensions The design shown is for illustrative purposes only, but the dimensions of nuts shall be as specified. Detail X Figure 1: Nut dimensions (notation) Normen-Download-Beuth-Lear Corporation GmbH & Co. KG-KdNr.4959577-LfNr.2733724001-2005-03-15 12:15 *) Currently at draft stage. 1) Obtainable from Beuth Verlag GmbH (Auslandsnormen-Service), 10772 Berlin, Germany. Table 1: Nut dimensions Thread size d1 d1 × P1) M4 M5 M6 M8 M10 – – M12 (M14) (M16) – – – – – – M8 × 1 – M10 × 1,25 M10 × 1 – 7/16-20 UNF-2B2) – 7/16-20 UNF-2B2) M12 × 1,25 M12 × 1,5 (M14 × 1,5) – (M16 × 1,5) – b Limit deviations 0,8 1 ± 0,15 1,2 1,5 1,8 1,8 2 ± 0,2 2 2,5 2,5 d2 H13 5 6 7,5 10 12,5 12,5 13,5 13,5 16,8 18,8 Page 3 DIN 928 : 2000-01 d3 Max. d4 Min. 4,2 5,25 6,3 8,4 10,5 11,7 11,7 12,6 14,7 16,8 6,4 8,2 9,1 12,8 15,6 15,6 17,4 17,4 20,4 22,4 e Min. 9 12 13 18 22 22 25 25 28 32 h1 ± 0,1 0,6 0,8 0,8 1 1,2 1,2 1,4 1,4 1,4 1,6 Thread size d1 d1 × P1) M4 – – h2 m s Min. Max. h14 h14 0,4 1,3 3,5 7 Approx. mass, in kg, per 1000 units 0,81 M5 – – 0,6 1,5 4,2 9 1,7 M6 – – 0,7 1,8 5 10 2,4 M8 M8 × 1 – 1,1 2,0 6,5 14 6,5 M10 M10 × 1,25 M10 × 1 1,25 2,2 8 17 11,3 – – 7/16-20 UNF-2B2) 1,25 2,2 9 17 12,5 – – 7/16-20 UNF-2B2) 1,75 3,0 9 19 16,5 M12 M12 × 1,25 M12 × 1,5 1,75 3,0 9,5 19 16,6 (M14) (M14 × 1,5) – 1,75 3,2 11,4 22 26,7 (M16) (M16 × 1,5) – 2,0 4,0 13 24 35,8 Bracketed sizes should not be used. 1) Thread pitch. 2) Thread series to ANSI B1.1; only to be used for fastening of seat belts in motor vehicles. Normen-Download-Beuth-Lear Corporation GmbH & Co. KG-KdNr.4959577-LfNr.2733724001-2005-03-15 12:15 4 Technical delivery conditions 4.1 General requirements General requirements for standardized bolts, screws, studs and nuts are specified in ISO 8992. 4.2 Material Weld nuts shall be made of steel with a maximum carbon content of 0,25 %. If a specific steel grade is required, this shall be agreed on ordering. 4.3 Design Weld nuts shall be of product grade A conforming to DIN EN ISO 4759-1 or DIN 267-2, with diameters and pitches in accordance with DIN 13-1 (coarse thread) or DIN 13-5 and DIN 13-6 (fine thread), tolerance class 6G to DIN 13-15 being permitted. Page 4 DIN 928 : 2000-01 4.4 Mechanical properties If the proof load test specified in DIN EN 20898-2 or DIN EN ISO 898-6 is carried out, the loads given in table 2 shall be used. In case of dispute, welding projections shall be removed prior to testing. Coarse thread (size) M4 M5 M6 M8 M10 – – M12 – M14 M16 Table 2: Proof loads Proof load, in N 6 800 11 000 15 500 28 300 44 800 – – 65 300 – 89 700 123 000 Fine thread (size) – – – M8 × 1 M10 × 1 M10 × 1,25 7/16-20 UNF-2B M12 × 1,25 M12 × 1,5 M14 × 1,5 M16 × 1,5 Proof load, in N – – – 30 200 50 200 47 800 53 600 72 100 68 200 97 500 132 000 Normen-Download-Beuth-Lear Corporation GmbH & Co. KG-KdNr.4959577-LfNr.2733724001-2005-03-15 12:15 4.5 Surface finish As a rule, square weld nuts are to be supplied uncoated. Electroplated coatings shall comply with the specifications given in DIN EN ISO 4042. Since uncoated weld nuts may be affected by corrosion during transit or storage, the manufacturer shall provide corrosion protection that does not impair nut weldability. 4.6 Acceptance inspection Acceptance inspection shall comply with the specifications given in DIN EN ISO 3269. 5 Designation Designation of a size M10 square weld nut made of steel (St): Nut DIN 928 – M10 – St If a square weld nut with UNF thread is to be supplied, the width across flats shall be included in the designation. EXAMPLE: Designation of a size 7/16-20 UNF-2B square weld nut, made of steel (St), with a width across flats of 17 mm (SW17): Nut DIN 928 – 7/16-20 UNF-2B – SW17 – St 6 Marking Square weld nuts of sizes M5 and above shall be imprinted with the manufacturer’s symbol. 7 Indication on drawings Page 5 DIN 928 : 2000-01 Figure 2: Indication on drawings 8 Connecting dimensions Normen-Download-Beuth-Lear Corporation GmbH & Co. KG-KdNr.4959577-LfNr.2733724001-2005-03-15 12:15 Figure 3: Connecting dimensions (nut not welded on) Table 3: Connecting dimensions Thread size as in table 1 d1 d1 × P M4 – – Plate thickness, a Min. Max. 0,75 1,5 Hole diameter, d51) (H11) 6 M5 – – 0,88 2 7 M6 – – 0,88 2,5 8 M8 M8 × 1 – 1 3 10,5 M10 M10 × 1,25 M10 × 1 1,25 4 12,5 – – 7/16-20 UNF-2B 1,25 4 13,5 M12 M12 × 1,25 M12 × 1,5 1,5 5 14,8 M14 M14 × 1,5 – 2 6 16,8 M16 M16 × 1,5 – 2 6 18,8 1) To ensure interchangeability, the hole diameters correspond to those of hexagon weld nuts as specified in DIN 929. They are, however, not design requirements, and therefore, other hole diameters are permitted.

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