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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.

T-Slot Design

Basic
Dimensional Design

T-Slot Dimensional
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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