T-SLOTS, BOLTS, AND NUTS Table 1. American National Standard T-Slots ANSI/ASME B5.1M-1985 (R2014)
T-SLOTS
W 1
45°
A 1
D 1
U 1
R 1
B 1
C 1
Suggested Approximate Dimensions for Rounding or Breaking of Corners
Basic Dimensions
Width of Headspace B 1
Depth of Headspace C 1
Depth of Throat D 1
Rounding or Breaking of Corners c
Nominal T-Bolt Size a
Width of Throat A 1 b
inch
mm
inch
mm
inch
mm
inch
mm
R 1 Max.
W 1 Max.
U 1 Max.
R 1 Max.
W 1 Max.
U 1 Max.
inch mm inch mm Min.
Max.
Man.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
4 5
5 6
10 11
11
3 5 7 7 8 9
3.5
4.5
7 8
0.5 0.5
0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 1.5 1.5 1.5 2.5 2.5
0.8 0.8 0.8 0.8 0.8 0.8 1.3 1.3 1.3 1.3 1.3
12.5
6 8 8 9
5 7 9
0.250 0.312
6 0.282
8 0.500 0.562 14.5 16
0.203 0.234 0.234 0.266 0.297 0.328 0.359 0.391
0.125 0.375 0.156 0.438
11 14 17 19 24 29 36 46 53 59 66
0.02 0.02 0.03 0.5 0.02 0.03 0.03 0.5 0.02 0.03 0.03 0.5 0.02 0.03 0.03 0.5 0.03 0.03 0.05 0.8 0.03 0.03 0.05 0.8 0.03 0.06 0.05 0.8 0.03 0.06 0.05 0.8 0.03 0.06 0.05 0.8
8 0.344 10 0.594 0.656 16
18 21 25 32 40 50 60 72 85 95
0.375 10 0.438 12 0.719 0.781 19 0.500 12 0.562 14 0.906 0.969 23 0.625 16 0.688 18 1.188 1.250 30 0.750 20 0.812 22 1.375 1.469 37 1.000 24 1.062 28 1.750 1.844 46 1.250 30 1.312 36 2.125 2.219 56 1.500 36 1.562 42 2.562 2.656 68
0.219 0.562 11 0.312 0.688 12 0.438 0.875 16 0.562 1.062 20 0.750 1.250 26 1.000 1.562 33 1.250 1.938 39
11 14 18 22 28 35 40 44
0.453 0.484 12 0.594 0.625 16 0.781 0.828 20 1.031 1.094 25 1.281 1.344 32
42 48
48 54
80 90
36 40
44 50
1.5 1.5
2 2
a Width of tongue (tenon) to be used with the above T-Slots will be found in the complete standard, B5.1M. b 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 (see page 665 ). c Corners of T-Slots may be square or may be rounded or broken to the indicated maximum dimensions at the manufacturer’s option. For the dimensions of tongue seats, inserted tongues, and solid tongues refer to the complete standard, B5.1M.
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