![Internal /External Tooth Lockwasher](http://www.sterlinghardware.com/cdn/shop/products/00363_450_67642c55-9184-4070-9aa3-1a106f6509ed_{width}x.jpg?v=1575439624)
Internal /External Tooth Lockwasher
Internal/External Tooth Lockwasher. A hardened circular washer with twisted prongs or teeth protuding from both the inside and outer edges of the washer. Preferred lockwasher in the collowing situations: (1) where a larger bearing surface is desired; (2) for an optimum electrical connection; (3) where the hole is oversized or out of round; (4) as an insert between two adjustable pieces where a longitudinal or rotational adjustment must be maintained. *ZB - BLUE ZINC