152 Viton O-Ring 75A Durometer 3-1/4 in ID - Pack of 25

In this review the 152 Viton O-Ring proves itself as a workhorse for technicians, hobbyists, and maintenance crews who need reliable seals for harsh environments; the single biggest reason to buy is its combination of chemical and heat resistance provided by the Viton material, which makes it suitable for fuel, aromatic and aliphatic hydrocarbon exposure up to 400 degrees F. The reviewer found these rings are well sized for common cylindrical seals and noted they are sold in a practical pack of 25, making replacements and routine service straightforward and cost effective.

Key Features

• Material: Viton fluorocarbon elastomer provides strong resistance to fuels, many solvents, ozone and weathering for long service life.
• Temperature range: Usable from -15 degrees F to 400 degrees F, which covers most automotive, industrial and outdoor applications.
• Hardness: 75A durometer offers a balance of flexibility and resistance to penetration for durable sealing under pressure.
• Form factor: Round cross-section is designed to seal between overlapping cylindrical surfaces, making it suitable for connectors and bottle seals.
• Compatibility: Acceptable with non-flammable hydraulic fuels, silicone oils, aromatic and aliphatic hydrocarbons and high vacuum systems, expanding its usable environments.
• Pack quantity: Supplied in a pack of 25, which reduces downtime for maintenance and provides spares for multiple applications.

Who It's For

The 152 Viton O-Ring is best for mechanics, equipment technicians, and DIYers who service fuel systems, pneumatic fittings, or hydraulic components and need an o-ring with proven chemical and heat resistance. It is especially useful where repeated replacement is expected, since the pack size keeps per-unit cost low and simplifies inventory for routine maintenance.

Those who should look elsewhere include users who require compatibility with low molecular weight organic acids, ammonia gas, strong alkalis, amines, glycol-based brake fluids, or super-heated steam, as Viton is vulnerable to those chemicals and conditions. Also, if a softer shore hardness is needed for very low-pressure static seals, a lower durometer compound would be a better choice.

Pros & Cons

Pros

• Good fit and durability for common applications, with customers reporting successful replacements in fuel bottles and barrel seals.
• Wide operational temperature window and strong resistance to fuels and many solvents.
• Pack of 25 offers strong value and reduces trips to reorder small quantities.
• Round cross-section and 75A hardness maintain leak resistance under typical service conditions.

Cons

• Not compatible with certain chemicals like ammonia, strong alkalis, some amines, glycol-based brake fluids and super-heated steam.
• 75A hardness may be firmer than desired for very low-pressure static sealing where a softer o-ring would conform better.

Specifications

Our Verdict

The 152 Viton O-Ring is a practical, cost-effective choice for anyone needing reliable fuel and chemical resistant seals at elevated temperatures. With a 75A hardness and a wide compatibility profile for hydrocarbons and many solvents, it is an excellent replacement part for maintenance routines and specific equipment seals, offering clear value when the listed incompatibilities are not a factor.

Frequently Asked Questions

Are these o-rings suitable for fuel applications?
Yes, Viton is compatible with many fuels and aromatic and aliphatic hydrocarbons, making these rings suitable for many fuel-related seals.

What size are these o-rings?
The set is specified as 3-1/4 in inner diameter, 3-7/16 in outer diameter, and 3/32 in cross-section width.

Can these be used with brake fluid or ammonia?
No, Viton is vulnerable to glycol-based brake fluids and ammonia gas, so avoid those environments.