Hillman 290027 Fender Washer 5/16 in Zinc Steel 100 Ct

Product Description

The HILLMAN 290027 is a zinc-plated steel fender washer designed for applications that demand a larger bearing surface than a standard flat washer provides. The oversized outer diameter distributes load more effectively across soft or thin materials, reducing pull-through and surface damage. The zinc plating adds corrosion resistance for use in moderately exposed environments. This box contains 100 washers sized for a 5/16-inch fastener. Trade professionals in sheet metal work, plumbing, and electrical installation keep these on hand for high-volume jobs where consistent fastener performance matters.

Fender washers in this size range are widely used in light commercial and residential construction and repair. Typical applications include securing sheet metal panels, anchoring electrical boxes and conduit straps, fastening plumbing straps and brackets, and any situation where a standard washer would not provide adequate surface coverage. The 5/16-inch hole size pairs with 5/16-inch bolts, screws, and threaded rod commonly found across these trades.

Key Features

• Oversized outer diameter distributes clamping load over a larger surface area than standard flat washers
• Zinc plating provides corrosion resistance for interior and moderate-exposure applications
• Steel construction delivers reliable tensile and shear strength for fastener assemblies
• 5/16-inch inner diameter fits standard 5/16-inch fasteners used across HVAC, plumbing, and electrical work
• 100-count box supports high-volume installations and reduces per-unit cost on larger jobs

Compatibility

Designed for use with 5/16-inch bolts, screws, and threaded rod in sheet metal, plumbing, and electrical fastening applications.

Installation Notes

Fender washers are installed by general contractors, electricians, plumbers, and HVAC technicians as part of standard fastener assemblies. Place the washer over the fastener shank before driving into the mating surface to ensure full contact between the washer face and the work material. Avoid over-torquing fasteners, which can deform the washer and reduce load distribution effectiveness. Zinc-plated hardware is not recommended for direct outdoor or high-moisture exposure where hot-dip galvanized or stainless hardware is more appropriate.

Technical Specifications

• Inner Diameter: 5/16 inches
• Length: 1.5 inches
• Material: Steel
• Finish: Zinc Plated
• Quantity: 100 per box
• Weight: 2.81 pounds
• UPC: 00008236090345

Standard Information

• Brand: HILLMAN
• Manufacturer Part Number: 290027