Standard Metric Torque Hex Nuts Size Data Table

Metric ISO Hardware Engineering Data
Inch ANSI Hardware Engineering Data
Fastener and Screw / Bolt Design, Formula & Calculations

Standard Prevailing-Torque Metric Hex Nuts Size Data Table

The following describs the three basic designs for prevailing- torque type nuts:
1) All-metalic, one-piece construction nuts which derive their prevailing-torque characteristics from controlled distortion of the nut thread and/or body.
2) Metal nuts which derive their prevailing-torque characteristics from addition or fusion of a nonmetallic insert, plug. or patch in their threads.
3) Top insert, two-piece construction nuts which derive their prevailing-torque characteristics from an insert, usually a full ring of non-metallic material, located and retained in the nut at its top surface.

Torque Nut

Standard Prevailing-Torque Metric Hex Nuts Size Data Table
Property Classes 5, 9, and 10
ANSI/ASME B18.16.3M

Nominal Diameter
Thread Pitch
Width
Flats, S
Width
Corners
E
Property Classes 5 and 10 Nuts
Property Class 9 Nuts
Property Class
Bearing Face
Diameter
Dw
Metala
Type
Top
Insert
All
Metal
Top
Insert
5 &
10 Nuts
9 Nuts
Thickness, M
Wrenching Height, M1
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Min
Min
Min
M3 × 0.5
5.50
5.32
6.35
6.01
3.10
2.65
4.50
3.90
3.10
2.65
4.50
3.90
1.4
1.4
4.6
M3.5 × 0.6
6.00
5.82
6.93
6.58
3.50
3.00
5.00
4.30
3.50
3.00
5.00
4.30
1.7
1.7
5.1
M4 × 0.7
7.00
6.78
8.08
7.66
4.00
3.50
6.00
5.30
4.00
3.50
6.00
5.30
1.9
1.9
5.9
M5 × 0.8
8.00
7.78
9.24
8.79
5.30
4.80
6.80
6.00
5.30
4.80
7.20
6.40
2.7
2.7
6.9
M6 × 1
10.00
9.78
11.55
11.05
5.90
5.40
8.00
7.20
6.70
5.40
8.50
7.70
3.0
3.0
8.9
M8 × 1.25
13.00
12.73
15.01
14.38
7.10
6.44
9.50
8.50
8.00
7.14
10.20
9.20
3.7
4.3
11.6
bM10 × 1.5
15.00
14.73
17.32
16.64
9.70
8.70
12.50
11.50
11.20
9.60
13.50
12.50
5.6
6.2
13.6
M10 × 1.5
16.00
15.73
18.48
17.77
9.00
8.04
11.90
10.90
10.50
8.94
12.80
11.80
4.8
5.6
14.6
M12 × 1.75
18.00
17.73
20.78
20.03
11.60
10.37
14.90
13.90
13.30
11.57
16.10
15.10
6.7
7.7
16.6
M14 × 2
21.00
20.67
24.25
23.35
13.20
12.10
17.00
15.80
15.40
13.40
18.30
17.10
7.8
8.9
19.6
M16 × 2
24.00
23.67
27.71
26.75
15.20
14.10
19.10
17.90
17.90
15.70
20.70
19.50
9.1
10.5
22.5
M20 × 2.5
30.00
29.16
34.64
32.95
19.00
16.90
22.80
21.50
21.80
19.00
25.10
23.80
10.9
12.7
27.7
M24 × 3
36.00
35.00
41.57
39.55
23.00
20.20
27.10
25.60
26.40
22.60
29.50
28.00
13.0
15.1
33.2
M30 × 3.5
46.00
45.00
53.12
50.85
26.90
24.30
32.60
30.60
31.80
27.30
35.60
33.60
15.7
18.2
42.7
M36 × 4
55.00
53.80
63.51
60.79
32.50
29.40
38.90
36.90
38.50
33.10
42.60
40.60
19.0
22.1
51.1

a Includes metal nuts with non-metallic inserts, plugs, or patches in their threads.
b This size with width across flats of 15 mm is not standard. Unless specifically ordered, M10 slotted hex nuts with 16 mm width across flats will be furnished. All dimensions are in millimeters.

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