Buna-N Rubber Seals | McMaster-Carr

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Seal ID

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For Use With

Diluted Salt Solutions

Dissimilar Metals

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Grooved-End Pipe Fittings

Bore Diameter

Width

Cross Section Shape

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Hardness

Durometer 45D to Durometer 65D

Durometer 60D

Rockwell B70

Maximum Rotation Speed

For Sealing

Hardness Rating

REACH

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Compliant with Exemptions

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

Yes

DFARS Specialty Metals

Exempt

Not Compliant

Export Control Classification Number (ECCN)

Diaphragm Material

Grip Material

Seal Material

8,042 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

4,870 products

Backup Rings

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

191 products

O-Ring Bonding Kits

Everything needed to make O-rings

16 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

369 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

26 products

Cord Stock

Cut to length to create customized seals

239 products

Sealants

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

7 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

Fluid Handling

Tube Fitting Rings

Snap onto push-to-connect fittings to identify different tubing lines

6 products

Tube Fitting Nuts

Tighten to create a strong seal between tube and tube fittings

3 products

Hose Fittings

Create threaded, barbed, quick-disconnect, and other types of connections between lengths of hose

26 products

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

11 products

Building and Machinery Hardware

Grommets

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

234 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

20 products

T-Slotted Framing Seals

Fill gaps around doors and panels to keep air, dust, and liquid out of T-slotted framing structures

1 product

Raw Materials

Rubber

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

687 products

Foam

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

132 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

20 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