TRIUMPH PART NUMBER 21-0594 & 57-2240. THIS NUT IS THE UNF THREAD, EARLIER BIKES HAD CEi THREADS.
TRIUMPH T120 T140 T150 T160 BONNEVILLE QUADRANT RETURN SPRING (57-0404) 57-7051
70-1574 TRIUMPH T120 T140 T150 T160 1/2" ROCKER SPRING THACKERY WASHER UK MADE
TRIUMPH T120 T140 T150 T160 ROCKER SPINDLE THRUST WASHER SET (6) 70-1575
TRIUMPH T120 T140 T150 T160 ROCKER SPINDLE THACKERAY SPRING WASHER (4) 70-1574
TRIUMPH T120 T140 T150 T160 TR6 TR7 LAYSHAFT OPEN NEEDLE ROLLER BEARING 57-1614
BSA A50 A65 TRIUMPH T120 T140 T150 T160 UNF Cylinder Base Nuts UK MADE 21-0692