Lock Nut as fitted to 500cc, 650cc & 750cc Triumph Twins & Triples. Rear Brake Drums to Hubs and Mudguards Stays to Mudguards. Also used as BSA A10 Conrod Nuts.
Thread: 5/16" CEI
MADE IN ENGLANDĀ
OEM: 37-1691, W1691, 67-1537, 68-0065