BS 916 Hexagon Nut
BS 916 Hexagon Nut
| Nominal size D |
Number of threads per inch |
Width across flats A |
Approx. max. width across corners C |
Thickness of nut E |
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|---|---|---|---|---|---|---|---|---|---|---|
| Black | Faced one side | |||||||||
| B.S.W | B.S.F | max. | min. | Hexagon. | square. | max. | min. | max. | ||
| in. | in. | in. | in. | in. | in. | in. | in. | |||
| ¼ | 20 | 26 | 0.445 | 0.435 | 0.51 | 0.63 | 0.220 | 0.200 | 0.200 | |
| ⁵⁄₁₆ | 18 | 22 | 0.525 | 0.515 | 0.61 | 0.74 | 0.270 | 0.250 | 0.250 | |
| ⅜ | 16 | 20 | 0.600 | 0.585 | 0.69 | 0.85 | 0.332 | 0.312 | 0.312 | |
| ⁷⁄₁₆ | 14 | 18 | 0.710 | 0.695 | 0.82 | 1.00 | 0.395 | 0.375 | 0.375 | |
| ½ | 12 | 16 | 0.820 | 0.800 | 0.95 | 1.16 | 0.467 | 0.437 | 0.437 | |
| ⁹⁄₁₆ | 12 | 16 | 0.920 | 0.900 | 1.06 | 1.30 | 0.530 | 0.500 | 0.500 | |
| ⅝ | 11 | 14 | 1.010 | 0.985 | 1.17 | 1.43 | 0.602 | 0.562 | 0.562 | |
| ¾ | 10 | 12 | 1.200 | 1.175 | 1.39 | 1.70 | 0.728 | 0.687 | 0.687 | |
| ⅞ | 9 | 11 | 1.300 | 1.270 | 1.50 | 1.84 | 0.810 | 0.750 | 0.750 | |
| 1 | 8 | 10 | 1.480 | 1.450 | 1.71 | 2.09 | 0.935 | 0.875 | 0.875 | |
| 1⅛ | 7 | 9 | 1.670 | 1.640 | 1.93 | 2.36 | 1.060 | 1.000 | 1.000 | |
| 1¼ | 7 | 9 | 1.860 | 1.815 | 215 | 2.63 | 1.205 | 1.125 | 1.125 | |
| 1⅜a | 6 | 8 | 2.050 | 2.005 | 2.37 | 2.90 | 1.330 | 1.250 | 1.250 | |
| 1½ | 6 | 8 | 2.220 | 2.175 | 2.56 | 3.14 | 1.455 | 1.375 | 1.375 | |
| 1⅝a | 5 | 8 | 2.410 | 2.365 | 2.78 | 3.41 | 1.580 | 1.500 | 1.500 | |
| 1¾ | 5 | 7 | 2.580 | 2.520 | 2.98 | 3.65 | 1.725 | 1.625 | 1.625 | |
| 2 | 4.5 | 7 | 2.760 | 2.700 | 3.19 | 3.90 | 1.850 | 1.750 | 1.750 | |
| 2¼ | 4 | 6 | 3.150 | 3.090 | 3.64 | 4.45 | 1.975 | 1.875 | 1.875 | |
| 2½ | 4 | 6 | 3.550 | 3.490 | 4.10 | 5.02 | 2.225 | 2.125 | 2.125 | |
| 2¾ | 3.5 | 6 | 3.830 | 3.830 | 4.49 | 5.50 | 2.475 | 2.375 | 2.375 | |
| 3 | 3.5 | 5 | 4.180 | 4.080 | 4.83 | 5.91 | 2.775 | 2.625 | 2.625 | |
| 3¼a | 3.25 | 5 | 4.530 | 4.430 | 5.23 | 6.41 | 3.025 | 2.875 | 2.875 | |
| 3½ | 3.25 | 4.5 | 4.850 | 4.750 | 5.60 | 6.86 | 3.275 | 3.125 | 3.125 | |
| 3¾a | 3 | 4.5 | 5.180 | 5.080 | 5.98 | 7.33 | 3.525 | 3.375 | 3.375 | |
| 4 | 3 | 4.5 | 5.550 | 5.450 | 6.41 | 7.85 | 3.775 | 3.625 | 3.625 | |
| 4½ | 2.875 | 4 | 6.380 | 6.255 | 7.37 | 9.02 | 4.200 | 4.000 | 4.000 | |
| 5 | 2.750 | 4 | 7.300 | 7.175 | 8.43 | 10.32 | 4.700 | 4.500 | 4.500 | |
| 5½ | 2.625 | 4 | 8.350 | 8.225 | 9.64 | 11.81 | 5.200 | 5.000 | 5.000 | |
| 6 | 2.500 | 4 | 9.450 | 9.325 | 10.91 | 13.36 | 5.700 | 5.500 | 5.500 | |
| a To be dispensed with wherever possible. The dimensions of black lock nuts in the above table are designed to permit the product to be manufactured by either hot forging. cold forming or cold pressing, at the option of the manufacturer. |
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