3/4" (12B) British Standard pitch sprockets. Manufactured in Steel EN8, 080M40/080M46, C45
12B-1 21T Steel Sprocket (6SR21)
12B-1 21T Steel Sprocket (6SR21)
| Part No. | 7825-331 |
| Code | 6SR21 |
| No. teeth | 21 |
| Outside dia. de | 136 |
| Pitch dia. dp | 127.82 |
| Boss dia. | 90 |
| Bore D1* | 20 |
| Overall Width A | 40 |
Every effort is taken to ensure the accuracy of the table data
Design variations and errors although rare may occur