Buna-N Rubber Seals | McMaster-Carr

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Durometer 45D to Durometer 65D

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7,864 Products

Sealing

Shaft Seals

Prevent leaks in motors, pumps, and gearboxes

394 products

U-Cup Seals

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

189 products

Piston Seals

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

57 products

Rod Wipers

Scrape dirt off rods to keep the inside of cylinders clean

22 products

Rod Seals

Maintain pressure inside cylinders and prevent fluid leaks

20 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

9 products

O-Rings

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

4,808 products

O-Ring Cord Stock

Cut to length to create customized seals

115 products

Backup Rings

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

141 products

O-Ring Bonding Kits

Everything needed to make O-rings

3 products

Hose Coupling Gaskets

Form tight seals on cam-and-groove, grip-lock, and twist-claw hose connections

30 products

Gasket Material

Cut custom shapes and sizes to fill gaps between flat surfaces

244 products

Tube Fitting Gaskets

Prevent leaks when connecting sanitary tube fittings

50 products

Pipe Gaskets

Form tight seals when connecting flanged pipe fittings

371 products

Manway Gaskets

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

1 product

Made-to-Order Gaskets

Send your exact specifications to get gaskets that fit precisely between surfaces

4 products

Drum Plug Gaskets

Form a tighter seal in drum openings than with a drum plug alone

2 products

Edge Seals

Block dust, water, and wind from entering the gaps around doors and windows

24 products

Sealants

Fill and seal gaps in metal, plastic, wood, and other materials

5 products

Fluid Handling

Tube and Tube Fittings

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

10 products

Hose and Hose Fittings

Flexible and stronger than tubing; often used to convey liquids and gases under pressure

134 products

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

11 products

Fastening and Joining

Sealing Washers

Prevent fluids from leaking around fasteners

81 products

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

8 products

Spacers

Unthreaded to create space between two surfaces or objects, often to align them

2 products

Contact Adhesives

Apply adhesive, air dry, and bring surfaces together to bond

13 products

Building and Machinery Hardware

Grommets

Protect wire, cable, and cords from holes with sharp or rough edges

232 products

Edge Trim

Install on panels, boards, signs, and mirrors to protect edges from impact

2 products

Bumpers

Absorb impact to protect equipment and surfaces from dents and scuffs

12 products

T-Slotted Framing and Fittings

The most versatile system, attach fittings along the continuous slots to build virtually anything

1 product

Raw Materials

Foam

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

132 products

Rubber

Compresses and bounces back to shape; often used for sealing, cushioning, and shock absorbing

637 products

Power Transmission

Hydraulic Cylinder Seals

Replace seals on the piston or rod end of hydraulic cylinders

25 products

Cylinder Rod Glands

Replace the rod gland on hydraulic cylinders

2 products

Compressed Air Filter Seals

Replace O-rings in compressed air filters

16 products

Rod End Seals

Keep dirt out and lubrication in to extend the life of rod ends

16 products

Heating, Ventilation, and Air Conditioning

Pipe Insulation

Fit around pipe, tubing, and tanks to reduce heat loss or condensation

1 product

Fabricating and Machining

Fixture Plate Plugs

Keep chips and shavings from clogging or damaging unused holes on fixture plates in milling machines

2 products