Rubber Washers – Neoprene Flat Washers, Spacers & Seals (All Sizes)

Shop rubber washers in every common size — flat neoprene washers with rubber construction for sealing, spacing, cushioning, and vibration damping. Unlike metal washers, rubber washers compress to form a watertight seal, protect finished surfaces from bolt heads, silence rattles, and electrically isolate fasteners. Every washer lists its exact OD x ID x thickness with a spec diagram, so you can match your bolt size and application precisely.

How to size a rubber washer: the inside diameter (ID) should match your bolt or screw diameter (a 3/8" bolt takes a 3/8" ID washer); the outside diameter (OD) determines how much sealing/bearing surface you get — wide-OD styles work like rubber fender washers, spreading load across soft or thin material; thickness sets compression and cushioning — 1/16" soft rubber washer seals for plumbing and compression sealing under fastener heads, up to thick 1/4"–1/2" washers that double as spacers and bushings. Large rubber washers up to 2" OD are stocked for oversized holes and load spreading.

Common uses: plumbing fixture and faucet seals, rubber washers for bolts on decks and roofing, equipment mounting, spacers for machinery, electrical isolation, and anti-rattle pads. Neoprene handles water, weather, and moderate oil — see the rubber material guide, or read using rubber washers as gaskets, seals, O-rings, and dampers. Need round sealing rings? See rubber O-rings. Production quantities? Bulk pricing available.