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BS EN ISO 4033 Hexagon nuts style 2

Engineering ANSI Hardware Design Data
Engineering Metric Hardware Design Data

BS EN ISO 4033 Hexagon nuts style 2 – product grades A and B

Example for the designation of a hexagon nut with metric thread size d = M12 and property class 9:
Hexagon nut ISO 4033 – M12 – 9

All dimensions are in millimeters.

BS EN ISO 4033 Hexagon nuts style 2 – product grades A and B

BS EN ISO 4033 Hex Nuts Table 1 Preferred sizes Dimensions in mm

Thread size, d
M5
M6
M8
M10
M12
(M14)
M16
M20
M24
M30
M36
Pa
0.8
1
1.25
1.5
1.75
2
2
2.5
3
3.5
4
c
max.
0.5
0.5
0.6
0.6
0.6
0.6
0.8
0.8
0.8
0.8
0.8
da
min.
5
6
8
10
12
14
16
20
24
30
36
max.
5.75
6.75
8.75
10.8
13
15.1
17.3
21.6
25.9
32.4
28.9
dw
min.
6.9
8.9
11.6
14.6
16.6
19.6
22.5
27.7
33.2
42.7
51.1
e
min.
8.79
11.05
14.38
17.77
20.03
23.35
26.75
32.95
39.55
50.85
60.79
m
max.
5.1
5.7
7.5
9.3
12
14.1
16.4
20.3
23.9
28.6
34.7
min.
4.8
5.4
7.14
8.94
11.57
13.4
15.7
19
22.6
27.3
33.1
m'
min.
3.84
4.32
5.71
7.15
9.26
10.7
12.6
15.2
18.1
21.8
26.5
s
max.
8
10
13
16
18
21
24
30
36
46
55
min.
7.78
9.78
12.73
15.73
17.73
20.67
23.67
29.16
35
45
53.8

Sizes in brackets should be avoided.

 

Nominal thread diameter
(mm)
Width across flats
(mm)
Annular bearing area
Thread stress area *
5
8
1.08
6
10
1.44
8
13
1.23
10
15
0.90
16
1.30
17
1.73
12
18
0.91
19
1.16
14
21
0.96
22
1.24
16
24
1.02
20
30
0.95
24
36
0.86
30
46
1.02
36
55
1.04

* Calculation based on clearance holes ISO 273 (revised), medium series.

BS EN ISO 4033 Table 2

Thread size, d
M10
M12
M14
P a
1.5
1.75
2
dw
min.
13.6
15.6
17.4
20.4
e
min.
16.64
18.90
21.10
24.49
m
max.
10
8.8
11.3
13.13
min.
9.64
8.44
10.87
12.7
m'
min.
7.7
6.75
8.7
10.2
s
max.
15
17
19
22
min.
14.73
16.73
18.67
21.67

a P = pitch of the thread.

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