Neoprene Rubber Washers

Shop neoprene rubber washers in every OD, ID and thickness we stock. Neoprene is weather-resistant and oil-resistant — making it the go-to choice for outdoor plumbing, HVAC, marine and general-purpose sealing. Rated for −40°F to 212°F. Fast shipping and bulk pricing on every order.

Not sure if Neoprene is right for your job? Read our Neoprene material guide for a full compound comparison, or compare all 7 washer materials side by side. New to washer sizing? See how to measure OD, ID & thickness, then shop the full catalog.

Popular Neoprene uses: plumbing, HVAC and marine & boats.

Neoprene washer properties

Why neoprene is the default washer material

Neoprene washers balance every property instead of maxing one: enough weather resistance for outdoor hardware, enough oil tolerance for machinery, good flame resistance, and a forgiving 60–70A hardness that seals ordinary surfaces. When an application doesn't demand a specialist compound, a neoprene washer is the safe pick — which is exactly why most generic "rubber washers" sold in hardware stores are neoprene. For sun-baked or constantly wet installs, EPDM edges it out — see neoprene vs EPDM. For heavy oil or fuel, step up to nitrile.

Every size: small, large and thick neoprene washers

This collection spans ODs from 1/4" to 4", IDs from 1/8" up, and thicknesses from 1/16" to 1/2". That includes flat washers for fastener sealing, large rubber washers (2"–4" OD) for tank fittings and flanges, and thick rubber washers (1/4"–1/2") for vibration damping and uneven surfaces. Find your dimension fast on the size chart. Pair a neoprene washer with a metal washer on top when driving screws — the same stack used with bonded sealing washers.

Neoprene washer FAQ

Are neoprene washers waterproof?

Yes — neoprene absorbs very little water and seals reliably in plumbing, marine and outdoor service. For continuous immersion in chlorinated water, EPDM lasts longer.

Can neoprene washers handle oil?

Moderate oil and grease contact, yes — that's neoprene's advantage over EPDM. For continuous fuel or hydraulic exposure, use nitrile or Viton instead.

How long do neoprene washers last outdoors?

Several years in typical exposure. In relentless direct sun, choose EPDM — its UV resistance is a class above.

Do you sell neoprene washers in bulk?

Every size in this collection carries automatic volume pricing, and the bulk & wholesale program handles larger runs and custom quotes.