Able to withstand temperatures up to 400° F, these silicone O-rings are softer than standard silicone O-rings for a better seal in low-pressure applications. They have a round profile and are suitable for a wide range of static and dynamic sealing applications. All are sized to the SAE standard AS568.

Also known as boss O-rings, these O-rings are sized to fit straight-thread fittings to prevent leaks. They were first designed for biomedical use, are made of FDA-listed materials, and are USP VI certified. Their high purity makes them a common choice for food and pharmaceutical applications. Made of silicone, they resist heat up to 400° F for use in high-temperature lines. All have a cure date and a traceable lot number printed on the bag. These O-rings are not cleaned and bagged.

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. Also known as Boss O-rings, these O-rings work with tube fittings with a straight-thread connection, such as BSPP, UN/UNF, and most metric fittings.

These O-rings meet MIL and ASTM standards for the chemical and physical properties of fluorosilicone. They also meet SAE AS568A for standard O-ring sizing.

Also known as Boss O-rings, these O-rings are used in tube fittings with a straight-thread connection. Made of PTFE, they withstand extreme temperatures and harsh chemicals such as fluorinated solvents, ethanol, and acetone. They’re also rigid, which makes them more difficult to install than flexible O-rings. These O-rings are FDA compliant for direct contact with food. You’ll find them in pump shafts, mixing tanks, and other equipment that processes chemicals or pharmaceuticals. Install them behind the threads on a male fitting. As you tighten against a female fitting, the O-ring compresses to form a tight seal. All have a cure date and a traceable lot number on the bag.

Also known as Boss O-rings, these O-rings are made for tube fittings with a straight-thread connection. Made of Kalrez 4079, they combine the chemical resistance of PTFE with the springy softness of Viton® fluoroelastomer. They hold up to a wide range of chemicals, such as acetone, methyl ethyl ketone (MEK), potassium hydroxide, and most acids.

Also known as Boss O-rings, these O-rings are made for tube fittings with a straight-thread connection. They’re made of Viton® fluoroelastomer that meets MIL-R-83248 performance standards. Often used in fuel or hydraulic systems, they resist chemicals such as benzene, butyl alcohol, and ethylene glycol. Fit these O-rings behind the threads on a male fitting. As you tighten against a female fitting, the O-ring compresses to form a tight seal. All have shelf life, a cure date, and a traceable lot number printed on the bag.

The same chemical and heat resistance as Kalrez 4079 without the brand name. These FFKM O-rings resist a wide range of chemicals, including acetone, methyl ethyl ketone (MEK), potassium hydroxide, and most acids—even at scorching temperatures of 600° F. Also known as boss O-rings, they’re sized to fit straight-thread fittings to prevent leaks. Use them to seal fittings in high-temperature chemical lines. All have cure date and a traceable lot number printed on the bag.

Also known as Boss O-rings, these hard Viton® fluoroelastomer O-rings are for use in tube fittings with a straight-thread connection. They resist a wide range of chemicals, including benzene, butyl alcohol, and ethylene glycol. All have a round profile and are suitable for both static and dynamic sealing applications. These O-rings are sized to the SAE standard AS568.

Also known as boss O-rings, these neoprene O-rings seal straight-thread fittings in valve housings, outdoor enclosures, and saltwater applications. They resist water, UV rays, and mild chemicals, making them good for use both indoors and outdoors. Compared to EPDM O-rings, these neoprene O-rings have better resistance to oil and chemicals. All have shelf life, cure date, and a traceable lot number printed on the bag.