For sale is a new BSA primary chain adjuster bolt nut. This nut is used to lock the primary chain adjusting bolt on all BSA A50 and A65 unit twins (Lightning, Royal Star, Thunderbolt, Hornet, etc) from 1962-1972. Measures 7/16"BSF x 18 TPI. Check your parts book to ensure the best fitment.
**Features**
- Zinc plated
- Made in England
- O.E.M. part number is 68-0237
- Free shipping in the USA