BS 4464 Square Spring Washers
Basic dimensions for selected sizes
| Size | M4 | M5 | M6 | M8 | M10 | M12 | M16 | M20 | M22 | M24 | M30 | M36 |
| d1 (min/max) | 4.1-4.35 | 5.1-5.35 | 6.1-6.4 | 8.2-8.55 | 10.2-10.6 | 12.2-12.6 | 16.3-16.9 | 20.3-21.1 | 22.4-23.3 | 24.4-25.3 | 30.5-31.5 | 36.5-37.6 |
| d2 (max) | 6.95 | 8.55 | 9.6 | 12.75 | 15.9 | 17.9 | 24.3 | 30.5 | 32.7 | 35.7 | 43.9 | 52.1 |
| s (min/max) | 1.1-1.3 | 1.4-1.6 | 1.4-1.6 | 1.9-2.1 | 2.35-2.65 | 2.35-2.65 | 3.3-3.7 | 4.3-4.7 | 4.3-4.7 | 4.8-5.2 | 5.8-6.2 | 6.75-7.25 |