Midwest Fastener 3/8 in. External Tooth Lock Washer

The Midwest Fastener external tooth lock washer is engineered to prevent nuts and bolts from loosening due to vibration and torque. Its external serrated teeth bite into the mating surfaces to provide maximum holding power and prevent backing off during heavy-duty operations. Manufactured from high-strength steel with a zinc coating, this lock washer offers reliable corrosion resistance and structural durability. It is ideal for a wide range of automotive, agricultural, industrial, and household fastening applications.