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Dimension Table for T-Slots, Bolts, and Nuts Table Chart
Engineering Hardware Standards
Dimension Table for T-Slots, Bolts, and Nuts per. American National Standard T-Slots ANSI/ASME B5.1M-1985.
1. Width of tongue used with the T-Slots will be found in the complete standard, B5.1M.
2. Throat dimensions are basic. When slots are intended to be used for holding only, tolerances can be 0.0 + 0.010 inch or H12 Metric (ISO/R286); when intended for location, tolerance can be 0.0 + 0.001 inch or H8 Metric.
3. Corners of T-Slots may be square or may be rounded or broken to the indicated maximum dimensions at the manufacturer's option.
Basic |
![]() Suggested Dimensional Design |
T-Slots, Bolts, and Nuts per. American National Standard T-Slots ANSI/ASME B5.1M-1985
Nominal T-Bolt Size See Note 1 |
Width of Throat A1 See Note 2 |
Width of Headspace B2 |
Depth of Headspace C1 |
||||||||
inch |
mm |
inch |
mm |
||||||||
inch |
mm |
inch |
mm |
min |
max |
min |
max |
min |
max |
min |
max |
- | 4 |
- |
5 |
- |
- | 10 |
11 |
- |
- | 3 |
3.5 |
- |
5 |
- |
6 |
- |
- | 11 |
12.5 |
- |
- |
5 |
6 |
0.250 | 6 |
0.282 |
8 |
0.500 |
0.562 |
14.5 |
16 |
0.203 |
0.234 |
7 |
8 |
0.312 | 8 |
0.344 |
10 |
0.594 |
0.656 | 16 |
18 |
0.234 |
0.266 |
7 |
8 |
0.375 | 10 |
0.438 |
12 |
0.719 |
0.781 | 19 |
21 |
0.297 |
0.328 |
8 |
9 |
0.500 | 12 |
0.562 |
14 |
0.906 |
0.969 | 23 |
25 |
0.359 |
0.391 |
9 |
11 |
0.625 | 16 |
0.688 |
18 |
1.188 |
1.250 | 30 |
32 |
0.453 |
0.484 |
12 |
14 |
0.750 | 20 |
0.812 |
22 |
1.375 |
1.469 | 37 |
40 |
0.594 |
0.625 |
16 |
18 |
1.000 | 24 |
1.062 |
28 |
1.750 |
1.844 | 46 |
50 |
0.781 |
0.828 |
20 |
22 |
1.250 | 30 |
1.312 |
36 |
2.125 |
2.219 | 56 |
60 |
1.031 |
1.094 |
25 |
28 |
1.500 | 36 |
1.562 |
42 |
2.562 |
2.656 | 68 |
72 |
1.281 |
1.344 |
32 |
35 |
- | 42 |
- |
48 |
- |
- | 80 |
85 |
- |
- |
36 |
40 |
- | 48 |
- |
54 |
- |
- | 90 |
95 |
- |
- |
40 |
44 |
Nominal T-Bolt Size See Note 1 |
Depth of Throat D1 |
Round or Breakoken Corners See Note 3 |
||||||||||
inch |
mm |
inch |
mm |
|||||||||
inch |
mm |
min |
max |
min |
max |
R1 max |
W1 max |
U1 max |
R1 max |
W1 max |
U1 x |
|
- |
4 |
- |
- |
4.5 |
7 |
- |
- |
- |
0.5 |
0.8 |
0.8 |
|
- |
5 |
- |
- |
5 |
8 |
- |
- |
- |
0.5 |
0.8 |
0.8 |
|
0.250 |
6 |
0.125 |
0.375 |
7 |
11 |
0.02 |
0.02 |
0.03 |
0.5 |
0.8 |
0.8 |
|
0.312 |
8 |
0.156 |
0.438 |
9 |
14 |
0.02 |
0.03 |
0.03 |
0.5 |
0.8 |
0.8 |
|
0.375 |
10 |
0.219 |
0.562 |
11 |
17 |
0.02 |
0.03 |
0.03 |
0.5 |
0.8 |
0.8 |
|
0.500 |
12 |
0.312 |
0.688 |
12 |
19 |
0.02 |
0.03 |
0.03 |
0.5 |
0.8 |
0.8 |
|
0.625 |
16 |
0.438 |
0.875 |
16 |
24 |
0.03 |
0.03 |
0.05 |
0.8 |
0.8 |
1.3 |
|
0.750 |
20 |
0.562 |
1.062 |
20 |
29 |
0.03 |
0.03 |
0.05 |
0.8 |
0.8 |
1.3 |
|
1.000 |
24 |
0.750 |
1.250 |
26 |
36 |
0.03 |
0.06 |
0.05 |
0.8 |
1.5 |
1.3 |
|
1.250 |
30 |
1.000 |
1.562 |
33 |
46 |
0.03 |
0.06 |
0.05 |
0.8 |
1.5 |
1.3 |
|
1.500 |
36 |
1.250 |
1.938 |
39 |
53 |
0.03 |
0.06 |
0.05 |
0.8 |
1.5 |
1.3 |
|
- |
42 |
- |
- |
44 |
59 |
- |
- |
- |
1.5 |
2.5 |
2 |
|
- |
48 |
- |
- |
50 |
66 |
- |
- |
- |
1.5 |
2.5 |
2 |

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