BS 6487 Split Pin Holes and Wire Holes
BS 6487 specifies recommended dimensions and positions for split-pin holes and wire holes in bolts, screws and studs, unless the product standard states otherwise.
BS 6487 hole dimensions
Split-pin holes
| Thread d (mm) | Hole d1 H14 (mm) | Minimum end distance le (mm) |
|---|---|---|
| 4 | 1 | 2.3 |
| 5 | 1.2 | 2.6 |
| 6 | 1.6 | 3.3 |
| 7 | 1.6 | 3.3 |
| 8 | 2 | 3.9 |
| 10 | 2.5 | 4.9 |
| 12 | 3.2 | 5.9 |
| 14 | 3.2 | 6.5 |
| 16 | 4 | 7 |
| 18 | 4 | 7.7 |
| 20 | 4 | 7.7 |
| 22 | 5 | 8.7 |
| 24 | 5 | 10 |
| 27 | 5 | 10 |
| 30 | 6.3 | 11.2 |
| 33 | 6.3 | 11.2 |
| 36 | 6.3 | 12.5 |
| 39 | 6.3 | 12.5 |
| 42 | 8 | 14.7 |
| 45 | 8 | 14.7 |
| 48 | 8 | 16 |
| 52 | 8 | 16 |
Wire holes
| Thread d (mm) | Hole d1 H14 (mm) |
|---|---|
| 4 | 1.2 |
| 5 | 1.2 |
| 6 | 1.6 |
| 7 | 1.6 |
| 8 | 2 |
| 10 | 2 |
| 12 | 2 |
| 14 | 2 |
| 16 | 3 |
| 18 | 3 |
| 20 | 3 |
| 22 | 3 |
| 24 | 3 |
| 27 | 3 |
| 30 | 3 |
| 33 | 4 |
| 36 | 4 |
| 39 | 4 |
| 42 | 4 |
| 45 | 4 |
| 48 | 4 |
| 52 | 5 |
Reference note: All dimensions are in millimetres. The longitudinal position of a split-pin hole is selected for the application, subject to the specified minimum end distance after accounting for tolerances. Product-grade tolerances apply.