Table 2. British Standard Whitworth (BSW) and Fine (BSF) Precision Hexagon Slotted and Castle Nuts BS 1083:1965 (obsolescent)
Slotted Nuts
Castle Nuts Lower Face to Bottom of Slot K
Slotted and Castle Nuts
Castellated Portion Diameter L
Lower Face to Bottom of Slot H
Number of Threads per Inch
Slots
Total Thickness J
Thickness P
Width M
Depth N
Nominal Size D
BSW
BSF
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Approx.
20 18 16 14 12 12 11 10
26 0.200 0.190 0.170 0.160 0.290 0.280 0.200 0.190 0.430 0.425 0.100 0.090 0.090 22 0.250 0.240 0.190 0.180 0.340 0.330 0.250 0.240 0.510 0.500 0.100 0.090 0.090 20 0.312 0.302 0.222 0.212 0.402 0.392 0.312 0.302 0.585 0.575 0.100 0.090 0.090 18 0.375 0.365 0.235 0.225 0.515 0.505 0.375 0.365 0.695 0.685 0.135 0.125 0.140 16 0.437 0.427 0.297 0.287 0.577 0.567 0.437 0.427 0.805 0.795 0.135 0.125 0.140 16 0.500 0.490 0.313 0.303 0.687 0.677 0.500 0.490 0.905 0.895 0.175 0.165 0.187 14 0.562 0.552 0.375 0.365 0.749 0.739 0.562 0.552 0.995 0.985 0.175 0.165 0.187 12 0.687 0.677 0.453 0.443 0.921 0.911 0.687 0.677 1.185 1.165 0.218 0.208 0.234 11 0.750 0.740 0.516 0.506 0.984 0.974 0.750 0.740 1.285 1.265 0.218 0.208 0.234 10 0.875 0.865 0.595 0.585 1.155 1.145 0.875 0.865 1.465 1.445 0.260 0.250 0.280 9 1.000 0.990 0.720 0.710 1.280 1.270 1.000 0.990 1.655 1.635 0.260 0.250 0.280 9 1.125 1.105 0.797 0.777 1.453 1.433 1.125 1.105 1.845 1.825 0.300 0.290 0.328 1.250 1.230 0.922 0.902 1.578 1.558 1.250 1.230 2.035 2.015 0.300 0.290 8 1.375 1.355 1.047 1.027 1.703 1.683 1.375 1.355 2.200 2.180 0.300 0.290 0.328 7 1.625 1.605 1.250 1.230 2.000 1.980 1.625 1.605 2.555 2.535 0.343 0.333 0.375 0.328
1 ∕
4
5 ∕
16
3 ∕
8
7 ∕
16
1 ∕
2
9 ∕
16
5 ∕ 3 ∕ 7 ∕
8 4 8
9 8 7 7 6 5
1
1 1 ∕ 1 1 ∕ 1 3 ∕ 1 1 ∕ 1 3 ∕
8 4 8 2
… 8
a
4
2 7 1.750 1.730 1.282 1.262 2.218 2.198 1.750 1.730 2.735 2.715 0.426 0.416 0.468 a Not standard with BSW thread. For widths across flats, widths across corners, and diameter of washer face see Table 1 . For dimensional notation, see diagram on page 1759. All dimensions in inches except where otherwise noted. 4.5
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