Mr O-Ring 383 Viton O-Ring 90A Durometer, 14 in ID - Durable Seal

In this review the Mr O-Ring 383 Viton O-Ring is assessed for technicians and maintenance professionals who need a heat- and chemical-resistant seal. The bottom line: this single-pack Viton o-ring stands out for its high-temperature tolerance and broad chemical compatibility, making it a straightforward choice when a reliable sealing element is required. The reviewer found the 90A durometer construction and close actual dimensions deliver a good balance of hardness and sealing compression for common industrial uses.

Key Features

• Material: Made from Viton (fluorocarbon rubber), it resists fuels, oils and many solvents so it holds up where general-purpose rubbers fail.
• Temperature range: Rated from -26C to 232C, the o-ring tolerates very high temperatures and sub-freezing conditions for wider application use.
• Durometer: The 90A hardness provides a firm cross-section that helps maintain sealing pressure under moderate extrusion and compression.
• Dimensional accuracy: Nominal and actual dimensions are provided so installers can verify fit: 14 in ID nominal with measured 13.975 in actual ID for predictable performance.
• Chemical compatibility: Performs well with petroleum, diesel blends, biodiesel, methanol or ethanol blends, and many industrial oils and greases for versatile service.
• Standards: Sized to AS568 conventions, which simplifies replacement and compatibility with standard o-ring grooves and housings.

Who It's For

Maintenance technicians, HVAC and hydraulic system installers, and equipment rebuilders who regularly work with fuels, oils or high-temperature systems will appreciate this Viton o-ring. Its 90A hardness and broad chemical resistance suit static and low-dynamic sealing points where fuel or oil exposure is expected.

Those needing very soft seals for low compression applications or specialized elastomers (for extreme low-temperature flexibility beyond -26C) should consider alternate compounds. Also consider multi-packs if frequent replacements are anticipated, since this listing is a pack of 1.

Pros & Cons

Pros

• Excellent chemical resistance to fuels, oils and many solvents, reducing seal failures in harsh fluids.
• High maximum temperature rating to 232C makes it suitable for hot-air and high-heat applications.
• 90A durometer gives a robust, durable seal for many industrial interfaces without excessive deformation.
• Provided actual and metric dimensions help confirm correct fit before installation.

Cons

• At 90A hardness the o-ring is relatively firm, which may be less suitable where very soft compression is required.
• Sold as a single-pack which may be inconvenient for users who prefer multi-packs for routine maintenance.

Specifications

Material	Viton (FKM)
Durometer	90A
Nominal dimensions	14 in ID, 14-3/8 in OD, 3/16 in CS
Actual dimensions	13.975 in ID, 14.395 in OD, 0.210 in CS
Metric dimensions	354.97 mm ID, 365.63 mm OD, 5.33 mm CS
Temperature range	-26C (-15F) to 232C (450F)
Pack size	Pack of 1

Our Verdict

The Mr O-Ring 383 Viton o-ring is a practical, dependable option for professionals who need a heat- and chemical-resistant seal in fuel, oil or high-temperature applications. Its 90A hardness and clear dimensional data make fitting predictable, and while a single-pack may not suit high-volume users, it represents good value for targeted repairs and replacements where performance under heat and aggressive fluids matters.

Frequently Asked Questions

Is this o-ring suitable for fuel systems?
Yes. Viton FKM is compatible with many petroleum fuels and diesel blends, making it suitable for many fuel system sealing points.

Will it withstand high temperatures?
Yes. The specified operating range goes up to 232C (450F), so it tolerates very high temperature exposure in many applications.

Does the size match AS568 standards?
Yes. The product is offered to AS568 sizing conventions with both nominal and actual dimensions listed for verification.