5/16 Internal Tooth Lock Washer Black Zinc and Bake M10-1.50 which means they are suitable

which means they are suitable for use in structural applications where high strength is required

This lock nut is ideal for use in a variety of applications

They meet ASTM standards for quality and durability

It is made from steel and has a zinc coating for corrosion resistance

while the 3/8" center hole accommodates bolts or screws

5/16 Internal Tooth Lock Washer Black Zinc and Bake M10-1.50 which means they are suitable**5 16 Internal Tooth Lock Washer Black Zinc and Bake** These 5 16" internal tooth lock washers are made of durable steel and feature a black zinc and bake finish for corrosion resistance. They are designed to prevent nuts and bolts from loosening due to vibration or movement. The internal teeth bite into the mating surface, creating a secure hold. These washers are ideal for use in automotive, industrial, and construction applications. **Features:**