Value Collection 31353 Lock Washer No. 12 Steel 100 Pack

Product Description

The VALUE COLLECTION 31353 is a No. 12 screw internal tooth lock washer manufactured from Grade 2 steel with a zinc-plated finish. Internal teeth bite into the bearing surface and fastener head as the fastener is tightened, resisting loosening from vibration and torque. The zinc plating provides a baseline layer of corrosion resistance for general-purpose applications. These washers measure 0.022 inches thick with a minimum inside diameter of 0.221 inches and a maximum inside diameter of 0.231 inches. Outside diameter ranges from a minimum of 0.394 inches to a maximum of 0.406 inches. Sold in a pack of 100, this SKU suits high-volume service and maintenance operations.

Internal tooth lock washers in this size are used across HVAC, electrical, plumbing, and general mechanical assembly wherever a No. 12 screw connection requires added vibration resistance. Common applications include panel assembly, equipment enclosure fastening, motor mount hardware, and electrical box installations. The zinc finish makes these washers suitable for indoor and light-duty outdoor environments where mild corrosion resistance is acceptable.

Key Features

• Internal tooth design grips both fastener head and mating surface to resist loosening under vibration
• Grade 2 steel construction for standard-duty fastening applications
• Zinc-plated finish for corrosion resistance in general indoor and light outdoor use
• Sized for No. 12 screws with inside diameter range of 0.221 to 0.231 inches
• 0.022-inch thickness for consistent, low-profile clamping
• Pack of 100 supports production, service, and maintenance workflows

Compatibility

Designed for use with No. 12 screws in standard fastening applications across HVAC, electrical, and mechanical assembly installations.

Installation Notes

Installation requires no special tools beyond standard hand or power drivers appropriate to the mating fastener. Place the lock washer between the fastener head and the work surface with the teeth facing the fastener head for proper engagement. Power down all electrical equipment and de-energize panels before performing any fastener work on live electrical assemblies. Follow applicable NEC or equipment manufacturer guidelines when using hardware inside electrical enclosures.