Value Collection SEIWIS0370USA-100BX Lock Washer 3/8 in

Product Description

The VALUE COLLECTION SEIWIS0370USA-100BX is a dual-action internal and external tooth lock washer designed for 3/8 inch screw applications. Stamped from Grade 2 steel with a zinc-plated finish, it provides corrosion resistance and reliable fastener retention under vibration and dynamic loads. The washer measures 0.398 inches inside diameter and 0.985 inches outside diameter, with a thickness of 0.045 inches. It is suited for general mechanical and structural fastening work where a secure, cost-effective locking solution is required.

This lock washer is used in residential and light commercial mechanical assemblies, electrical panel work, HVAC equipment mounting, and general fabrication where fastener loosening under vibration is a concern. The combined internal and external tooth design increases grip surface area against both the fastener head and the mating surface, making it a versatile choice across multiple trade applications.

Key Features

• Dual internal and external tooth design maximizes grip on fastener and mating surface
• Grade 2 steel construction for reliable mechanical strength in general-purpose fastening
• Zinc-plated finish provides corrosion resistance in typical indoor and light outdoor environments
• 0.398 inches ID fits standard 3/8 inch fasteners
• 0.045 inch thickness maintains low profile under fastener head
• Does not meet military specifications — intended for standard commercial and trade use

Compatibility

Designed as a general-purpose replacement or service lock washer for standard 3/8 inch screw and bolt fastener assemblies in mechanical, electrical, HVAC, and plumbing trade applications.

Installation Notes

Install this lock washer between the fastener head or nut and the mating surface before torquing. Ensure the mating surface and fastener threads are clean and free of debris before assembly. This washer is intended for manual or powered hand-tool installation — do not use in applications requiring military-specification hardware. Follow applicable NEC, IPC, or IFGC fastener requirements for the system being serviced.