Mr O-Ring 464 Viton O-Ring 90A Durometer 17-1/2ft ID - Durable Seal

In this review the Mr O-Ring 464 Viton O-Ring is evaluated for technicians and hobbyists who need a high-temperature, chemical-resistant seal for engines, pumps, or industrial equipment. The bottom line: this single-pack Viton o-ring stands out because of its wide temperature range and compatibility with fuels, oils and many solvents, making it a reliable choice where resistance to heat, ozone and hydrocarbons matters most.

Key Features

• Material: The Viton (FKM) compound provides excellent resistance to high temperature and many chemicals, so seals last longer in harsh environments.
• Hardness: The 90A durometer offers a firm cross-section that maintains sealing performance under compression and repeated use.
• Sizing: Nominal dimensions 17-1/2' ID, 18' OD and 1/4' cross-section match AS568 size expectations for easy replacement.
• Temperature range: Rated from -26C (-15F) to 232C (450F), the o-ring works in both cold starts and very high temperature systems.
• Chemical compatibility: Performs well with petroleum, diesel and biodiesel blends, methanol or ethanol blends, mineral and silicone oils, and many organic solvents.
• Shelf life: Stated as unlimited, so spare parts can be stocked without concern for expiration.

Who It's For

The 464 Viton o-ring is aimed at professionals and serious DIYers who need a dependable seal for engines, fuel systems, hydraulic or pneumatic fittings exposed to high heat, fuels or aggressive fluids. Its firm 90A hardness and FKM chemistry make it a good match for applications where a softer elastomer would swell or degrade.

Those seeking a very soft gasket for low-pressure, low-temperature consumer uses or who require metric-only sizing might look elsewhere; this listing is specific to the AS568-style nominal dimensions and a single-piece, firm Viton construction.

Pros & Cons

Pros

• Excellent chemical and high-temperature resistance extends service life in demanding environments.
• Accurate nominal and actual dimensions make it a straightforward replacement for AS568 size fittings.
• 90A durometer provides durable sealing under compression and repeated cycles.

Cons

• Higher durometer means it is stiffer than softer o-rings and may not be ideal for very low-pressure or delicate sealing surfaces.

Specifications

Brand	Mr O-Ring
Material	Viton (FKM), 90A durometer
Nominal dimensions	17-1/2' ID, 18' OD, 1/4' CS
Actual dimensions	17.455' ID, 18.005' OD, 0.275' CS
Metric dimensions	443.36 mm ID, 457.34 mm OD, 6.99 mm CS
Temperature range	-26C (-15F) to 232C (450F)

Our Verdict

For anyone who needs a robust, chemically resistant o-ring for fuel systems, hydraulic components or high-temperature seals, this 464 Viton 90A o-ring is a practical, cost-effective choice. Its accurate sizing and wide compatibility make it worth stocking as a replacement part for industrial and automotive maintenance.

Frequently Asked Questions

Is this o-ring compatible with diesel and biodiesel?
Yes, the Viton FKM compound is specified to perform well with diesel and biodiesel blends.

What temperature range will this o-ring tolerate?
The o-ring is rated from -26C (-15F) up to 232C (450F) for high and low temperature applications.

Does the listed size follow AS568 standards?
The product is offered to match AS568-style sizing with nominal and actual dimensions provided for straightforward replacement.