External Tooth

External Lock Washers provide greater torsional resistance to unlocking VS internal tooth lock washers / SEM Screw.

Select Material
18-8 Stainless
ISO 7045 - Phillips w/ External Tooth Lock Washer - SEMS - All Stainless
Black Oxide
ISO 7045 - Pan - Phillips - External Tooth - SEMS Machine Screws - Black Oxide
Zinc
ISO 7045 - Pan - Phillips w/ External Tooth - SEMS - Machine Screws - Zinc