Table 1. British Standard Whitworth (BSW) and Fine (BSF) Precision Hexagon Slotted and Castle Nuts BS 1083:1965 (obsolescent)
Bolts, Screws, and Nuts
Bolts and Screws
Nuts
Width
Thickness
Thickness
Diameter of Unthreaded Portion of Shank B
Number of Threads per Inch
Diameter of Washer Face G
Radius Under Head R
Across Flats A
Across Corners C
Head F
Ordinary E
Lock H
Nominal Size D
BSW
BSF
Max.
Min. a
Max. 0.51 0.61 0.69 0.82 0.95 1.06 1.17 1.39 1.50 1.71 1.93 2.15 2.37 2.56 2.98 3.19
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
20 18 16 14 12 12 11 10
26 22 20 18 16 16 14 12 11 10
0.445 0.438 0.525 0.518 0.600 0.592 0.710 0.702 0.820 0.812 0.920 0.912 1.010 1.000 1.200 1.190 1.300 1.288 1.480 1.468 1.670 1.640 1.860 1.815 2.050 2.005 2.220 2.175 2.580 2.520 2.760 2.700
0.428 0.418 0.025 0.015 0.2500 0.508 0.498 0.025 0.015 0.3125 0.582 0.572 0.025 0.015 0.3750 0.690 0.680 0.025 0.015 0.4375 0.800 0.790 0.025 0.015 0.5000 0.900 0.890 0.045 0.020 0.5625 0.985 0.975 0.045 0.020 0.6250 1.175 1.165 0.045 0.020 0.7500 1.273 1.263 0.065 0.040 0.8750 1.453 1.443 0.095 0.060 1.0000 1.620 1.610 0.095 0.060 1.1250 1.795 1.785 0.095 0.060 1.2500 1.985 1.975 0.095 0.060 1.3750 2.155 2.145 0.095 0.060 1.5000 2.495 2.485 0.095 0.060 1.7500 2.675 2.665 0.095 0.060 2.0000
0.2465 0.176 0.166 0.200 0.190 0.185 0.180 0.3090 0.218 0.208 0.250 0.240 0.210 0.200 0.3715 0.260 0.250 0.312 0.302 0.260 0.250 0.4335 0.302 0.292 0.375 0.365 0.275 0.265 0.4960 0.343 0.333 0.437 0.427 0.300 0.290 0.5585 0.375 0.365 0.500 0.490 0.333 0.323 0.6190 0.417 0.407 0.562 0.552 0.375 0.365 0.7440 0.500 0.480 0.687 0.677 0.458 0.448 0.8670 0.583 0.563 0.750 0.740 0.500 0.490 0.9920 0.666 0.636 0.875 0.865 0.583 0.573 1.1170 0.750 0.710 1.000 0.990 0.666 0.656 1.2420 0.830 0.790 1.125 1.105 0.750 0.730 1.3650 0.920 0.880 1.250 1.230 0.833 0.813 1.4900 1.000 0.960 1.375 1.355 0.916 0.896 1.7400 1.170 1.110 1.625 1.605 1.083 1.063 1.9900 1.330 1.270 1.750 1.730 1.166 1.146
1 ∕ 4
5 ∕ 16
3 ∕ 8
7 ∕ 16
1 ∕ 2
9 ∕ 16
5 ∕ 8 3 ∕ 4 7 ∕ 8
9 8 7 7
1
9 9
1 1 ∕ 8 1 1 ∕ 4
… 8
1 3 ∕ 8 b
6 5
8 7 7
1 1 ∕ 2 1 3 ∕ 4
2
4.5
a When bolts from 1 ⁄
4 to 1 inch are hot forged, the tolerance on the width across flats shall be two and a half times the tolerance shown in the table and shall be
unilaterally minus from maximum size. For dimensional notation, see diagram on page 1759. b Noted standard with BSW thread. All dimensions in inches except where otherwise noted.
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