BS 1804-2
BS 1804-2 covers metric parallel steel dowel pins in three grades. The selected schedule below gives nominal diameters, maximum chamfer and grade tolerance limits.
Selected diameters and tolerance limits
| Nominal D (mm) | Chamfer a max. (mm) | Grade 1 m5 (µm) upper / lower | Grade 2 h7 (µm) upper / lower | Grade 3 h11 (µm) upper / lower |
|---|---|---|---|---|
| 2 | 0.3 | +7 / +2 | 0 / -12 | 0 / -60 |
| 6 | 0.9 | +9 / +4 | 0 / -12 | 0 / -75 |
| 10 | 1.5 | +12 / +6 | 0 / -15 | 0 / -90 |
| 16 | 2.5 | +15 / +7 | 0 / -18 | 0 / -110 |
| 25 | 4 | +17 / +8 | 0 / -21 | 0 / -130 |
Length tolerance
| Nominal length L | Upper / lower deviation |
|---|---|
| Up to and including 50 mm | +0.5 / 0 mm |
| Over 50 mm | +0.8 / 0 mm |
Note: The selected values are in millimetres unless marked µm. Chamfer angle is 20°–40°. The complete standard includes additional diameter and length combinations.