Straight Thread O-Rings | McMaster-Carr

Filter by

Dash Number

System of Measurement

Width

Color

Material

Hardness

Hardness Rating

For Use With

Diluted Salt Solutions

Acetic Acid (White Vinegar)

Maximum Temperature

Fractional ID

Fractional Width

Fractional OD

Minimum Temperature

Specifications Met

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

REACH

RoHS

Food Industry Standard

FDA Compliant 21 CFR 177.1550

FDA Compliant 21 CFR 177.2600

Tube OD

Military Specification

O-Ring Grade

Thread Size

Thread Pitch

2,716 Products

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

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

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

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

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.

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- 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

Harder than standard Buna-N O-rings, these 90A durometer O-rings are more durable and wear resistant.

Oil-Resistant Hard Buna-N O-Rings
for Straight-Thread Connections

Also known as boss O-rings, these O-rings are sized to fit straight threaded fittings to prevent leaks. With a 90A durometer hardness, they’re more wear resistant 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 Straight-Thread Connections

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- and Weather-Resistant Neoprene O-Rings

Resistant to changing weather—from rainwater to sunlight—these neoprene O-rings are good for outdoor use.

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 Silicone O-Rings

These silicone O-rings have a round profile and are suitable for a wide range of static sealing applications.

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.

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.