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Screws Index Page... Cap Screws
Notes:
All linear dimensions in milli metres
Dimensions generally to BS EN ISO 4762 BS 3643- 2 & BS 4168 (superceded)
| Nominal | Thread. | Hex Socket Size | Body diameter and Head height | Head Dia | Soc. length | ||
| Size | Pitch | Max | Min | Max | Min | ||
| J | D /H | A | K | ||||
| M3 | 0.5 | 2.50 | 3.00 | 2.86 | 5.50 | 5.20 | 1.3 |
| M4 | 0.70 | 3.00 | 4.00 | 3.82 | 7.00 | 6.64 | 2.00 |
| M5 | 0.8 | 4.00 | 5.00 | 4.82 | 8.50 | 8.14 | 2.70 |
| M6 | 1.0 | 5.00 | 6.00 | 5.82 | 10.00 | 9.64 | 3.30 |
| M8 | 1.25 | 6.00 | 8.00 | 7.78 | 13.00 | 12.57 | 4.3 |
| M10 | 1.5 | 8.00 | 10.00 | 9.78 | 16.00 | 15.57 | 5.50 |
| M12 | 1.75 | 10.00 | 12.00 | 11.73 | 18.00 | 17.57 | 6.60 |
| M16 | 2.0 | 14.00 | 16.00 | 15.73 | 24.00 | 23.48 | 8.80 |
| M20 | 2.5 | 17.00 | 20.00 | 19.67 | 30.00 | 29.48 | 10.70 |
| M24 | 3.0 | 19.00 | 24.00 | 23.67 | 36.00 | 35.38 | 12.90 |
Countersunk Screws (Flat Head Screws)
The dimensions are generally in accordance with BS EN ISO 10642:1998. This supersedes BS 4168-8.
| Nominal size | Body Dia | Thread Pitch | Hex Socket Size | Max Cone Dia | Head Dia | Head Height | Soc. length | ||
| D(max) | D(min) | J | A1 | A_max | A_Min | H | K | ||
| M3 | 3.00 | 2.86 | 0.5 | 2,0 | 6,72 | 6,00 | 5,82 | 1,86 | 1,05 |
| M4 | 4.00 | 3.82 | 0.70 | 2,5 | 8,96 | 8,00 | 7,78 | 2,48 | 1,49 |
| M5 | 5.00 | 4.82 | 0.8 | 3,0 | 11,2 | 10,00 | 9,78 | 3,1 | 1,86 |
| M6 | 6.00 | 5.82 | 1.0 | 4,0 | 13,44 | 12,00 | 11,75 | 3,72 | 2,16 |
| M8 | 8.00 | 7.78 | 1.25 | 5,0 | 17,92 | 16,00 | 15,73 | 4,96 | 2,85 |
| M10 | 10.00 | 9.78 | 1.5 | 6,0 | 22,4 | 20,00 | 19,67 | 6,2 | 3,60 |
| M12 | 12.00 | 11.73 | 1.75 | 8,0 | 26,88 | 24,00 | 23,67 | 7,44 | 4,35 |
| M16 | 16.00 | 15.73 | 2.0 | 10,0 | 33,6 | 32,00 | 29,67 | 8,8 | 4,89 |
| M20 | 20.00 | 19.67 | 2.5 | 10,0 | 40,32 | 40,00 | 35,61 | 10,16 | 5,49 |
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Screws Index Page...
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