Straight Thread O-Rings | McMaster-Carr

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About O-Rings

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 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 Mil. Spec.
Viton® Fluoroelastomer O-Rings

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

Chemical-Resistant Brown
Viton® Fluoroelastomer O-Rings

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

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.

Ultra-Chemical-Resistant Rigid PTFE O-Rings

Rigid and hard with a slippery surface, these PTFE O-rings resist harsh chemicals, such as acetone, fluorinated solvents, methanol, and boric acid.

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- and Steam-Resistant
Kalrez 6375 O-Rings

Kalrez 6375 O-rings are preferred over Kalrez 4079 for chemical-processing environments and applications involving steam.

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.

Oil-Resistant 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-Resistant Hard Buna-N O-Rings

These hard O-rings offer better wear resistance than standard Buna-N O-rings.

Oil- and Abrasion-Resistant Polyurethane O-Rings

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

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.

Water- and Steam-Resistant O-Rings

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

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

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.

High-Temperature O-Rings

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 have a round profile and are suitable for a wide range of static sealing applications.

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.