BS 4190 Standard
Dimensions of ISO metric hexagon nuts and hexagon thin nuts
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominal size and thread diameter | Pitch of thread (coarse pitch series) | Width across flats s |
Width across corners e |
Thickness of nut m |
Thickness of thin nut (faced both sides) t |
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| Black | Faced one side | ||||||||||
| max. | min. | max. | min. | max. | min. | max. | min. | max. | min. | ||
| M5 | 0.8 | 8.00 | 7.64 | 9.20 | 8.63 | 4.375 | 3.625 | 4.0 | 3.52 | — | — |
| M6 | 1 | 10.00 | 9.64 | 11.50 | 10.89 | 5.375 | 4.625 | 5.00 | 4.52 | — | — |
| M8 | 1.25 | 13.00 | 12.57 | 15.00 | 14.20 | 6.875 | 6.125 | 6.50 | 5.92 | 5.00 | 4.52 |
| M10 | 1.5 | 17.00 | 16.57 | 19.60 | 18.72 | 8.45 | 7.55 | 8.00 | 7.42 | 6.00 | 5.52 |
| M12 | 1.75 | 19.00 | 18.48 | 21.90 | 20.88 | 10.45 | 9.55 | 10.00 | 9.42 | 7.00 | 6.42 |
| M16 | 2 | 24.00 | 23.16 | 27.70 | 26.17 | 13.55 | 12.45 | 13.00 | 12.30 | 9.00 | 8.42 |
| M20 | 2.5 | 30.00 | 29.16 | 34.60 | 32.95 | 16.55 | 15.45 | 16.00 | 15.30 | 9.00 | 8.42 |
| (M22) | 2.5 | 32.00 | 31.00 | 36.90 | 35.03 | 18.55 | 17.45 | 18.00 | 17.30 | 10.00 | 9.42 |
| M24 | 3 | 36.00 | 35.00 | 41.60 | 39.55 | 19.65 | 18.35 | 19.00 | 18.16 | 10.00 | 9.42 |
| (M27) | 3 | 41.00 | 40.00 | 47.30 | 45.20 | 22.65 | 21.35 | 22.00 | 21.16 | 12.00 | 11.30 |
| M30 | 3.5 | 46.00 | 45.00 | 53.10 | 50.85 | 24.65 | 23.35 | 24.00 | 23.16 | 12.00 | 11.30 |
| (M33) | 3.5 | 50.00 | 49.00 | 57.70 | 55.37 | 26.65 | 25.35 | 26.00 | 25.16 | 14.00 | 13.30 |
| M36 | 4 | 55.00 | 53.80 | 63.50 | 60.79 | 29.65 | 28.35 | 29.00 | 28.16 | 14.00 | 13.30 |
| (M39) | 4 | 60.00 | 58.80 | 69.30 | 66.44 | 31.80 | 30.20 | 31.00 | 30.00 | 16.00 | 15.30 |
| M42 | 4.5 | 65.00 | 63.80 | 75.10 | 72.09 | 34.80 | 33.20 | 34.00 | 33.00 | 16.00 | 15.30 |
| (M45) | 4.5 | 70.00 | 68.80 | 80.80 | 77.74 | 36.80 | 35.20 | 36.00 | 35.00 | 18.00 | 17.30 |
| M48 | 5 | 75.00 | 73.80 | 86.60 | 83.39 | 38.80 | 37.20 | 38.00 | 37.00 | 18.00 | 17.30 |
| (M52) | 5 | 80.00 | 78.80 | 92.40 | 89.04 | 42.80 | 41.20 | 42.00 | 41.00 | 20.00 | 19.16 |
| M56 | 5.5 | 85.00 | 83.60 | 98.10 | 94.47 | 45.80 | 44.20 | 45.00 | 44.00 | — | — |
| (M60) | 5.5 | 90.00 | 88.60 | 103.90 | 100.12 | 48.80 | 47.20 | 48.00 | 47.00 | — | — |
| M64 | 6 | 95.00 | 93.60 | 109.70 | 105.77 | 51.95 | 50.05 | 51.00 | 49.80 | — | — |
| (M68) | 6 | 100.00 | 98.60 | 115.50 | 111.42 | 54.95 | 53.05 | 54.00 | 52.80 | — | — |
|
NOTE: Sizes shown in brackets are non-preferred. |
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