Value Collection 31351 Internal Tooth Lock Washer No. 8

Product Description

The VALUE COLLECTION 31351 is a No. 8 screw size internal tooth lock washer made from Grade 2 steel with a zinc-plated finish. The internal tooth design bites into the bearing surface and fastener head to resist loosening from vibration and torque. With an inside diameter range of 0.168 to 0.176 inches and an outside diameter range of 0.325 to 0.336 inches, this washer is sized for standard No. 8 machine screws and sheet metal screws. The 0.02-inch thickness keeps the profile low in tight assemblies. Sold in a pack of 100, this washer is a standard consumable for electricians, HVAC technicians, plumbers, and general tradespeople working with panel assemblies, enclosures, and mechanical fastening applications.

Internal tooth lock washers in this size range are used across residential and light commercial applications wherever vibration or thermal cycling could cause fastener back-off. Common install scenarios include electrical panel grounding connections, motor mounting hardware, junction box covers, and HVAC equipment enclosures. The zinc plating provides corrosion resistance suitable for indoor and protected outdoor environments. This 100-piece pack is sized for job-site restocking or bench stock in service vehicles and shop inventory.

Key Features

• Internal tooth design resists loosening from vibration and rotational torque
• Grade 2 steel construction for reliable performance in standard fastening applications
• Zinc-plated finish for corrosion resistance in indoor and protected environments
• Inside diameter 0.168 to 0.176 inches fits standard No. 8 screw shanks
• Low-profile 0.02-inch thickness for use in tight or stacked assemblies
• 100-piece pack for job-site or bench-stock replenishment

Compatibility

Designed for use with No. 8 machine screws and sheet metal screws in standard fastening applications across electrical, HVAC, plumbing, and mechanical assembly work.

Installation Notes

Install the lock washer between the fastener head or nut and the bearing surface with the teeth facing the bearing surface for maximum grip. Ensure the mating surface is free of paint or debris that would prevent tooth engagement. No special tools are required beyond standard hand or power drivers. Follow applicable NEC or equipment manufacturer torque guidance for the fastener being used.