Regular Spring Back to Products Part No. Size Thread Pitch Thickness N-820 1/4″ (6mm) 20 1/4″ (6mm) N-821 3/8″ (10mm) 16 3/8″ (10mm) N-822 1/2″ (12mm) 13 3/8″ (10mm) N-823 1/2″ (12mm) 13 1/2″ (12mm) N-824 5/8″ (18mm) 11 7/16″ (11mm) N-825 3/4″ (18mm) 10 7/16″ (11mm) N-828 5/16″ (8mm) 18 3/8″ (10mm) N-829 7/8″ (22mm) 9 7/16″ (11mm) Contact us