Mr O-Ring 326 Viton O-Ring 90A 1-5/8 in ID 2 in OD Pack of 25

In this review the Mr O-Ring 326 Viton O-Ring is evaluated for workshop and industrial sealing tasks where chemical resistance and high temperature performance matter. The bottom line: this 90A durometer Viton o-ring in a pack of 25 is best for technicians, mechanics, and fabricators who need reliable resistance to fuels, oils and high temperatures. Its nominal AS568-consistent sizing and actual measured dimensions make it a dependable choice when replacing aging seals or stocking maintenance kits.

Key Features

• Material: Viton (FKM) provides outstanding resistance to high temperatures, ozone and many organic solvents, reducing premature failures in harsh environments.
• Durometer: The 90A hardness gives a firm seal that resists extrusion and deformation under pressure, useful where a stiffer seal is required.
• Dimensions: Nominal 1-5/8 in ID and 2 in OD with actual measurements of 1.600 in ID, 2.020 in OD, 0.210 in cross-section to match common AS568 sizes for easy replacement.
• Chemical compatibility: Performs well with petroleum products, diesel blends, methanol or ethanol blends and many oils, making it versatile for fuel and hydraulic systems.
• Temperature range: Rated from -26C (-15F) to 232C (450F) so it handles cold starts and sustained high heat applications without rapid degradation.
• Pack quantity: Supplied as a pack of 25, which is convenient for maintenance shops or bulk stocking of common sizes.

Who It's For

This product suits industrial maintenance technicians, small engine mechanics and hobbyists who work on fuel systems, hydraulic equipment or any application exposed to oils and fuels. The 90A hardness and Viton compound are particularly valuable where higher temperature stability and chemical resistance are required compared with general-purpose elastomers.

Those who need softer, more flexible seals for low-pressure or delicate compression fittings should look at lower durometer materials. Also, if your application requires FDA food-grade or very low-temperature elastomers below -26C, select a material specifically rated for those conditions instead.

Pros & Cons

Pros

• Excellent chemical and high-temperature resistance from the Viton FKM compound.
• Accurate actual dimensions and AS568-compatible nominal size make replacements straightforward.
• Pack of 25 offers good value for maintenance stores and repeat repair work.

Cons

• 90A hardness is relatively firm, which may not be ideal for applications needing a softer, more compliant seal.

Specifications

Brand	Mr O-Ring
Material	Viton (FKM)
Durometer	90A
Nominal dimensions	1-5/8 in ID, 2 in OD, 3/16 in CS
Actual dimensions	1.600 in ID, 2.020 in OD, 0.210 in CS
Temperature range	-26C (-15F) to 232C (450F)
Pack quantity	25 pieces

Our Verdict

The Mr O-Ring 326 Viton 90A o-ring is a practical choice for professionals who need a durable, chemically resistant seal at elevated temperatures. Packaged in quantities of 25 and sized to AS568 conventions, it offers good value and reliability for fuel, oil and hydraulic service; choose a lower durometer material only if a softer seal is required for your specific application.

Frequently Asked Questions

Are these o-rings compatible with fuel blends?
Yes. The Viton compound is rated for petroleum products, gasoline and diesel blends, including blends with methanol or ethanol.

Do the actual dimensions match the labeled size?
The product lists both nominal and actual dimensions (1.600 in ID, 2.020 in OD, 0.210 in CS) to ensure a close fit with AS568 sizing.

What is the usable temperature range?
The specified range is -26C (-15F) to 232C (450F), suitable for most automotive and industrial high-temperature applications.