Standard T-Bolts Dimensions Table Chart

Engineering Hardware Standards

Standard T-Bolts ANSI/ASME B5.1M-1985 Dimensions and Tolerances Table

T-Bolt

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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