BS 4183 Metric Slotted Countersunk Head Machine Screws
Dimensions of Metric Slotted Countersunk Head Machine Screws
| Thread (d) | H max (BS / DIN) | H max (ISO) | D nom (DIN) | D nom (BS) | D nom (ISO) | w (slot width) nom | t (slot depth) min |
|---|---|---|---|---|---|---|---|
| M2 | 1.2 | 1.2 | 3.8 | 4.4 | 3.8 | 0.6 | 0.8 |
| M2.5 | 1.5 | 1.6 | 4.7 | 5.5 | 4.7 | 0.7 | 1 |
| M3 | 1.65 | 1.65 | 5.6 | 6.3 | 5.6 | 0.9 | 1.2 |
| M3.5 | 1.93 | 2.35 | 6.5 | 7.35 | 7.3 | 1 | 1.4 |
| M4 | 2.2 | 2.7 | 7.5 | 8.4 | 8.4 | 1.3 | 1.6 |
| M5 | 2.5 | 2.7 | 9.2 | 10 | 9.3 | 1.3 | 2 |
| M6 | 3 | 3.3 | 11 | 12 | 11.3 | 1.7 | 2.4 |
| M8 | 4 | 4.65 | 14.5 | 16 | 15.8 | 2 | 3.2 |