153 Viton O-Ring 90A Durometer 3-1/2 in ID Pack of 25 - Durable Seal

In this review the Mr O-Ring 153 Viton O-Ring is evaluated for technicians, mechanics, and maintenance buyers who need a high-temperature, fuel-resistant seal in a standard AS568 size. The bottom line: this pack of 25 delivers consistent, factory-sized o-rings in a stiff 90A durometer that hold up where petroleum, hydraulic fluids, and high heat are present. For anyone replacing seals exposed to fuels, oils or elevated temperatures the primary reason to buy is the material performance of Viton FKM across a wide temperature range and its compatibility with common automotive and industrial fluids.

Key Features

• Material: Viton FKM composition gives strong resistance to petroleum products, fuels, and many chemicals, reducing premature seal failures.
• Hardness: 90A durometer provides a firmer seal that resists extrusion and maintains shape under compression in demanding applications.
• Pack size: Comes as a pack of 25 so service shops and hobbyists can replace multiple seals without frequent reorders.
• Temperature range: Rated from -26C (-15F) to 232C (450F), suitable for high-temperature engine and industrial environments.
• Size accuracy: Nominal AS568 size with actual dimensions close to spec for predictable fit in standard grooves.

Who It's For

This product suits professional mechanics, HVAC and hydraulic technicians, and industrial maintenance staff who need a reliable seal material that resists fuels, oils, and high temperatures. The pack quantity and standardized size make it practical for routine servicing and OEM replacement where AS568 dimensions are required.

Those who need very soft seals for ultra-low-pressure gasketing or food-grade elastomers should look elsewhere; Viton at 90A is intentionally firm and is not specified for potable water or food contact where regulatory grades are required.

Pros & Cons

Pros

• Excellent chemical and temperature resistance thanks to Viton, suitable for fuels, oils, and many solvents.
• Consistent sizing with actual dimensions near nominal for predictable installation.
• Bulk pack of 25 reduces downtime for shops replacing multiple seals.

Cons

• 90A hardness is relatively firm, which may be unsuitable where a softer sealing surface is needed.

Specifications

Our Verdict

The Mr O-Ring 153 Viton 90A is a solid choice for professionals needing a durable, heat- and fuel-resistant seal in a standard AS568 size; the pack of 25 is cost effective for routine maintenance and the material performance offers long service life in harsh environments.

Frequently Asked Questions

Are these o-rings compatible with gasoline and diesel?
Yes, Viton FKM is formulated to resist petroleum fuels including gasoline and diesel as well as many fuel blends.

Do the rings meet AS568 sizing?
Yes, the product is offered to AS568 size standards with actual dimensions provided to confirm fit.

What applications are best for 90A hardness?
90A is best where a firmer seal is required to resist extrusion and maintain shape under pressure and heat, common in hydraulic, fuel, and engine service.