Fender Washers (¼”, ⅜”, ½”, 1″)

Fender Washers

Fender Washers – Maximum Load Distribution and Anti-Pull-Through Security for Thin Materials

Fender Washers are specialized flat washers characterized by an extra-large outer diameter (OD) relative to their inner diameter (ID), making them critical fasteners for high-leverage and thin-material applications. This design maximizes the bearing surface, which is essential for distributing the clamping force of a bolt or nut over a wide area, thereby preventing the fastener head from pulling through thin sheet metal, or embedding itself into soft substrates like wood.

Constructed from durable zinc-plated steel, these washers offer excellent corrosion resistance, ensuring reliable joint integrity in automotive, construction, and general mechanical applications. They are available in a range of common inner diameters, including 1/4″, 3/8″, 1/2″, and 1″, covering most small-to-medium bolt sizes.

Key Benefits

• Maximum Load Distribution: Significantly larger OD distributes clamping load over the maximum possible surface area.

• Anti-Pull-Through Security: Prevents fastener heads from sinking into soft material or pulling through sheet metal.

• Corrosion Resistance: Zinc plating protects the steel from rust and weathering.

• Hole Repair: Ideal for covering oversized, damaged, or irregular bolt holes in a fixture.

• Size Versatility: Available in 1/4″, 3/8″, 1/2″, and 1″ Inner Diameters to fit common bolt sizes.

Technical Specifications

• Product Type: Fender Washer (Extra-Wide Flat Washer)

• Sizes Available (ID): 1/4″, 3/8″, 1/2″, 1″ (Inner Diameter)

• Material: Steel

• Design: Large Outer Diameter (OD)

• Application: Load Distribution, Thin Materials, Oversized Holes

• Grade: Automotive/Mechanical/Construction

Perfect For

• Securing vehicle body panels, fenders, and trim.

• Fastening thin sheet metal or plastic parts to a frame.

• Woodworking applications where large through-bolts are used near edges.

• Providing a stable bearing surface beneath nuts and bolt heads in soft wood.

Application Instructions

• Placement: Place the fender washer beneath the nut or the head of the bolt/screw, ensuring the washer contacts the surface of the material being clamped.

• Function: The large OD should rest on the material that requires load distribution or protection.

• Tightening: Tighten the fastener to the proper torque specification.

• Safety: Use in conjunction with a lock washer (when needed for vibration) for the most secure joint.

Pro Tips

• Fender washers are highly recommended when bolting through fiberglass or soft plastics to prevent the bolt head from cracking the material.

• Always choose a washer with an ID that is slightly larger than the bolt diameter for a snug fit.

• Use a lock washer beneath the nut, and the fender washer beneath the bolt head for maximum protection and security.

• Store unused washers in a dry environment to maintain the integrity of the zinc plating.

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