| 12B1 British Standard pilot bore sprocket |

| Attribute | Value |
|---|---|
| Boss Dia | 58 |
| Outside Dia | 87.5 |
| Number of Teeth | 13 |
| Pitch | 3/4 |
| Overall Length | 35 |
| Pilot Bore Size | 14 |
Disclaimer: Should a manufacturer of a given part not be available then a direct equivalent from an alternative manufacturer will be supplied.