Value Collection SIWIS0310HDUSA-100BX Lock Washer 100pk

Product Description

The VALUE COLLECTION SIWIS0310HDUSA-100BX is a heavy-duty internal tooth lock washer designed for use with 5/16-inch screws. Manufactured from Grade 2 spring steel with a zinc-plated finish, this washer provides reliable vibration resistance and secure fastening in metal-to-metal joint assemblies. The internal tooth design bites into both the fastener bearing surface and the mating workpiece, resisting loosening under dynamic loads. Inside diameter measures 0.332 inches and outside diameter measures 0.607 inches, with a thickness of 0.045 inches. This box contains 100 washers. Licensed tradespeople and maintenance technicians working in electrical, HVAC, plumbing, and general mechanical applications will find this washer suitable for a wide range of fastening tasks.

This internal tooth lock washer is suited for residential and light commercial applications where standard 5/16-inch fasteners are used. Common installation scenarios include panel enclosure assembly, equipment mounting, conduit support hardware, and general mechanical fastening where vibration or movement could cause fastener backout. The zinc plating provides corrosion resistance in moderate-exposure environments. This washer conforms to DIN 6797 and DIN 6798 standards, making it appropriate for both domestic and internationally specified assemblies. The heavy-duty designation indicates increased tooth engagement compared to standard-duty versions of the same nominal size.

Key Features

• Internal tooth design bites into fastener and workpiece surface to resist loosening under vibration
• Heavy-duty grade with increased tooth engagement for demanding fastening applications
• Grade 2 spring steel construction provides appropriate hardness and spring-back characteristics
• Zinc-plated finish offers corrosion resistance in moderate-exposure environments
• Conforms to DIN 6797 and DIN 6798 standards
• Box quantity of 100 washers reduces per-unit cost for high-volume installation work

Compatibility

Designed for use with 5/16-inch screws and bolts. Inside diameter of 0.332 inches accommodates standard 5/16-inch fastener shanks. Suitable for use in general mechanical, electrical, and equipment-mounting assemblies requiring an internal tooth lock washer at this nominal fastener size.

Installation Notes

Install between the fastener head or nut and the workpiece surface, with the teeth facing the fastener bearing surface. De-energize electrical equipment and relieve system pressure before servicing any assembly that includes this hardware. Use the appropriate torque specifications for the fastener grade and application as defined by the applicable design standard or equipment manufacturer. Do not reuse lock washers that have been fully compressed, as the spring-back function will be reduced.