Mr O-Ring 5X415 Metric Viton O-Ring 75A Durometer - Reliable Seal

In this review the Mr O-Ring 5X415 Metric Viton O-Ring is evaluated for technicians and hobbyists who need a durable, high-temperature sealing solution. The bottom line: this single-pack Viton o-ring is best for demanding fluid and temperature environments because it combines a 75A durometer with a wide working temperature range and strong chemical resistance, making it a practical choice when a reliable rubber seal is required. The review focuses on real-world sealing performance and the core specs that determine compatibility.

Key Features

• Material: Viton (FKM) provides excellent resistance to high temperature, ozone and many chemicals used in industrial and automotive systems.
• Temperature Range: Rated from -26C to 232C, it handles extreme cold starts and sustained high-temperature service without rapid degradation.
• Durometer: The 75A hardness balances flexibility and compression resistance for dependable static and dynamic sealing in many housings.
• Exact Dimensions: Metric 415 mm ID, 425 mm OD, 5 mm cross-section ensure predictable fit where those nominal sizes are required.
• Chemical Compatibility: Suitable for petroleum fuels, diesel blends, mineral oils, greases and many organic solvents commonly encountered in maintenance work.
• Shelf-life: No practical shelf-life limit, so spares can be stocked without concern for expiry.

Who It's For

This o-ring is aimed at professionals and experienced DIYers replacing seals in engines, pumps, valves and other equipment exposed to fuels, oils and higher temperatures. Its combination of Viton chemistry and 75A hardness makes it appropriate for hydraulic systems, fuel systems using methanol/ethanol blends, and industrial equipment requiring long-term ozone and heat resistance.

Those who should look elsewhere include users needing a very soft, low-durometer seal for delicate compression or applications below -26C, or anyone requiring metric sizes other than the 415 mm ID/425 mm OD nominal dimensions supplied in this pack of one.

Pros & Cons

Pros

• Excellent high-temperature and chemical resistance from Viton material for demanding environments.
• 75A durometer offers a useful middle ground between flexibility and sealing force for many static and rotating seals.
• Accurate metric dimensions reduce guesswork when replacing existing o-rings or ordering spares.
• Unlimited shelf-life simplifies long-term maintenance inventory management.

Cons

• Sold as a single o-ring, which may not suit projects that need multiples unless ordered in quantity.
• Not suitable for applications below -26C or where a much softer material is required.

Specifications

Material	Viton (FKM)
Durometer	75A
Metric Dimensions	415 mm ID x 425 mm OD x 5 mm CS
Actual Imperial Dimensions	16.339 in ID x 16.732 in OD x 0.197 in CS
Temperature Range	-26C (-15F) to 232C (450F)
Color	Black
Package Quantity	Pack of 1

Our Verdict

The Mr O-Ring 5X415 is a sensible, value-oriented choice for repair shops and maintenance teams that need a durable, chemically resistant metric o-ring in a mid-range durometer. It is best for applications exposed to fuels, oils and elevated temperatures where precise metric sizing matters. Buyers who need multiple pieces or lower-temperature performance should plan accordingly, but for one-off replacements this o-ring delivers dependable sealing and long-term storage peace of mind.

Frequently Asked Questions

Is this o-ring compatible with gasoline and diesel?
Yes, Viton is compatible with petroleum products including gasoline and diesel and their common blends as noted in the material description.

Can this o-ring be used in very low temperature climates?
The rated lower limit is -26C (-15F); for colder applications a different elastomer with better low-temperature flexibility should be chosen.

Does the pack include multiple rings?
No, this listing is a pack of one o-ring, so order multiple if more than one seal is required.