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Neoprene Rubber Washers for Sealing in Plumbing

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

(19 products)

19 sizesfrom $0.16ships from Elgin, SCbulk pricing from 50+

Flat rubber washers in 19 neoprene sizes from $0.16 each. Choose by bolt and job: small 3/4" OD washers fit #10 and 1/4" screws, 1" and 1-1/4" OD washers take 1/4" to 3/4" bolts, and large 1-1/2" and 2" OD washers spread the load on soft or thin material. Thin 1/16" washers seal under a fastener head; 1/8", 1/4" and the thick 1/2" washer cushion and space. Every size has bulk pricing from 50 pieces, applied in the cart.

Pick your rubber washer size (outside diameter, then bolt hole and thickness)

3/4" OD

3/16" ID × 1/16" thick1/4" ID × 1/16" thick

1" OD

1/4" ID × 1/16" thick3/8" ID × 1/16" thick1/2" ID × 1/16" thick3/8" ID × 1/2" thick

1-1/16" OD

1/2" ID × 1/8" thick

1-1/4" OD

1/4" ID × 1/16" thick5/16" ID × 1/16" thick5/8" ID × 1/16" thick3/4" ID × 1/16" thick

1-1/2" OD

3/8" ID × 1/8" thick3/8" ID × 1/4" thick3/4" ID × 1/8" thick1" ID × 1/8" thick

2" OD

1" ID × 1/16" thick1" ID × 1/8" thick1" ID × 1/4" thick

Not listed? See the size chart below, or the 1,000+ sizes in the box further down.

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.

Neoprene rubber washer size chart (OD × ID × thickness)
Outside diameter Inside diameter (bolt size) Thickness
3/4" OD 3/16" 1/16"
3/4" OD 1/4" 1/16"
1" OD 1/4" 1/16"
1" OD 1/4" 1/8"
1" OD 3/8" 1/2"
1" OD 1/2" 1/16"
1-1/16" OD 1/2" 1/8"
1-1/4" OD 1/4" 1/16"
1-1/4" OD 5/16" 1/16"
1-1/4" OD 5/8" 1/16"
1-1/4" OD 3/4" 1/16"
1-1/2" OD 3/8" 1/8"
1-1/2" OD 3/8" 1/4"
1-1/2" OD 3/4" 1/8"
1-1/2" OD 1" 1/8"
2" OD 1" 1/16"
2" OD 1" 1/8"
2" OD 1" 1/4"
Rubber washer FAQ

Do you have thin rubber washers?
Yes. Nine sizes are 1/16" thick, from 3/4" OD x 3/16" ID up to 2" OD x 1" ID.

What are the smallest rubber washers?
The 3/4" OD washers, with a 3/16" or 1/4" inside diameter and 1/16" thickness. The next size up is 1" OD.

What size rubber washer fits my bolt?
Match the inside diameter to the bolt or screw diameter, then choose the outside diameter for how much surface you want to seal or cushion. Every size in stock is in the chart above.

Do you have thick rubber washers?
Yes. Thicknesses in stock are 1/16", 1/8", 1/4", 1/2". The 1/2" thick 1" OD × 3/8" ID washer also works as a spacer or bushing.

Small or large rubber washers?
Small washers here start at 3/4" OD (with 3/16" and 1/4" IDs); the largest are 2" OD with a 1" ID in 1/16", 1/8" and 1/4" thickness.

Are these flat rubber washers neoprene?
Yes. Every washer in this collection is a flat neoprene rubber washer / spacer.

How fast do rubber washers ship?
Orders usually ship within 24 hours by UPS or FedEx with tracking from our warehouse in Elgin, South Carolina; orders over $199 ship free to the East & Central US (West Coast, Alaska & Hawaii: free over $399).

Related: Rubber O-rings · Rubber grommets · Neoprene bumper pads

Need another size? 1,000+ washer sizes at RubberWasherWarehouse

Our sister store stocks 1,700+ flat rubber washer sizes in neoprene, EPDM, nitrile, silicone, Viton and fiber, searchable by OD, ID and thickness, shipped from the same Elgin, SC warehouse.

Find your size · Neoprene · EPDM · Silicone · Viton

Also searched as: rubber spacers, rubber discs, neoprene spacers, metric (mm) sizes.

Sizing help: Rubber washer size finder · Bolt to washer size chart · How to measure a rubber washer · All guides & size charts
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Compare all 19 sizes Size, key dimension, price and stock in one table

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Applications

  • Thin 1/16" washers seal under a fastener head; 1/8", 1/4" and the thick 1/2" washer cushion and space.
  • Unlike metal washers, rubber washers compress to form a watertight seal, protect finished surfaces from bolt heads, silence rattles, and electrically isolate fasteners.
  • 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.

Rubber Washers: questions

Do you have thin rubber washers?
Yes. Nine sizes are 1/16" thick, from 3/4" OD x 3/16" ID up to 2" OD x 1" ID.
What are the smallest rubber washers?
The 3/4" OD washers, with a 3/16" or 1/4" inside diameter and 1/16" thickness. The next size up is 1" OD.
What size rubber washer fits my bolt?
Match the inside diameter to the bolt or screw diameter, then choose the outside diameter for how much surface you want to seal or cushion. Every size in stock is in the chart above.
How does bulk pricing work?
Bulk discounts apply automatically in the cart, per item: 50+ pieces save 10%, 500+ save 20%, 1,000+ save 30%, 2,500+ save 40% and 5,000+ save 50%. Each product page shows the price at every tier.
How fast do orders ship?
Orders usually ship within 24 hours of being placed, by UPS or FedEx with a tracking number, from our warehouse in Elgin, South Carolina. <a href="/pages/shipping-policy">Shipping policy</a>

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🎉 App-only discount applied at checkout