Buna-N Rubber Rounds | McMaster-Carr

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7,778 Products

Most Likely Products

O-Rings

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

4,870 products

Cord Stock

Cut to length to create customized seals

105 products

Backup Rings

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

191 products

Bumpers

Absorb impact to protect equipment and surfaces from dents and scuffs

109 products

Rubber

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

73 products

All Results

Sealing

O-Rings

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

4,870 products

Cord Stock

Cut to length to create customized seals

105 products

Backup Rings

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

191 products

Gasket Material

Cut custom shapes and sizes to fill gaps between flat surfaces

18 products

Made-to-Order Gaskets

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

4 products

Tube Fitting Gaskets

Prevent leaks when connecting sanitary tube fittings

50 products

Drum Plug Gaskets

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

2 products

Pipe Gaskets

Form tight seals when connecting flanged pipe fittings

369 products

Hose Coupling Gaskets

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

30 products

Manway Gaskets

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

1 product

Cushioning Seals

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

5 products

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 Seals

Maintain pressure inside cylinders and prevent fluid leaks

20 products

Buffering Seals

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

9 products

Rod Wipers

Scrape dirt off rods to keep the inside of cylinders clean

22 products

Building and Machinery Hardware

Bumpers

Absorb impact to protect equipment and surfaces from dents and scuffs

109 products

Grommets

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

230 products

Access Panels

Install in ceilings, walls, concrete floors, and tanks to access and inspect inside

8 products

Knobs

Position, tighten, and secure fixtures and equipment

6 products

Vibration-Damping Pads

Place under machinery to reduce vibration and noise, extending service life and protecting floors

11 products

Bellows

Prevent dust and debris from damaging moving parts

18 products

Ball Knobs

Provide grip on control levers and push-pull rods

20 products

Fastening and Joining

Standoffs

Separate, position, or connect components in assemblies

16 products

Spacers

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

2 products

Sealing Washers

Prevent fluids from leaking around fasteners

81 products

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

9 products

Cap Nuts

Cover and protect threads while adding a finished look; also known as acorn nuts

13 products

Rounded Head Screws

Sit just above the surface for a low-profile finish and hold tighter than flat head screws

98 products

Raw Materials

Rubber

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

73 products

Power Transmission

Thrust Bearings

Support loads parallel to the shaft with plain, ball, or roller bearings

6 products

Ball Bearings

Create less friction than other bearings for use at high speeds

628 products

Roller Bearings

Support higher loads than ball bearings, but run at lower speeds

61 products

Drive Rollers

Transmit power from motors to systems like conveyors; also known as contact wheels and feed rollers

16 products

Flexible Shaft Couplings

Connect two shafts that are misaligned to transfer rotary motion from one to the other

5 products

Fluid Handling

Sights

Observe and monitor the contents of pipes, tanks, and other containers

30 products

Facility and Grounds Maintenance

Manhole Covers

Made of cast iron to handle high-volume foot and vehicle traffic.

1 product