Value Collection 31356 3/8 in Internal Tooth Lock Washer 100pk

Product Description

The VALUE COLLECTION 31356 is a 3/8 inch internal tooth lock washer manufactured from Grade 2 steel with a zinc-plated finish. It is designed to prevent fastener loosening caused by vibration and torque by biting into the bearing surface of the bolt head or nut during installation. The internal tooth design concentrates locking force close to the fastener shank, making it well suited for applications where outer edge clearance is limited. Each washer has a minimum inside diameter of 0.384 inches and a maximum outside diameter of 0.692 inches, with a material thickness of 0.035 inches. This item is sold in a package of 100 pieces.

Internal tooth lock washers in this size range are commonly used in residential and light commercial mechanical, electrical, and HVAC assemblies where threaded fasteners are exposed to vibration or repeated thermal cycling. Typical applications include equipment panel mounting, bracket fastening, and electrical enclosure assembly. The zinc-plated finish provides baseline corrosion resistance suitable for indoor and protected outdoor environments. These washers are a standard consumable stocked by electricians, HVAC technicians, plumbers, and general maintenance trades.

Key Features

• Internal tooth design bites into the mating surface to resist fastener back-out under vibration
• Grade 2 steel construction provides adequate strength for general mechanical fastening
• Zinc-plated finish offers corrosion resistance in indoor and protected environments
• 0.035 inch material thickness maintains a low stack height in tight assemblies
• Inside diameter range of 0.384 to 0.398 inches fits standard 3/8 inch fasteners
• Package of 100 pieces supports job-site and shop inventory stocking

Compatibility

Designed as a standard 3/8 inch internal tooth lock washer suitable for use with 3/8 inch threaded fasteners in general mechanical, electrical, and HVAC assembly applications.

Installation Notes

Install with the teeth facing the bearing surface of the bolt head or nut, not against the workpiece, to maximize locking effectiveness. Ensure the mating surface is clean and free of debris before installation. These washers are a single-use fastener component and should not be reused once the teeth have been deformed. Follow applicable codes such as the NEC or equipment manufacturer torque specifications when used in electrical assemblies.