Rubber Washer 2-1/2" OD x 3/4" ID x 1/4" Thick
2-1/2" OD × 3/4" ID × 1/4" Thick — Neoprene, EPDM, Nitrile, Silicone, Natural Rubber, Viton & Fiber
Bulk Discounts
| Quantity | Price per unit |
|---|---|
| Buy 1 – 99 pcs | $4.99 /each |
| Buy 100 – 249 pcs | $4.74 /each |
| Buy 250 – 499 pcs | $4.49 /each |
| Buy 500 – 999 pcs | $4.24 /each |
| Buy 1000 – 2499 pcs | $3.99 /each |
| Buy 2500 + pcs | $3.74 /each |
Rubber Washer 2-1/2" OD x 3/4" ID x 1/4" Thick - Silicone is backordered and will ship as soon as it is back in stock.
Free US shipping on orders $25+ ($8 flat under $25) · 30-day returns · Ships from Elgin, SC
Email me when Silicone is back in 2-1/2" OD x 3/4" ID x 1/4"
We restock sold-out sizes in batches, and requests decide which sizes come back first. One email when it is in stock, nothing else.
Specs at a glance
| Dimension | Inches | Decimal | mm |
|---|---|---|---|
| Outside diameter (OD) | 2-1/2" | 2.5" | 63.5 |
| Inside diameter (ID) | 3/4" | 0.75" | 19.05 |
| Thickness | 1/4" | 0.25" | 6.35 |
| Material | Silicone | ||
Compare the 7 materials
| Material | Service temperature | Oil & grease | Weather / UV | Water | Best for | Avoid |
|---|---|---|---|---|---|---|
| Neoprene | Temperature: from −40°F | Oil & grease: — | Weather / UV: — | Water: — | Best for: General purpose sealing, HVAC systems, marine hardware, plumbing | Avoid: Strong oxidizing acids, ketones, esters |
| EPDM | Temperature: — | Oil & grease: Poor | Weather / UV: Excellent | Water: Excellent | Best for: Outdoor and UV-exposed hardware, roofing, potable water systems, steam lines | Avoid: Petroleum oils, fuels, hydrocarbon solvents |
| Nitrile (Buna-N) | Temperature: — | Oil & grease: Excellent | Weather / UV: Poor | Water: Good | Best for: Automotive fuel systems, hydraulic equipment, oil and gas fittings | Avoid: Outdoor and UV-exposed use, ozone |
| Silicone | Temperature: — | Oil & grease: Poor | Weather / UV: Excellent | Water: Good | Best for: Food processing, high-temp appliances, medical equipment, electronics | Avoid: Petroleum oils, concentrated acids |
| Natural Rubber | Temperature: up to 180°F | Oil & grease: Poor | Weather / UV: Poor | Water: Good | Best for: High-abrasion applications, low-cost general sealing, vibration dampening | Avoid: Outdoor use, oil contact, ozone |
| Viton (FKM) | Temperature: −15°F to 400°F | Oil & grease: Excellent | Weather / UV: Excellent | Water: Good | Best for: Chemical processing, aerospace fuel systems, aggressive solvents | Avoid: Ketones, amines, low-molecular-weight esters |
| Fiber | Temperature: from −40°F | Oil & grease: Good | Weather / UV: Good | Water: — | Best for: Pipe flanges, compression fittings, plumbing gaskets, electrical insulation | Avoid: High-pressure steam, strong acids or alkalis |
A dash (—) means our published ratings differ for that property, so we don't show one. Need a firm figure? Ask us. Temperatures are shown only where every rating we publish agrees. See every size and what's in stock.
Looking for a 2-1/2" outside diameter washer with a 3/4" bore? This 1/4"-thick rubber washer ships in your choice of seven materials. In decimal: 2.5" OD, 0.75" ID, 0.25" thick - about 63.5 x 19 mm with a 6.4 mm profile.
- Outside diameter (OD): 2-1/2" (63.5 mm)
- Inside diameter (ID): 3/4" (19 mm)
- Thickness: 1/4" (6.4 mm)
- Materials: Neoprene, EPDM, Nitrile, Silicone, Natural Rubber, Viton, Fiber
At a full 1/4" thick it works as a cushioning, load-spreading washer for vibration, impact and standoff jobs. The 3/4" inside diameter fits over roughly a 3/4" bolt or rod, and the 2-1/2" outside diameter gives a wide bearing surface to spread load and seal.
Pick your compound at checkout. Buy 50 or more (any sizes) for automatic volume pricing and fast shipping.
See all 2-1/2" OD rubber washers, or use our washer measuring guide to confirm your size.
Rubber Washer Application & Uses
Rubber Washer Application & Uses
Plumbing and Water Systems:
- Bathroom Sink Drain
- Bathtub Drain
- Bathtub Faucet
- Faucet Supply Line
- Hydrant Valve Sealing
- Kitchen Sink Plug
Household Applications:
- Dishwasher Hose Connection
- Washing Machine Hose
- Kegerator Sealing
- Coffee Machine Maintenance
- Refrigeration Units
- Vacuum Cleaner Fittings
Outdoor and Gardening:
- Garden Hose Connections
- Outdoor Faucet
- Outside Tap Sealing
- Lawn Mower Engine Seals
- Irrigation Systems
- Pool Plumbing
Transportation and Machinery:
- Bicycle Components
- Boat Sealing
- Tractor Maintenance
- Automotive Oil Drain Plug
- Sports Equipment Maintenance
- Pressure Washer Fittings
Construction and Industrial:
- Bolt Sealing
- Bottle Trap Sealing
- Metal Bed Frame Cushioning
- Ceiling Fan Blade Stability
- Lighting Fixture Stability
- Metal Beds Stabilization
Electronics and Computing:
- Motherboard Insulation
- Electrical Insulation in Appliances
- Home Heating System Connections
- Large Scale Industrial Use
- Door Hinge Cushioning
- Water Filtration Systems
Miscellaneous:
- License Plate Stabilization
- Lock Sealing
- Delta Faucet Sealing
- Kitchen Mixer Tap
- Mixer Tap Sealing
- General Rubber Washer Ring
- Bed Frame Noise Reduction
- Old Faucet Sealing
- Screw Cushioning
- Shower Head Sealing
- Shower Hose Sealing
- Sink Tap Sealing
- Squeaky Bed Fixing
- Toilet Cisterns
- Toilet Seat Stabilization
- Hozelock Fittings
Material PropertiesSilicone
- Outstanding UV, ozone and weather resistance — the go-to for outdoor, roofing and marine exposure.
- Excellent with water, steam, coolants and mild chemicals.
- Serviceable from roughly -60°F to 300°F.
- Not recommended for petroleum oils, fuels or solvents.
- Compressed non-rubber fiber with high compressive strength and minimal cold flow.
- Holds torque without over-squeezing — ideal under high clamp loads.
- Resists oils, fuels, coolants and solvents.
- Best where a firm, dimensionally stable washer beats a soft rubber seal.
- Highest elasticity, tear strength and abrasion resistance of the lineup.
- Excellent vibration damping and cushioning under load.
- Serviceable from roughly -60°F to 180°F.
- Degrades with oils, fuels, ozone and prolonged sunlight — best for indoor mechanical use.
- Balanced all-purpose rubber with good resistance to oils, greases, ozone and weathering.
- Serviceable from roughly -40°F to 220°F.
- Good compression set, flex fatigue and flame resistance.
- Solid choice for general indoor/outdoor sealing where moderate oil exposure is expected.
- Best-in-class resistance to petroleum oils, fuels and greases.
- Good abrasion and tear resistance; serviceable from roughly -30°F to 250°F.
- Limited UV and ozone resistance — best used indoors or shielded from direct sunlight.
- First pick for automotive, fuel-system and oily-machinery sealing.
- Widest temperature range of the lineup: roughly -70°F to 450°F.
- Excellent UV, ozone and weathering resistance; stays flexible in extreme cold.
- Inert material commonly used in food, beverage and appliance applications.
- Lower tear strength — not suited to oils, fuels or high-abrasion service.
- Premium fluoroelastomer with outstanding chemical resistance — fuels, oils, acids and many solvents.
- Continuous service temperature up to roughly 400°F.
- Excellent UV, ozone and weathering performance.
- The long-life choice for harsh chemical or high-heat environments.
Delivery and Shipping
Delivery and Shipping
Usually Ships Within 24 Hours. All Orders Are Shipped With Tracking Numbers.
Rubber Washer 2-1/2" OD x 3/4" ID x 1/4" Thick - Silicone is backordered and will ship as soon as it is back in stock.
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