Value Collection SIWIS0620HDUSA-010BX Lock Washer

Product Description

The VALUE COLLECTION SIWIS0620HDUSA-010BX is a heavy-duty internal tooth lock washer designed for 5/8-inch screw applications. Stamped from Grade 2 spring steel and finished with a zinc plating, this washer bites into mating surfaces under torque to resist loosening from vibration and dynamic loads. The internal tooth geometry keeps the washer centered on the fastener shank, making it a reliable choice for electrical enclosures, mechanical assemblies, and structural connections where a secure, low-profile locking solution is required. Licensed electricians, millwrights, and general contractors regularly specify this style of washer in panel and equipment installations.

This internal tooth lock washer is suited for residential and commercial applications where standard hardware must meet consistent dimensional tolerances. It fits a 5/8-inch screw with an inside diameter of 0.659 inches and an outside diameter of 1.134 inches, and a thickness of 0.062 inches. The zinc finish provides a baseline level of corrosion resistance for indoor and protected outdoor environments. It is sold in a minimum order quantity of 10 pieces.

Key Features

• Internal tooth design centers on fastener shank and grips both the fastener head and mating surface simultaneously
• Heavy-duty designation with spring steel construction for consistent load retention
• Grade 2 material classification for standard fastener assembly applications
• Zinc-plated finish for corrosion resistance in typical indoor environments
• Inside diameter of 0.659 inches fits 5/8-inch screw applications
• Outside diameter of 1.134 inches and thickness of 0.062 inches for a low-profile installation footprint

Compatibility

Designed as an OEM-style replacement or standard hardware component for 5/8-inch screw fastener assemblies in mechanical, electrical, and structural applications.

Installation Notes

Install with the teeth facing the fastener head or nut bearing surface to maximize locking engagement. Power down all electrical equipment before servicing any panel or enclosure that requires hardware replacement. Follow applicable NEC guidelines when using lock washers in electrical enclosure assemblies. Do not reuse a lock washer that has been fully compressed, as the spring tension will be reduced.