274 Viton O-Ring 75A Durometer 10 in ID Pack of 10 - Durable Seal

In this review of the 274 Viton O-Ring, the bottom line is clear: this pack of ten OEM-style seals is best for technicians and hobbyists who need a heat- and chemical-resistant replacement O-ring for fuel, hydraulic, and sealing applications. The reviewer found the single biggest reason to buy is the material performance-Viton fluorocarbon elastomer rated to 400 degrees F delivers reliable resistance to fuels, aromatic and aliphatic hydrocarbons, and many solvents while retaining shape under pressure.

Key Features

• Material: Made of Viton fluorocarbon elastomer, the rings resist fuels and many aggressive chemicals so they last longer in demanding systems.
• Temperature range: Rated from -15 degrees F to 400 degrees F, the O-rings handle both low-temperature starts and high-heat operating conditions without rapid degradation.
• Durometer: A 75A shore hardness gives a firm yet flexible seal that resists penetration and maintains a tight fit on cylindrical overlaps.
• Cross-section: The round cross-section provides a consistent sealing surface between mating cylindrical parts for predictable leak control.
• Standards: Manufactured to match Aerospace Standard AS568A sizes, the dimensions are consistent with common replacement requirements.

Who It's For

This product suits maintenance techs, firearms and suppressor owners, fuel system mechanics, and anyone replacing worn seals in pumps and fittings who needs fuel and heat resistance. The pack of ten makes it practical for projects or keeping spares on hand for recurring maintenance.

Customers relying on compatibility with aggressive bases such as strong alkalis, ammonia gas, or glycol-based brake fluids should look elsewhere, because Viton is known to be vulnerable to those fluids and to super-heated steam. For very soft-sealing needs or extreme cold below the stated range, a different elastomer may perform better.

Pros & Cons

Pros

• Excellent chemical and fuel resistance for reliable use in fuel pumps and similar systems.
• Wide operating temperature range suitable for most industrial and field applications.
• Durable 75A hardness that keeps its shape and prevents extrusion under compression.
• Pack of ten offers good value and convenient spare parts supply.

Cons

• Not compatible with some low molecular weight organic acids, strong alkalis, or glycol-based brake fluids, which limits use in certain chemical environments.
• The relatively firm 75A hardness may be less forgiving in soft-seal or very low-pressure applications.

Specifications

Our Verdict

This pack of 274 Viton O-Rings is a practical, cost-effective choice for anyone needing reliable seals that resist fuels, solvents, and high heat. It is especially useful for fuel-system repairs, suppressor or barrel seals, and general maintenance where durability and chemical resistance matter. Buy it if you need dependable performance and spare parts on hand, but choose a different elastomer where compatibility with strong alkalis or glycol-based fluids is required.

Frequently Asked Questions

Are these O-rings suitable for fuel applications?
Yes. The Viton material is compatible with many fuels, aromatic and aliphatic hydrocarbons, and is commonly used in fuel system seals.

What size are the rings and how many come in a pack?
Each ring has a 10 in inner diameter, 10-1/4 in outer diameter, 1/8 in cross-section width, and the pack includes ten rings.

Will these work with brake fluid or ammonia?
No. Viton is vulnerable to glycol-based brake fluids and ammonia gas, so choose a different material for those chemicals.