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Standard T-Bolts Dimensions Table Chart
Engineering Hardware Standards
Standard T-Bolts ANSI/ASME B5.1M-1985 Dimensions and Tolerances Table
Nominal T-Bolt Size and Thread |
Bolt Head Dimensions |
||||||||||
Width Across Flats |
Width Corners |
Height C2 | |||||||||
inch UNC-2A |
metric ISO a |
inch |
mm |
inch max |
mm max |
inch |
mm |
||||
max |
min |
max |
min |
max |
min |
max |
min | ||||
- |
M4 |
- |
- |
9 |
8.5 |
- |
12.7 |
- |
- |
2.5 |
2.1 |
- |
M5 |
- |
- |
10 |
9.5 |
- |
14.1 |
- |
- |
- |
3.6 |
0.250 - 20 |
M6 |
0.469 |
0.438 |
13 |
12 |
0.663 |
18.4 |
0.156 |
0.141 |
4 6 |
5.6 |
0.312 - 18 |
M8 |
0.562 |
0.531 |
15 |
14 |
0.796 |
21.2 |
0.188 |
0.172 |
6 |
5.6 |
0.375 - 16 |
M10 |
0.688 |
0.656 |
18 |
17 |
0.972 |
25.5 |
0.250 |
0.234 |
7 |
6.6 |
0.500 - 13 |
M12 |
0.875 |
0.844 |
22 |
21 |
1.238 |
31.1 |
0.312 |
0.297 |
8 |
7.6 |
0.625 - 11 |
M16 |
1.125 |
1.094 |
28 |
27 |
1.591 |
39.6 |
0.406 |
0.391 |
10 |
9.6 |
0.750 - 10 |
M20 |
1.312 |
1.281 |
34 |
33 |
1.856 |
48.1 |
0.531 |
0.500 |
14 |
13.2 |
1.000 - 8 |
M24 |
1.688 |
1.656 |
43 |
42 |
2.387 |
60.8 |
0.688 |
0.656 |
18 |
17.2 |
1.250 - 7 |
M30 |
2.062 |
2.031 |
53 |
52 |
2.917 |
75 |
0.938 |
0.906 |
23 |
22.2 |
1.500 - 6 |
M36 |
2.500 |
2.469 |
64 |
63 |
3.536 |
90.5 |
1.188 |
1.156 |
28 |
27.2 |
- |
M42 |
- |
- |
75 |
74 |
- |
106.1 |
- |
- |
32 |
30.5 |
- |
M48 |
- |
- |
85 |
84 |
- |
120.2 |
- |
- |
36 |
34.5 |
a. Corners of T-bolts may be square or may be rounded or broken to the indicated maximum dimensions at the manufacturer's option. d Metric thread grade and tolerance position is 5g 6g
Nominal T-Bolt Size and Thread |
Radius of Corners |
||||
R2 |
W2 |
||||
inch UNC-2A |
metric ISO a |
inch max |
mm max |
inch max |
mm max |
- |
M4 |
- |
0.3 |
- |
0.5 |
- |
M5 |
- |
0.3 |
- |
0.5 |
0.250 - 20 |
M6 |
0.02 |
0.5 |
0.03 |
0.8 |
0.312 - 18 |
M8 |
0.02 |
0.5 |
0.03 |
0.8 |
0.375 - 16 |
M10 |
0.02 |
0.5 |
0.03 |
0.8 |
0.500 - 13 |
M12 |
0.02 |
0.5 |
0.06 |
1.5 |
0.625 - 11 |
M16 |
0.03 |
0.8 |
0.06 |
1.5 |
0.750 - 10 |
M20 |
0.03 |
0.8 |
0.06 |
1.5 |
1.000 - 8 |
M24 |
0.03 |
0.8 |
0.06 |
1.5 |
1.250 - 7 |
M30 |
0.03 |
0.8 |
0.06 |
1.5 |
1.500 - 6 |
M36 |
0.03 |
0.8 |
0.06 |
1.5 |
- |
M42 |
- |
1 |
- |
2 |
- |
M48 |
- |
1 |
- |
2 |

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