BSA Magneto Pinion Retaining Nut - Short Type for A, B and M Group Models
Shouldered nut to retain the mag/dyno driving pinion on A7, A10, B31, B32, B33, B34, M20 and M21 models.
Thread: 3/8" BSF - 20 TPI
Overall length: 9/16" (14.5mm)
Long type also available - see related products.
Made in England