ISO 1234 split pins (or “spring pins” or “ cotter pins”) are made from bent metal wire, forming a pin structure with a forked end. During installation, the split pin is inserted through a pre-drilled hole, and the forked end is bent open to securely fix it in the hole, thereby preventing nuts, bolts, or other fasteners from accidentally loosening or falling off.
ISO 1234 Dimensions
Equivalent standards: DIN 94; GB/T 91; CSN 021781; PN 82001; UNI 1336; NF E25-774.
| size (mm) | d max | d min | a max | a min | c max | c min |
|---|---|---|---|---|---|---|
| Φ0.6 | 0.5 | 0.4 | 1.6 | 0.8 | 1.0 | 0.9 |
| Φ0.8 | 0.7 | 0.6 | 1.6 | 0.8 | 1.4 | 1.2 |
| Φ1 | 0.9 | 0.8 | 1.6 | 0.8 | 1.8 | 1.6 |
| Φ1.2 | 1.0 | 0.9 | 2.5 | 1.25 | 2.0 | 1.7 |
| Φ1.6 | 1.4 | 1.3 | 2.5 | 1.25 | 2.8 | 2.4 |
| Φ2 | 1.8 | 1.7 | 2.5 | 1.25 | 3.6 | 3.2 |
| Φ2.5 | 2.3 | 2.1 | 2.5 | 1.25 | 4.6 | 4.0 |
| Φ3.2 | 2.9 | 2.7 | 3.2 | 1.6 | 5.8 | 5.1 |
| Φ4 | 3.7 | 3.5 | 4.0 | 2.0 | 7.4 | 6.5 |
| Φ5 | 4.6 | 4.4 | 4.0 | 2.0 | 9.2 | 8.0 |
| Φ6.3 | 5.9 | 5.7 | 4.0 | 2.0 | 11.8 | 10.3 |
| Φ8 | 7.5 | 7.3 | 4.0 | 2.0 | 15.0 | 13.1 |
| Φ10 | 9.5 | 9.3 | 6.3 | 3.15 | 19.0 | 16.6 |
| Φ13 | 12.4 | 12.1 | 6.3 | 3.15 | 24.8 | 21.7 |
| Φ16 | 15.4 | 15.1 | 6.3 | 3.15 | 30.8 | 27.0 |
| Φ20 | 19.3 | 19.0 | 6.3 | 3.15 | 38.5 | 33.8 |
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