O-Rings | McMaster-Carr

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System of Measurement

ID

Width

Cross Section Shape

OD

Dash Number

Material

Aramid/PTFE Fiber

Hardness

Hardness Rating

Color

For Use With

Diluted Salt Solutions

Fluorinated Solvents

Liquid Insecticides

Synthetic Lubricants

Transmission Fluid

Fractional Width

Fractional ID

Maximum Temperature

Less than 250° F

250° F to 299° F

300° F to 499° F

500° F to 999° F

1,000° F or greater

Core Material

Fractional OD

Thickness

0.018" to 0.025"

0.019" to 0.043"

0.021" to 0.041"

0.024" to 0.038"

0.026" to 0.036"

0.033" to 0.047"

0.035" to 0.045"

0.035" to 0.070"

0.036" to 0.044"

0.036" to 0.056"

0.042" to 0.052"

0.043" to 0.057"

0.045" to 0.055"

0.046" to 0.078"

0.047" to 0.077"

0.047" to 0.109"

Seal ID

Minimum Temperature

-250° F or less

-249° F to -100° F

-99° F to -50° F

-49° F to -1° F

Greater than 0° F

Specifications Met

Fed. Spec. GGG-E-950

NFPA (National Fluid Power Association) Standard

Core Color

RoHS

Compliant with Exemptions

Seal OD

REACH

Export Control Classification Number (ECCN)

DFARS Specialty Metals

How can we improve?

15,153 Products

Sealing

O-Rings

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

11,342 products

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

Packing Seals

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

Packing Seal Lubricating Rings

Packing Seal Lubricating Rings

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

Rod Wipers

Scrape dirt off rods to keep the inside of cylinders clean

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 Seal Installation Tools

Rod Seal Installation Tools

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

Spring-Loaded Seals

Spring-Loaded Seals

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

Head Seals

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

Wear Rings

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

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

Wear Ring Stock

Wear Ring Stock

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

Piston Ring Installation Tools

Piston Ring Installation Tools

Protect piston rings from damage during installation and removal

Shaft Repair Sleeves

Shaft Repair Sleeves

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

Piston Ring Compressors

Piston Ring Compressors

Squeeze piston rings to smoothly install pistons into cylinders

Hose Washers

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

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

Boiler Gaskets

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

Fastening and Joining

Sealing Washers

Sealing Washers

Prevent fluids from leaking around fasteners

Fastener Assortments

Fastener Assortments

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

Raw Materials

Foam

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

Power Transmission

Round Belts

Flexible to send rotary power between unparallel shafts

Compressed Air Filter Seals

Compressed Air Filter Seals

Replace O-rings in compressed air filters

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

Fabricating and Machining

Picks

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

Seal Pullers

Remove the seals around bearings

Small Parts Positioners

Small Parts Positioners

Position and install tiny springs and wires

Packing Seal Pullers

Packing Seal Pullers

Pull packing out of pump and valve seals

Cotter Pin Pullers

Cotter Pin Pullers

Pry out cotter pins

Packing Seal Installation Tools

Packing Seal Installation Tools

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

Measuring and Inspecting

O-Ring Gauges

Identify the size of your O-ring

Facility and Grounds Maintenance

Flush Valve Replacement Parts

Flush Valve Replacement Parts

Replace virtually any part in the most common flush valve brands

Toilet Sealing Rings

Toilet Sealing Rings

Prevent leaks where toilets mount to the floor or wall

Electrical

Electrical Enclosure Fasteners

Electrical Enclosure Fasteners

Mount components to your enclosure without worrying about leaks

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