Dimensions of ASME B18.2.4.1M Metric Hex Nuts Style 1
Nominal
Nut Diameter and Thread Pitch
Width
Across Flats, S
Width
Across Corners, E
Thickness, M,
Bearing
Face Diameter, Dw, Min
Washer
Face Thickness
Max
Min
Max
Min
Max
Min
Max
Min
M1.6 x 0.35
3.20
3.02
3.70
3.41
1.30
1.05
2.3
--
--
M2 x 0.4
4.00
3.82
4.62
4.32
1.60
1.35
3.1
--
--
M2.5 x 0.45
5.00
4.82
5.77
5.45
2.00
1.75
4.1
--
--
M3 x 0.5
5.50
5.32
6.35
6.01
2.40
2.15
4.6
--
--
M3.5 x 0.6
6.00
5.82
6.93
6.58
2.80
2.55
5.1
--
--
M4 x 0.7
7.00
6.78
8.08
7.66
3.20
2.90
6.0
--
--
M5 x 0.8
8.00
7.78
9.24
8.79
4.70
4.40
7.0
--
--
M6 x 1.0
10.00
9.78
11.55
11.05
5.20
4.90
8.9
--
--
M8 x 1.25
13.00
12.73
15.01
14.38
6.80
6.44
11.6
--
--
M10 x 1.5
15.00
14.73
17.32
16.64
9.10
8.70
13.6
0.6
0.3
M10 x 1.5
16.00
15.73
18.48
17.77
8.40
8.04
14.6
--
--
M12 x 1.75
18.00
17.73
20.78
20.03
10.80
10.37
16.6
--
--
M14 x 2.0
21.00
20.67
24.25
23.36
12.80
12.10
19.4
--
--
M16 x 2.0
24.00
23.67
27.71
26.75
14.80
14.10
22.4
--
--
M20 x 2.5
30.00
29.16
34.64
32.95
18.00
16.90
27.9
0.8
0.4
M24 x 3.0
36.00
35.00
41.57
39.55
21.50
20.20
32.5
0.8
0.4
M30 x 3.5
46.00
45.00
53.12
50.85
25.60
24.30
42.5
0.8
0.4
M36 x 4.0
55.00
53.80
63.51
60.79
31.00
29.40
50.8
0.8
0.4
1.a
This size with width across flats of 15mm is not standard. Unless specifically
ordered, M10 hex nuts with 16mm width across flats will be furnished.