Mr O-Ring 404 Viton O-Ring 90A Durometer 1-7/8in ID Pack of 10

In this review the Mr O-Ring 404 Viton O-Ring pack is examined for technicians, maintenance crews and home mechanics who need durable seals that resist fuels and high temperatures. The bottom line: these 90A durometer Viton o-rings offer broad chemical and thermal resistance, making them a practical choice when a dependable petroleum- and heat-resistant seal is required. The pack of 10 and AS568-compatible sizing mean an installer can keep spares on hand and expect consistent, serviceable parts.

Key Features

• Material: Viton (FKM) construction provides excellent resistance to fuels, oils and many organic solvents for longer seal life.
• Hardness: 90A durometer offers a firm cross-section that holds shape under compression and suits many static and low-dynamic sealing points.
• Temperature range: Rated from -26C (-15F) to 232C (450F), useful where both low temperature flexibility and high temperature stability are required.
• Size accuracy: Nominal and actual dimensions are listed for reliable fit: 1-7/8in ID nominal with actual 1.850in ID and 0.275in cross-section for predictable installation.
• Chemical compatibility: Performs well with petroleum products, diesel, biodiesel blends, methanol/ethanol blends, mineral oil and many chemicals for broad application.
• Pack quantity: Supplied as a pack of 10 so technicians can replace multiple seals or keep spares without buying large bulk quantities.

Who It's For

The Mr O-Ring 404 Viton is aimed at professionals and experienced DIYers who need a resilient o-ring for fuel, oil, hydraulic or industrial equipment where heat and chemical resistance matter. It is especially suited to automotive fuel systems, fuel pumps, and hydraulic fittings that require an AS568-equivalent size and a firmer 90A compound.

Those looking for very soft, highly elastic seals for delicate low-pressure applications or for food-grade or FDA-certified elastomers should look elsewhere, since this is a general-purpose Viton (FKM) material optimized for chemical and temperature resistance rather than softness or food compliance.

Pros & Cons

Pros

• Excellent resistance to fuels, oils and many organic solvents, extending service life in harsh environments.
• Wide temperature range from -26C to 232C covers many industrial and automotive needs.
• 90A durometer gives a stable seal that resists extrusion and compression set in demanding conditions.
• Pack of 10 provides good value for installers and maintenance crews who need multiple replacements.

Cons

• 90A hardness may be too stiff for some low-pressure or soft-sealing applications where a lower durometer is preferred.
• Not marketed as food-grade or FDA-approved, so it is not suitable for regulated food or medical uses.

Specifications

Our Verdict

The Mr O-Ring 404 Viton 90A pack is a practical, cost-effective option for anyone needing reliable chemical and high-temperature resistance in AS568-equivalent sizes. Installers and maintenance professionals will appreciate the consistent sizing and pack quantity; buy this if you need durable fuel- and oil-resistant seals, but choose a softer compound if your application requires a lower durometer or food-grade certification.

Frequently Asked Questions

Are these o-rings compatible with gasoline and diesel?
Yes, Viton (FKM) is compatible with petroleum products including gasoline, diesel and many fuel blends.

Do the listed dimensions match AS568 sizing?
The product is provided as an AS568 size equivalent with both nominal and actual dimensions listed to aid fit selection.

Can these be used at very low temperatures?
They are rated down to -26C (-15F), suitable for many low-temperature applications but not for extreme cryogenic use.