3/8" x 1-1/2" x 0.118" Thick Fender Washers, 304 SS, 20 PCS — Open-Box, 7% Off

Dimensions & Fit: Inner Diameter: 3/8"; Outer Diameter: 1-1/2"; Thickness: 0.118". Fits 3/8" bolts, screws, and studs. Please confirm your fastener shank size before purchase to ensure proper fit.

304 Stainless Steel: Made from 18-8 (304) stainless steel, these fender washers resist corrosion in damp outdoor environments like decks, fences, and garden structures. Suitable for long-term outdoor exposure without rapid rusting.

Reduces Embedment: Extra thickness stays flat when tightened, instead of bending against the wood. Paired with the large OD to spread pressure over a wider surface, this helps prevent slow sinking into soft lumber, composite decking, or damp wood under heavy load.

Heavy-Duty Use: Ideal for securing deck boards to joists, anchoring posts for pergolas/fences/sheds, mounting heavy gate hinges, and building landscape framing. Also works well for general DIY, furniture assembly, and everyday household repairs.

Solid Build & Smooth Edges: The thick, rigid build provides a substantial, professional feel in hand. Each flat washer is deburred for clean, smooth edges that won't scratch wood surfaces or snag during installation, ensuring a clean finish and secure fit.

When a standard fender washer sinks into the wood, you need more than a large OD. You need more thickness behind it. Fender washers use a large outside diameter to spread bolt pressure over a wider surface than standard washers. But OD alone isn't enough for every job. A standard-thickness fender may embed into soft wood under heavy load, in damp conditions, or on composite decking. Added thickness is built for these exact situations. Wide OD spreads the pressure. Added thickness keeps the washer from bending into soft wood. Hardware stays seated, deck boards stay flat. Made from 304 stainless steel (18-8) for strength and corrosion resistance outdoors—decks, fences, garden structures, and damp climates. Where They Work Post bases for decks, pergolas, fences, sheds Deck board to joist fastening, keeps walking surface flat Landscape framing, retaining wall caps, raised garden beds Heavy gate hinges, outdoor shelving, playset anchors Dock and boardwalk hardware on composite or treated lumber