Mr O-Ring 175 Viton O-Ring 90A Durometer, 9 in ID Pack of 10

In this review the Mr O-Ring 175 Viton O-Ring is assessed for workshop and industrial sealing tasks where chemical and temperature resistance matter most. The bottom line: this pack of 10, 90A durometer Viton o-rings delivers reliable sealing across fuels, oils and high temperature air, making it a practical choice for mechanics, fabricators and maintenance techs who need durable, chemical-resistant seals. The review focuses on material performance, dimensional accuracy and typical use cases to help readers decide if these o-rings fit their repair or OEM needs.

Key Features

• Material: Made from Viton (FKM), the o-ring resists high temperature, ozone and many organic solvents, which reduces unexpected seal failures in aggressive environments.
• Hardness: The 90A durometer provides a firm sealing surface that holds shape under compression while still allowing a proper seal in static and some dynamic applications.
• Dimensions: Nominal 9 in ID with actual measured dimensions close to spec, providing predictable fit for AS568 size applications in pumps, valves and flanges.
• Chemical compatibility: Performs well with petroleum products, diesel and biodiesel blends, mineral oils, silicone greases and many solvents, expanding its usefulness across fuel and lubrication systems.
• Temperature range: Rated from -26C (-15F) to 232C (450F), making these o-rings suitable for both low-temperature storage and very high temperature air or fluid exposure.
• Pack sizing: Sold as a pack of 10 which helps shops and technicians keep common replacement parts on hand for frequent maintenance tasks.

Who It's For

These Viton o-rings are aimed at maintenance technicians, mechanics and industrial users who need seals that withstand fuel, oil and elevated temperatures. The combination of 90A hardness and Viton chemistry suits applications in fuel systems, hydraulic fittings, high temperature vents and exposed outdoor equipment.

Those working exclusively with water, steam at very high pressure, or where extreme flexibility at very low temperatures is required should consider alternate elastomers designed specifically for those conditions; likewise, designers needing exact custom compounds or soft, low-durometer seals may prefer other options.

Pros & Cons

Pros

• Excellent resistance to fuels, oils and many solvents, reducing frequency of replacements in chemical exposures.
• Wide operating temperature range that covers most automotive and light industrial needs.
• 90A durometer provides durable, shape-retaining sealing for static and some dynamic uses.

Cons

• Higher durometer means less pliability than softer o-rings, so it may not be ideal for seals requiring significant elasticity.
• Viton is more expensive than generic elastomers, which could be a consideration for very large volume applications.

Specifications

Our Verdict

The Mr O-Ring 175 Viton o-ring is a solid, practical choice for users who need reliable chemical and high temperature resistance in a familiar AS568 size. For workshops and maintenance teams that replace seals frequently in fuel and oil systems, this pack of 10 offers predictable dimensions and durable performance, representing good value where Viton compatibility is required.

Frequently Asked Questions

Are these o-rings compatible with diesel and biodiesel?
Yes. The Viton compound is suitable for diesel and common biodiesel blends, as noted in the product compatibility list.

What is the usable temperature range for these o-rings?
The specified operating range is -26C (-15F) to 232C (450F), covering most automotive and light industrial scenarios.

Do the actual dimensions match nominal sizes?
The listed actual dimensions are 8.987 in ID and 9.193 in OD with a 0.103 in cross section, which aligns closely with the nominal 9 in ID and 9-3/16 in OD sizing.