UNI 1751 A – Spring Lock Washers, Form A
UNI 1751 A is a spring lock washer with rounded section edges. The image shows the ring and side section with the dimensions used in the table.
Selected dimensional schedule (mm)
| For thread | d1 | d2 | s | h | Approx. mass (kg/1000) |
|---|---|---|---|---|---|
| M3 | 3.2 | 5.8 | 0.8 | 1.6 | 0.10 |
| M4 | 4.3 | 7.3 | 0.9 | 1.8 | 0.17 |
| M5 | 5.3 | 8.9 | 1.2 | 2.4 | 0.33 |
| M6 | 6.4 | 11.4 | 1.6 | 3.2 | 0.74 |
| M7 | 7.4 | 12.4 | 1.6 | 3.2 | 0.80 |
| M8 | 8.4 | 14.4 | 2.0 | 4.0 | 1.40 |
| M10 | 10.5 | 17.5 | 2.2 | 4.4 | 2.14 |
| M12 | 13.0 | 21.0 | 2.5 | 5.0 | 3.24 |
| M14 | 15.0 | 24.0 | 3.0 | 6.0 | 5.25 |
| M16 | 17.0 | 27.0 | 3.5 | 7.0 | 7.88 |
| M18 | 19.0 | 29.0 | 3.5 | 7.0 | 8.50 |
| M20 | 21.0 | 33.0 | 4.0 | 8.0 | 12.9 |
| M22 | 23.0 | 35.0 | 4.0 | 8.0 | 13.7 |
| M24 | 25.0 | 39.0 | 5.0 | 10.0 | 21.3 |
| M27 | 28.0 | 42.0 | 5.0 | 10.0 | 24.1 |
| M30 | 31.0 | 47.0 | 6.0 | 12.0 | 26.8 |
| M33 | 34.0 | 54.0 | 6.0 | 12.0 | 53.0 |
| M36 | 37.0 | 57.0 | 6.0 | 12.0 | 55.9 |
| M39 | 40.0 | 60.0 | 6.0 | 12.0 | 60.0 |
Dimensions are in millimetres. The published catalogue identifies this form with rounded section edges. Masses are approximate catalogue values.
Reference schedule: Spring-washer catalogue (UNI 1751 A).