O-Rings | McMaster-Carr

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For Use With

Diluted Salt Solutions

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NFPA (National Fluid Power Association) Standard

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

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Export Control Classification Number (ECCN)

2B999

EAR99

DFARS Specialty Metals

17,655 Products

Sealing

O-Rings

Fit snugly into a groove between parts to create a leak-resistant seal

13,843 products

Backup Rings

Extend the life of O-rings and improve their performance under high pressure

263 products

O-Ring Bonding Kits

Everything needed to make O-rings

7 products

Shaft Seals

Prevent leaks in motors, pumps, and gearboxes

533 products

U-Cup Seals

With a lip on both the inside and outside edges, they can be used for sealing rods and pistons

198 products

Packing Seals

Fill in gaps around pump shafts, valve stems, and agitators to prevent leaks

231 products

Packing Seal Lubricating Rings

Install between layers of packing seals to distribute lubricants evenly; also known as lantern rings

8 products

Rod Wipers

Scrape dirt off rods to keep the inside of cylinders clean

109 products

Piston Seals

Prevent leaks inside pistons by creating a seal against the cylinder bore

57 products

Rod Seals

Maintain pressure inside cylinders and prevent fluid leaks

50 products

Rod Seal Installation Tools

Reduce the risk of distorting or breaking seals, wipers, and O-rings during installation

3 products

Spring-Loaded Seals

Seal rods and pistons with a wider range of temperature and chemical resistance than U-cup seals

54 products

Wear Rings

Guide rods and pistons to prevent uneven wear and extend the life of seals

54 products

Head Seals

Maintain a seal even under fluctuating pressure; more reliable than an O-ring with a backup ring

10 products

Cushioning Seals

Reduce wear and noise in air-powered cylinders by blocking the piston from hitting the cylinder body

5 products

Buffering Seals

Protect hydraulic cylinders from pressure spikes and shock in high-pressure applications

22 products

Wear Ring Stock

Cut to make wear rings that fit any rod or bore to prevent uneven wear and extend the life of seals

12 products

Shaft Repair Sleeves

Cover worn shafts with a smooth and protective sealing surface without machining

21 products

Piston Ring Installation Tools

Protect piston rings from damage during installation and removal

3 products

Piston Ring Compressors

Squeeze piston rings to smoothly install pistons into cylinders

7 products

Cord Stock

Cut to length to create customized seals

295 products

Tube Fitting Gaskets

Prevent leaks when connecting sanitary tube fittings

428 products

Hose Washers

Place inside nozzles and spigots to prevent leaks in an attached hose

12 products

Manway Gaskets

Create a tight seal between the nozzle and lid of tank car manways

8 products

Boiler Gaskets

Resist heat and steam to form a leak-resistant seal around closures on boilers

44 products

Fastening and Joining

Sealing Washers

Prevent fluids from leaking around fasteners

752 products

Fastener Assortments

Keep a variety of common screws, nuts, and washers on hand

13 products

Raw Materials

Foam

Pockets of air make it lighter in weight than rubber; good for packing, insulating, and sealing

21 products

Power Transmission

Round Belts

Flexible to send rotary power between unparallel shafts

316 products

Compressed Air Filter Seals

Replace O-rings in compressed air filters

23 products

Fluid Handling

Tube and Tube Fittings

Typically more flexible than pipe for carrying liquids and gases in short runs around equipment

33 products

Fabricating and Machining

Picks

Hold, separate, and position small parts such as wire and springs

125 products

Seal Pullers

Remove the seals around bearings

3 products

Small Parts Positioners

Position and install tiny springs and wires

17 products

Packing Seal Pullers

Pull packing out of pump and valve seals

Packing Seal Installation Tools

Install packing into hard-to-reach areas without damaging the packing

2 products

Measuring and Inspecting

O-Ring Gauges

Identify the size of your O-ring

4 products

Facility and Grounds Maintenance

Flush Valve Replacement Parts

Replace virtually any part in the most common flush valve brands

6 products

Toilet Sealing Rings

Prevent leaks where toilets mount to the floor or wall

8 products

Electrical Power, Networking, and Controlling

Electrical Enclosure Fasteners

Mount components to your enclosure without worrying about leaks

3 products