D EUTSCHE NORM
January 2000
Square weld nuts
{
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.
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 Stand-
ards (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.
Normen-Download-Beuth-Lear Corporation GmbH & Co. KG-KdNr.4959577-LfNr.2733724001-2005-03-15 12:15
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
General purpose ISO metric screw threads – Nominal sizes for 1,5 mm fine pitch threads
with diameters from 12 mm to 300 mm
DIN 13-15
ISO metric screw threads – Fundamental deviations and tolerances for screw threads of
1 mm diameter and larger
DIN 267-2
Fasteners – Technical delivery conditions – Product grades and tolerances
DIN 929
Hexagon weld nuts
DIN 977
Hexagon weld nuts with flange
DIN 4000-2
Tabular layouts of article characteristics for bolts, screws and fit bolts
DIN EN 20898-2
Mechanical properties of fasteners – Part 2: Nuts with coarse pitch thread and specified
proof load values (ISO 898-2 : 1992)
DIN EN ISO 898-1
Mechanical properties of fasteners made of carbon steel and alloy steel – Part 1: Bolts,
screws and studs (ISO 898-1 : 1999)
DIN EN ISO 898-6
Mechanical properties of fasteners – Part 6: Nuts with fine pitch thread and specified
proof load values (ISO 898-6 : 1994)
DIN EN ISO 3269
Fasteners – Acceptance inspection (ISO/DIS 3269 : 1998)*)
DIN EN ISO 4042
Fasteners – Electroplated coatings (ISO 4042 : 1999)
DIN EN ISO 4759-1 Tolerances for fasteners – Part 1: Bolts, screws, studs and fit bolts – Product grades A,
B and C (ISO/DIS 4759-1 : 1997)*)
ISO 8992 : 1986
Fasteners – General requirements for bolts, screws, studs and fit bolts
ANSI B1.1-1989
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
Normen-Download-Beuth-Lear Corporation GmbH & Co. KG-KdNr.4959577-LfNr.2733724001-2005-03-15 12:15
Figure 1: Nut dimensions
(notation)
*) Currently at draft stage.
1
) Obtainable from
Beuth Verlag GmbH (Auslandsnormen-Service),
10772 Berlin, Germany.
Page 3
DIN 928 : 2000-01
Table 1: Nut dimensions
Thread size
d
1
M4
M5
M6
M8
M10
–
–
M12
(M14)
(M16)
–
–
–
M8 × 1
M10 × 1,25
–
–
M12 × 1,25
(M14 × 1,5)
(M16 × 1,5)
d
1
×
P
1
)
–
–
–
–
M10 × 1
7/16-20 UNF-2B
2
)
7/16-20 UNF-2B
2
)
M12 × 1,5
–
–
0,8
1
1,2
1,5
1,8
1,8
2
2
2,5
2,5
± 0,2
± 0,15
b
Limit de-
viations
d
2
H13
5
6
7,5
10
12,5
12,5
13,5
13,5
16,8
18,8
d
3
Max.
4,2
5,25
6,3
8,4
10,5
11,7
11,7
12,6
14,7
16,8
d
4
Min.
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
h
1
± 0,1
0,6
0,8
0,8
1
1,2
1,2
1,4
1,4
1,4
1,6
Thread size
d
1
M4
M5
M6
M8
M10
Normen-Download-Beuth-Lear Corporation GmbH & Co. KG-KdNr.4959577-LfNr.2733724001-2005-03-15 12:15
h
2
Min.
–
–
–
–
M10 × 1
0,4
0,6
0,7
1,1
1,25
1,25
1,75
1,75
1,75
2,0
Max.
1,3
1,5
1,8
2,0
2,2
2,2
3,0
3,0
3,2
4,0
m
h14
3,5
4,2
5
6,5
8
9
9
9,5
11,4
13
s
h14
7
9
10
14
17
17
19
19
22
24
d
1
×
P
1
)
–
–
–
M8 × 1
M10 × 1,25
–
–
M12 × 1,25
(M14 × 1,5)
(M16 × 1,5)
Approx. mass, in kg,
per 1000 units
0,81
1,7
2,4
6,5
11,3
12,5
16,5
16,6
26,7
35,8
–
–
M12
(M14)
(M16)
7/16-20 UNF-2B
2
)
7/16-20 UNF-2B
2
)
M12 × 1,5
–
–
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.
4
4.1
Technical delivery conditions
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.
Table 2: Proof loads
Coarse thread
(size)
M4
M5
M6
M8
M10
–
–
M12
–
M14
M16
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
4.5
Surface finish
As a rule, square weld nuts are to be supplied uncoated. Electroplated coatings shall comply with the speci-
fications 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.
Normen-Download-Beuth-Lear Corporation GmbH & Co. KG-KdNr.4959577-LfNr.2733724001-2005-03-15 12:15
4.6
Acceptance inspection
Acceptance inspection shall comply with the specifications given in DIN EN ISO 3269.
5
Designation
Nut DIN 928 – M10 – St
Designation of a size M10 square weld nut made of steel (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.
Page 5
DIN 928 : 2000-01
7
Indication on drawings
Figure 2: Indication on drawings
8
Connecting dimensions
Figure 3: Connecting dimensions
(nut not welded on)
Table 3: Connecting dimensions
Normen-Download-Beuth-Lear Corporation GmbH & Co. KG-KdNr.4959577-LfNr.2733724001-2005-03-15 12:15
Thread size as in table 1
d
1
M4
M5
M6
M8
M10
–
M12
M14
M16
1
)
Plate thickness,
a
Min.
–
–
–
–
M10 × 1
0,75
0,88
0,88
1
1,25
1,25
1,5
2
2
Max.
1,5
2
2,5
3
4
4
5
6
6
Hole diameter,
d
51
)
(H11)
6
7
8
10,5
12,5
13,5
14,8
16,8
18,8
d
1
×
P
–
–
–
M8 × 1
M10 × 1,25
–
M12 × 1,25
M14 × 1,5
M16 × 1,5
7/16-20 UNF-2B
M12 × 1,5
–
–
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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