Table 2. American National Standard T-Bolts ANSI/ASME B5.1M-1985 (R2014)
Square Head
Square Head
A 2
R 2
C 2
T-BOLTS
B 2
W
2
Bolt Head Dimensions
Rounding of Corners c
Nominal T-Bolt Size and Thread A 2 a,b
Width Across Corners
Width Across Flats B 2
Height C 2
R 2
W 2
inch
metric
inch
mm
inch Max.
mm
inch
mm
inch Max.
mm inch
mm
UNC-2A
ISO d
Min.
Min.
Min.
Min.
Max.
Max.
Max. 12.7 14.1
Max.
Max.
Max.
Max.
Max.
M4 M5 M6 M8
9
8.5 9.5 12 14 17 21 27 33 42 52 63 74 84
2.5
2.1 3.6 5.6 5.6 6.6 7.6 9.6
0.3 0.3 0.5 0.5 0.5 0.5 0.8 0.8 0.8 0.8 0.8
0.5 0.5 0.8 0.8 0.8 1.5 1.5 1.5 1.5 1.5 1.5
10 13 15 18 22 28 34 43 53 64 75 85
4 6 6 7 8
0.250-20 0.312-18 0.375-16 0.500-13 0.625-11 0.750-10 1.000-8 1.250-7 1.500-6
0.469 0.438 0.562 0.531 0.688 0.656 0.875 0.844 1.125 1.094 1.312 1.281 1.688 1.656 2.062 2.031 2.500 2.469
0.663 0.796 0.972 1.238 1.591 1.856 2.387 2.917 3.536
18.4 0.156 0.141 21.2 0.188 0.172 25.5 0.250 0.234 31.1 0.312 0.297 39.6 0.406 0.391 48.1 0.531 0.500 60.8 0.688 0.656
0.02 0.02 0.02 0.02 0.03 0.03 0.03 0.03 0.03
0.03 0.03 0.03 0.06 0.06 0.06 0.06 0.06 0.06
M10 M12 M16 M20 M24 M30 M36 M42 M48
10 14 18 23 28 32 36
13.2 17.2 22.2 27.2 30.5 34.5
75
0.938 0.906
90.5 1.188 1.156
106.1 120.2
1 1
2 2
a For inch tolerances for thread diameters of bolts or studs and for threads see page 1951. b T-slots to be used with these bolts will be found in Table 1. c 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 (see page 2019 ).
Made with FlippingBook - Share PDF online