Value Collection 31466 Vulcanized Fiber Flat Washer 50 Pack

Product Description

The VALUE COLLECTION 31466 is a standard flat washer made from vulcanized fiber with a plain finish. Vulcanized fiber is a cellulose-based, resin-free composite material that offers electrical insulation, light weight, and moderate mechanical strength. This washer measures 0.312 inches inside diameter, 0.500 inches outside diameter, and 0.031 inches thick. It is used to distribute load under a fastener head or nut, provide a seating surface, and serve as a non-conductive isolation layer in assemblies where metal washers would create a ground path or galvanic interaction. Licensed trades and maintenance technicians install these in electrical enclosures, panel assemblies, and mechanical fixtures where insulating hardware is required.

This washer is suited for light-duty fastener assemblies in residential and commercial electrical, electronic, and mechanical applications. Its vulcanized fiber construction meets the MIL-I-24768 and 27 GEE-F (G10 and FR-4) fastener standards, making it appropriate for use in environments that require non-metallic, electrically insulating hardware. Typical installation scenarios include panel board assemblies, switchgear, motor mounts, and general-purpose equipment where a thin, flat, insulating washer is specified. Each package contains 50 washers.

Key Features

• Vulcanized fiber construction provides electrical insulation and eliminates galvanic interaction with dissimilar metals
• Plain finish with no coating or plating — no risk of finish flaking in sensitive assemblies
• Meets MIL-I-24768 and 27 GEE-F (G10 and FR-4) fastener standards
• 0.031-inch thickness suits tight-clearance fastener stacks
• Inch measurement system — 0.312-inch ID fits standard 5/16-inch fasteners
• Sold in a package of 50 washers

Compatibility

Designed as an OEM-style replacement or standard-service flat washer for assemblies requiring a non-metallic, electrically insulating washer in the 5/16-inch fastener size range.

Installation Notes

Installation is typically performed by licensed electricians, electronics technicians, or mechanical maintenance trades. Always de-energize and lock out the assembly before servicing any fastened connection in an electrical enclosure or panel. Vulcanized fiber washers are not rated for high-heat or high-moisture environments — verify suitability against the application's temperature and humidity requirements before installation. Do not overtighten fasteners, as vulcanized fiber can crack or deform under excessive clamp load.