Value Collection SEIWIS0310USA-100BX Lock Washer 100 Pack

Product Description

The VALUE COLLECTION SEIWIS0310USA-100BX is a dual-function lock washer featuring both internal and external tooth profiles, designed to resist loosening under vibration and torque loads. Made from Grade 2 steel with a zinc-plated finish for basic corrosion resistance, this washer fits 5/16-inch screw applications with a 0.332-inch inner diameter and a 0.9-inch outer diameter. At 0.04 inches thick and weighing approximately 0.1 pounds per box, these washers are sized for standard fastening assemblies in mechanical, electrical, and structural applications. This package contains 100 washers, sold as a single package quantity, meeting the minimum order requirement.

These lock washers are suited for use in residential and light commercial mechanical assemblies where fastener retention is critical. Typical applications include panel mounting, junction box assembly, HVAC equipment brackets, electrical enclosures, and general structural fastening. The combination internal and external tooth design provides two points of bite contact — gripping both the fastener bearing surface and the mating substrate simultaneously — making them a practical choice where single-tooth washers may not provide sufficient holding force.

Key Features

• Dual tooth profile: internal and external teeth engage both the fastener and the workpiece surface
• Fits 5/16-inch screws with a 0.332-inch inner diameter
• 0.9-inch outer diameter and 0.04-inch thickness for standard-clearance applications
• Grade 2 steel construction for reliable mechanical strength in general-purpose use
• Zinc-plated finish provides basic corrosion protection in dry or low-moisture environments
• 100-piece box quantity supports production and service work without frequent reordering

Compatibility

Designed as a general-purpose replacement or stock lock washer for 5/16-inch fastener assemblies. No specific OEM or model compatibility was stated in the product data.

Installation Notes

Lock washers are typically installed by mechanics, electricians, and HVAC technicians as part of bolted or screwed assemblies. Always de-energize electrical equipment and shut off relevant systems before disassembling or fastening hardware in live panels or equipment enclosures. Place the lock washer between the fastener head or nut and the mating surface, ensuring the teeth contact both surfaces for proper grip. Do not reuse lock washers that have been fully compressed flat, as they will not provide reliable retention after deformation.