Mr O-Ring 401 Viton O-Ring 90A 1-1/2 in ID Pack of 10 - High Temp Seal

In this review the Mr O-Ring 401 Viton O-Ring is presented for technicians, hobbyists and maintenance teams who need a compact supply of high-temperature, fuel-resistant seals. The bottom line: this pack of 10 Viton o-rings stands out for its high chemical and heat resistance and consistent dimensions, making it a reliable choice where petroleum, diesel blends or silicone fluids are present. The reviewer found the 90A durometer material and the close actual dimensions useful for replacement and preventative maintenance tasks where durability under elevated temperatures matters.

Key Features

• Material: FKM Viton construction provides strong resistance to fuels, oils and many organic solvents, reducing seal failure in aggressive media.
• Temperature range: Rated from -26C to 232C so the rings tolerate very high operating temperatures encountered in engines and industrial equipment.
• Durometer: 90A hardness offers a firm seal that resists extrusion and compression set in demanding applications.
• Pack quantity: Ten rings per pack gives spare parts on hand for routine service or small repair jobs without frequent reordering.
• Size accuracy: Actual dimensions closely match nominal sizes, easing selection and replacement for components specified to AS568 standards.
• Versatility: Performs well with petroleum, methanol or ethanol blends, diesel or biodiesel blends, and many greases and oils for broad use.

Who It's For

The Mr O-Ring 401 Viton is aimed at professionals and serious DIYers who need a reliable seal that withstands high temperature and exposure to fuels and oils. It is especially useful for engine maintenance, fuel system repairs and industrial equipment where a firm 90A durometer is desirable.

Those who should look elsewhere include users needing a softer, more compressible o-ring for low-pressure water fittings or applications outside the specified chemical compatibility, or customers who require sizes outside the AS568 range offered here.

Pros & Cons

Pros

• Excellent chemical resistance to fuels, oils and many solvents, extending seal life in harsh environments.
• Wide temperature range that supports high-temp service up to 232C, suitable for engine and industrial use.
• Consistent actual dimensions (1.475 in ID, 2.025 in OD, 0.275 in CS) simplify replacements against nominal sizes.
• Pack of 10 provides ready spares for maintenance without frequent repurchase.

Cons

• 90A durometer is relatively firm and may be too hard for low-pressure or fine tolerance sealing requiring softer materials.

Specifications

Brand	Mr O-Ring
Model	401 Viton O-Ring
Material	Viton (FKM)
Durometer	90A
Nominal dimensions	1-1/2 in ID x 2 in OD x 1/4 in CS
Actual dimensions	1.475 in ID, 2.025 in OD, 0.275 in CS
Temperature range	-26C (-15F) to 232C (450F)

Our Verdict

The Mr O-Ring 401 Viton 90A in a pack of 10 is a practical, cost-effective choice for anyone needing durable, high-temperature seals compatible with fuels and many oils. It is good value where a firm durometer and chemical resistance are priorities, though users needing softer seals should choose a different material.

Frequently Asked Questions

Are these o-rings compatible with diesel and biodiesel?
Yes, the Viton material is listed as performing well with diesel and diesel blended with biodiesel.

Do the rings meet standard sizes for replacements?
Yes, these rings conform to AS568 size standards and the actual dimensions closely match the nominal size for straightforward replacement.

Can these be used at high temperatures?
Yes, they are rated to 232C (450F) and are suitable for high temperature applications within that limit.