Buna-N O-Rings | McMaster-Carr

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Material

O-Ring Material

ID

Width

OD

Cross Section Shape

System of Measurement

Dash Number

Hardness

Hardness Rating

Color

For Use With

Diluted Salt Solutions

Synthetic Lubricants

Transmission Fluid

Acetic Acid (White Vinegar)

Fractional Width

Fractional ID

Fractional OD

Thickness

0.019" to 0.043"

0.021" to 0.041"

0.026" to 0.036"

0.035" to 0.045"

0.036" to 0.044"

0.045" to 0.055"

0.046" to 0.078"

0.047" to 0.077"

0.052" to 0.072"

0.054" to 0.070"

0.059" to 0.069"

0.073" to 0.083"

Seal ID

Maximum Temperature

Less than 250° F

250° F to 299° F

300° F to 499° F

Core Material

Specifications Met

NFPA (National Fluid Power Association) Standard

RoHS

Compliant with Exemptions

REACH

Export Control Classification Number (ECCN)

DFARS Specialty Metals

For Use On

Silicone Rubber

Gasket Material

How can we improve?

5,003 Products

Sealing

O-Rings

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

Backup Rings

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

O-Ring Cord Stock

O-Ring Cord Stock

Cut to length to create customized seals

O-Ring Bonding Kits

O-Ring Bonding Kits

Everything needed to make O-rings

Shaft Seals

Prevent leaks in motors, pumps, and gearboxes

U-Cup Seals

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

Piston Seals

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

Rod Seals

Maintain pressure inside cylinders and prevent fluid leaks

Rod Wipers

Scrape dirt off rods to keep the inside of cylinders clean

Cushioning Seals

Cushioning Seals

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

Buffering Seals

Buffering Seals

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

Tube Fitting Gaskets

Tube Fitting Gaskets

Prevent leaks when connecting sanitary tube fittings

Manway Gaskets

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

Fastening and Joining

Sealing Washers

Sealing Washers

Prevent fluids from leaking around fasteners

Fluid Handling

Tube and Tube Fittings

Tube and Tube Fittings

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

Power Transmission

Compressed Air Filter Seals

Compressed Air Filter Seals

Replace O-rings in compressed air filters

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)