Metric Hex Jam Nuts and Heavy Hex Nuts

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

Standard Metric Hex Jam Nuts and Heavy Hex Nuts

Metric nuts are designated as following: preferably in the sequence shown: product name, nominal diameter and thread pitch, steel property class or material identification, and protective coating, if required. (Note: It is common practice in ISO Standards to omit thread pitch from the product designation when the nut threads are the metric coarse thread series, e.g., M10 stands for M10 × 1.5).

Example: Hex nut, style 1, M10 × 1.5, ASTM A563M class 10, zinc plated
Heavy hex nut, M20 × 2.5, silicon bronze, ASTM F467, grade 651
Slotted hex nut, M20, ASTM A563M class 10.

Heavy Hex and Jam Nut

Standard Metric Hex Jam Nuts and Heavy Hex Nuts
ANSI B18.2.4.5M and B18.2.4.6M

Table 31. American National Standard Metric Hex Jam Nuts and Heavy Hex Nuts ANSI B18.2.4.5M and B18.2.4.6M-1979 (R1998)

Nominal Diameter
Thread Pitch
Width
S
Width
E
Thickness
M
Bearing
Diameter
Dw
Thickness
C
Max
Min
Max
Min
Max
Min
Min
Max
Min
Metric Hex Jam Nuts
M5 × 0.8
8.00
7.78
9.24
8.79
2.70
2.45
6.9
M6 × 1
10.00
9.78
11.55
11.05
3.20
2.90
8.9
M8 × 1.25
13.00
12.73
15.01
14.38
4.00
3.70
11.6
aM10 × 1.5
15.00
14.73
17.32
16.64
5.00
4.70
13.6
M10 × 1.5
16.00
15.73
18.48
17.77
5.00
4.70
14.6
M12 × 1.75
18.00
17.73
20.78
20.03
6.00
5.70
16.6
M14 × 2
21.00
20.67
24.25
23.35
7.00
6.42
19.6
M16 × 2
24.00
23.67
27.71
26.75
8.00
7.42
22.5
M20 × 2.5
30.00
29.16
34.64
32.95
10.00
9.10
27.7
0.8
0.4
M24 × 3
36.00
35.00
41.57
39.55
12.00
10.90
33.2
0.8
0.4
M30 × 3.5
46.00
45.00
53.12
50.85
15.00
13.90
42.7
0.8
0.4
M36 × 4
55.00
53.80
63.51
60.79
18.00
16.90
51.1
0.8
0.4
Metric Heavy Hex Nuts
M12 × 1.75
21.00
20.16
24.25
22.78
12.3
11.9
19.2
0.8
0.4
M14 × 2
24.00
23.16
27.71
26.17
14.3
13.6
22.0
0.8
0.4
M16 × 2
27.00
26.16
31.18
29.56
17.1
16.4
24.9
0.8
0.4
M20 × 2.5
34.00
33.00
39.26
37.29
20.7
19.4
31.4
0.8
0.4
M22 × 2.5
36.00
35.00
41.57
39.55
23.6
22.3
33.3
0.8
0.4
M24 × 3
41.00
40.00
47.34
45.20
24.2
22.9
38.0
0.8
0.4
M27 × 3
46.00
45.00
53.12
50.85
27.6
26.3
42.8
0.8
0.4
M30 × 3.5
50.00
49.00
57.74
55.37
30.7
29.1
46.6
0.8
0.4
M36 × 4
60.00
58.80
69.28
66.44
36.6
35.0
55.9
0.8
0.4
M42 × 4.5
70.00
67.90
80.83
77.41
42.0
40.4
64.5
1.0
0.5
M48 × 5
80.00
77.60
92.38
88.46
48.0
46.4
73.7
1.0
0.5
M56 × 5.5
90.00
87.20
103.92
99.41
56.0
54.1
82.8
1.0
0.5
M64 × 6
100.00
96.80
115.47
110.35
64.0
62.1
92.0
1.0
0.5
M72 × 6
110.00
106.40
127.02
121.30
72.0
70.1
101.1
1.2
0.6
M80 × 6
120.00
116.00
138.56
132.24
80.0
78.1
110.2
1.2
0.6
M90 × 6
135.00
130.50
155.88
148.77
90.0
87.8
124.0
1.2
0.6
M100 × 6
150.00
145.00
173.21
165.30
100.0
97.8
137.8
1.2
0.6

a This size with width across flats of 15 mm is not standard. Unless specifically ordered, M10 hex jam nuts with 16 mm width across flats will be furnished.

All dimensions are in millimeters.

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