Mr O-Ring 458 Viton O-Ring 90A Durometer 14-1/2 in ID - Durable Seal

In this review the Mr O-Ring 458 Viton O-Ring is evaluated for durability and sealing performance in demanding environments. The bottom line: this single-pack Viton o-ring is aimed at technicians, maintenance crews, and hobbyists who need a high-temperature, fuel-resistant seal in a specific AS568 size; its biggest reason to buy is the combination of a 90A durometer compound and broad chemical resistance that copes with fuels, oils and high-temperature air. The review shows where it excels and where users should be cautious when selecting hard durometer seals.

Key Features

• Material: The Viton (FKM) compound offers strong resistance to fuels, mineral oils and many organic solvents so the ring holds up in petroleum and chemical exposures.
• Durometer: The 90A hardness provides a stiff, wear-resistant seal that maintains shape under compression and thermal cycling for reliable service.
• Size accuracy: Nominal and actual dimensions are supplied so installers can verify fit: 14-1/2 in ID (actual 14.475 in) and 15 in OD (actual 15.025 in) for predictable installation.
• Temperature range: Rated from -26C (-15F) to 232C (450F) so the o-ring works across a wide span of cold starts and very high operating temperatures.
• Chemical versatility: Performs well with diesel, biodiesel blends, methanol or ethanol blends and silicone greases, making it useful in fuel systems and lubrication seals.
• Shelf life: Effectively unlimited shelf-life simplifies inventory for shops and minimizes waste when spare rings are kept on the shelf.

Who It's For

This o-ring suits industrial maintenance technicians, marine and automotive professionals, and anyone sealing equipment exposed to fuels, hydraulic fluids or elevated temperatures. Its 90A hardness and Viton chemistry are particularly useful where oil and fuel resistance plus thermal stability are required.

Those looking for a softer, more flexible seal for low-pressure or dynamic shaft sealing should look at lower durometer elastomers; similarly, if exact metric sizing or non-Viton elastomers are required for extreme cold beyond -26C, choose a material matched to that environment.

Pros & Cons

Pros

• Excellent chemical resistance to fuels, oils and many solvents for long-lasting seals in harsh fluids.
• Wide temperature capability up to 232C (450F) for use near high-heat sources.
• Accurate actual dimensions listed so fit checks are straightforward before installation.
• Durable 90A durometer gives wear resistance and shape retention under compression.

Cons

• 90A hardness can be too stiff for low-pressure dynamic applications or where extreme conformability is required.
• Pack of 1 may not suit users needing multiple spares or frequent replacement without buying larger packs.

Specifications

Material	Viton (FKM)
Durometer	90A
Nominal ID	14-1/2 in
Nominal OD	15 in
Cross section	1/4 in
Actual dimensions	14.475 in ID, 15.025 in OD, 0.275 in CS
Temperature range	-26C (-15F) to 232C (450F)

Our Verdict

The Mr O-Ring 458 Viton o-ring is a practical choice for professionals who need a heat- and fuel-resistant seal in a common AS568 size; its 90A durometer and accurate actual dimensions make it reliable for static seals and high-temperature applications. It represents good value when a durable, chemically resistant o-ring is required, though buyers needing softer, highly flexible seals should consider alternative durometers.

Frequently Asked Questions

Is this o-ring compatible with gasoline and diesel?
Yes, the Viton compound performs well in petroleum products including diesel and typical fuel blends.

Will the 90A hardness work for dynamic shaft seals?
The 90A durometer is fairly stiff and best for static or low-movement seals; for dynamic shaft applications a softer durometer may be preferable.

Do the listed dimensions match actual sizes for installation?
Yes, actual dimensions are provided (14.475 in ID, 15.025 in OD, 0.275 in CS) to help verify fit before installation.