Boss O-Rings | McMaster-Carr

Filter by

Hardness

Hardness Rating

Color

Dash Number

Material

Width

For Use With

Maximum Temperature

Minimum Temperature

Specifications Met

DFARS Compliance

RoHS Compliance

Fractional Width

Fractional ID

Fractional OD

REACH Compliance

Tube OD

Food Industry Standard

Military Specifications Met

Forward

How can we improve?

1,972 Products

About O-Rings

Oil-Resistant Hard Buna-N O-Rings for Tube
Fittings with Straight-Thread Connection

Also known as Boss O-rings, these hard O-rings are for use in tube fittings with a straight-thread connection.

Oil- and Abrasion-Resistant Polyurethane O-Rings
for Tube Fittings with Straight-Thread Connection

Commonly called Boss O-rings, these O-rings are for use in tube fittings with a straight-thread connection.

Oil- and Abrasion-Resistant Polyurethane O-Rings

More abrasion resistant than Buna-N O-rings, these also resist mineral oil and motor oil.

Chemical-Resistant Hard Viton®
Fluoroelastomer O-Rings for Tube
Fittings with Straight-Thread Connection

Also known as Boss O-rings, these hard O-rings are for use in tube fittings with a straight-thread connection.

Chemical-Resistant Mil. Spec. Viton®
Fluoroelastomer O-Rings for Tube
Fittings with Straight-Thread Connection

Also known as Boss O-rings, these O-rings are for use in tube fittings with a straight-thread connection. They meet MIL-R-83248.

Chemical-Resistant Brown Viton®
Fluoroelastomer O-Rings for Tube
Fittings with Straight-Thread Connection

Also known as Boss O-rings, these O-rings are for use in tube fittings with a straight-thread connection. They are brown for easy identification.

Chemical-Resistant Brown
Viton® Fluoroelastomer O-Rings

Because one black O-ring looks just like another, these O-rings are brown for easy identification.

Chemical-Resistant Mil. Spec.
Viton® Fluoroelastomer O-Rings

All of these O-rings meet MIL-R-83248C.

Ultra-Chemical-Resistant Rigid PTFE O-Rings for
Tube Fittings with Straight-Thread Connection

These temperature- and chemical-resistant O-rings prevent leaks in tube fittings that have a straight-thread connection, also known as O-ring boss fittings.

Chemical-Resistant
Low-Temperature Fluorosilicone O-Rings for
Tube Fittings with Straight-Thread Connection

Flexible even at temperatures as low as -75° F, these fluorosilicone O-rings will keep your fittings free from leaks. They’re often used on fuel and coolant hose because fluorosilicone resists many chemicals, including ethanol and ethylene glycol.

Ultra-Chemical-Resistant Kalrez 4079 O-Rings for
Tube Fittings with Straight-Thread Connection

Also known as Boss O-rings, these Kalrez 4079 O-rings are for use in tube fittings with a straight-thread connection. They’re inherently softer and more compressible than PTFE O-rings with comparable chemical resistance.

Ultra-Chemical-Resistant Kalrez 4079 O-Rings

Inherently softer and more compressible than PTFE O-rings, these Kalrez 4079 O-rings have comparable chemical resistance.

Water- and Steam-Resistant EPDM O-Rings for
Tube Fittings with Straight-Thread Connection

Also known as Boss O-rings, these O-rings are for use in tube fittings with a straight-thread connection.

Water- and Steam-Resistant EPDM O-Rings

These O-rings also resist ethanol and ethylene glycol.

Water-Resistant Neoprene O-Rings for Tube
Fittings with Straight-Thread Connection

Also known as Boss O-rings, these O-rings are for use in tube fittings with a straight-thread connection.

Water-Resistant Neoprene O-Rings

These O-rings also resist ammonia, ethylene glycol, and isopropyl alcohol.

High-Temperature High-Purity Silicone O-Rings
for Tube Fittings with Straight-Thread Connection

Also known as Boss O-rings, these O-rings are for use in tube fittings with a straight-thread connection.

High-Temperature Silicone O-Rings

These silicone O-rings withstand temperatures up to 400° F or 450° F.

O-Ring Assortments

Oil-Resistant Hard Buna-N O-Ring Assortments
for Tube Fittings with Straight-Thread Connection

Also known as Boss O-rings, these hard O-rings are for use in tube fittings with a straight-thread connection.

Chemical-Resistant Hard Viton®
Fluoroelastomer O-Ring Assortments for
Tube Fittings with Straight-Thread Connection

Also known as Boss O-rings, these hard Viton® fluoroelastomer O-rings are for use in tube fittings with a straight-thread connection. They offer excellent resistance to wear.

About O-Rings

O-Rings

Oil-Resistant Hard Buna-N O-Rings for TubeFittings with Straight-Thread Connection

Oil- and Abrasion-Resistant Polyurethane O-Ringsfor Tube Fittings with Straight-Thread Connection

Oil- and Abrasion-Resistant Polyurethane O-Rings

Chemical-Resistant Hard Viton®Fluoroelastomer O-Rings for Tube Fittings with Straight-Thread Connection

Chemical-Resistant Mil. Spec. Viton®Fluoroelastomer O-Rings for Tube Fittings with Straight-Thread Connection

Chemical-Resistant Brown Viton®Fluoroelastomer O-Rings for Tube Fittings with Straight-Thread Connection

Chemical-Resistant BrownViton® Fluoroelastomer O-Rings

Chemical-Resistant Mil. Spec.Viton® Fluoroelastomer O-Rings

Ultra-Chemical-Resistant Rigid PTFE O-Rings forTube Fittings with Straight-Thread Connection

Chemical-ResistantLow-Temperature Fluorosilicone O-Rings for Tube Fittings with Straight-Thread Connection

Ultra-Chemical-Resistant Kalrez 4079 O-Rings forTube Fittings with Straight-Thread Connection

Ultra-Chemical-Resistant Kalrez 4079 O-Rings

Water- and Steam-Resistant EPDM O-Rings forTube Fittings with Straight-Thread Connection

Water- and Steam-Resistant EPDM O-Rings

Water-Resistant Neoprene O-Rings for TubeFittings with Straight-Thread Connection

Water-Resistant Neoprene O-Rings

High-Temperature High-Purity Silicone O-Ringsfor Tube Fittings with Straight-Thread Connection

High-Temperature Silicone O-Rings

O-Ring Assortments

Oil-Resistant Hard Buna-N O-Ring Assortmentsfor Tube Fittings with Straight-Thread Connection

Chemical-Resistant Hard Viton®Fluoroelastomer O-Ring Assortments for Tube Fittings with Straight-Thread Connection

Oil-Resistant Hard Buna-N O-Rings for Tube
Fittings with Straight-Thread Connection

Oil- and Abrasion-Resistant Polyurethane O-Rings
for Tube Fittings with Straight-Thread Connection

Chemical-Resistant Hard Viton®
Fluoroelastomer O-Rings for Tube
Fittings with Straight-Thread Connection

Chemical-Resistant Mil. Spec. Viton®
Fluoroelastomer O-Rings for Tube
Fittings with Straight-Thread Connection

Chemical-Resistant Brown Viton®
Fluoroelastomer O-Rings for Tube
Fittings with Straight-Thread Connection

Chemical-Resistant Brown
Viton® Fluoroelastomer O-Rings

Chemical-Resistant Mil. Spec.
Viton® Fluoroelastomer O-Rings

Ultra-Chemical-Resistant Rigid PTFE O-Rings for
Tube Fittings with Straight-Thread Connection

Chemical-Resistant
Low-Temperature Fluorosilicone O-Rings for
Tube Fittings with Straight-Thread Connection

Ultra-Chemical-Resistant Kalrez 4079 O-Rings for
Tube Fittings with Straight-Thread Connection

Water- and Steam-Resistant EPDM O-Rings for
Tube Fittings with Straight-Thread Connection

Water-Resistant Neoprene O-Rings for Tube
Fittings with Straight-Thread Connection

High-Temperature High-Purity Silicone O-Rings
for Tube Fittings with Straight-Thread Connection

Oil-Resistant Hard Buna-N O-Ring Assortments
for Tube Fittings with Straight-Thread Connection

Chemical-Resistant Hard Viton®
Fluoroelastomer O-Ring Assortments for
Tube Fittings with Straight-Thread Connection