Mr O-Ring 330 Viton O-Ring 90A 2-1/8in ID 2-1/2in OD Pack of 25

In this review the Mr O-Ring 330 Viton O-Ring (90A) is evaluated for workshop and industrial users who need reliable sealing across fuels, oils and high temperatures. The bottom line: this pack of 25 o-rings is best for maintenance technicians, hydraulic and fuel system repair professionals, and hobbyists who value high-temperature and chemical resistance. The reviewer found the Viton compound and the tight dimensional tolerance make these o-rings a dependable replacement part when working with petroleum products, biodiesel blends, silicone oils or hot air applications.

Key Features

• Material: The Viton (FKM) compound offers broad chemical resistance, so seals hold up against fuels, mineral oils and many organic solvents.
• Durometer: The 90A hardness provides a firm sealing surface that resists extrusion and maintains shape under compression.
• Temperature range: Rated from -26C to 232C (-15F to 450F), it performs in both cold startup and very high temperature service.
• Size accuracy: Nominal and actual dimensions are listed so installers can match the 2-1/8in ID and 2-1/2in OD ring precisely for AS568 size applications.
• Pack quantity: Supplied as a pack of 25, making it convenient for service kits, routine maintenance or multiple installations.
• Shelf life: Effectively unlimited shelf-life lets shops stock spares without concern for accelerated degradation.

Who It's For

This product is aimed at professionals and advanced DIYers who need a small-batch supply of a high-performance o-ring for seals exposed to fuels, hydraulic fluids, silicone oils or high temperatures. The chemical compatibility and wide temperature range make it suitable for fuel systems, pumps, high vacuum setups and outdoor equipment exposed to ozone and weather.

Those who should look elsewhere include users who require a softer compound for low-pressure static seals or food-grade elastomers; Viton is not formulated for food contact and its 90A hardness is firmer than elastomers designed for cushioning or very low-pressure sealing.

Pros & Cons

Pros

• Excellent chemical and high-temperature resistance from the Viton (FKM) formulation.
• Accurate actual dimensions provided (2.100in ID, 2.520in OD, 0.210in CS) for confident replacements.
• Pack of 25 offers value for maintenance and multiple repairs.
• Unlimited shelf-life reduces waste and inventory turnover concerns.

Cons

• 90A hardness is relatively firm, so it may not seal as well in some low-pressure or delicate flange applications.

Specifications

Brand	Mr O-Ring
Material	Viton (FKM)
Durometer	90A
Nominal Dimensions	2-1/8in ID, 2-1/2in OD, 3/16in CS
Actual Dimensions	2.100in ID, 2.520in OD, 0.210in CS
Temperature Range	-26C (-15F) to 232C (450F)
Pack Quantity	25

Our Verdict

The Mr O-Ring 330 Viton O-Ring (90A) is a practical and cost-effective choice for technicians and shops that require durable, chemically resistant seals. With precise dimensions, a wide temperature window and a 25-piece pack, it delivers dependable performance for fuel, oil and high-temperature sealing tasks and represents good value for routine maintenance inventories.

Frequently Asked Questions

Are these o-rings compatible with diesel and biodiesel blends?
Yes, Viton is formulated to perform well with diesel and biodiesel blends as well as many petroleum products.

Can these o-rings be used at high temperatures?
Yes, they are rated to 232C (450F), making them suitable for many high-temperature sealing applications.

Do these meet standard size specifications?
Yes, they are manufactured to match AS568 size standards and actual measurements are provided for verification.