277 Viton O-Ring 75A Durometer 11-1/2 in ID Pack of 5 - Chemical

In this review the 277 Viton O-ring is examined for workshop and maintenance users who need a small pack of reliable seals that tolerate heat and aggressive fuels. The bottom line: this pack of five O-rings delivers consistent sealing performance where fuel, solvents, or elevated temperatures are present. The reviewer found these rings work well across typical plumbing, fuel system and suppressor applications because they are made from Viton fluorocarbon, hold their shape at high temperature, and come in a useful size for many cylindrical seals.

Key Features

• Material: Made from Viton fluorocarbon elastomer, the compound resists many fuels and chemicals so it lasts longer in contact with hydrocarbons.
• Temperature range: Rated from -15 degrees F to 400 degrees F, these O-rings remain elastic across wide operating conditions for both hot and cold environments.
• Durometer: The 75A hardness balances flexibility and puncture resistance to provide a durable seal without excessive stiffness.
• Cross-section shape: The round cross-section is ideal for sealing between overlapping cylindrical surfaces and creates a predictable compression profile.
• Standards: Manufactured to the AS568A sizing standard for consistent fit in common grooves and housings.

Who It's For

This product is best for technicians, hobbyists, and maintenance staff who replace O-rings in fuel pumps, small hydraulic components, suppressors, or bottles that require chemical resistance and heat tolerance. The pack of five gives a few spare parts for repeated small repairs without buying a large spool.

Those needing compatibility with strong alkalis, ammonia, or glycol-based brake fluids should look for a different elastomer, since Viton is vulnerable to those media. Also, if a softer, more pliable seal is needed for very low-pressure seals, a lower durometer material may be preferable.

Pros & Cons

Pros

• Excellent resistance to fuels and aromatic hydrocarbons so rings perform well in fuel system and engine-adjacent uses.
• Wide usable temperature range that sustains sealing properties from subzero to high heat applications.
• 75A hardness provides durable puncture and extrusion resistance while maintaining a good seal with standard grooves.

Cons

• Not compatible with certain chemicals such as low molecular weight organic acids, ammonia, alkalis and glycol-based brake fluids, which limits use in some automotive or industrial fluids.

Specifications

Our Verdict

The 277 Viton O-ring pack of five is a practical choice for anyone needing reliable seals exposed to fuels, solvents, or elevated temperatures; it balances durability and flexibility and follows industry sizing standards so it fits many common applications, making it good value for routine maintenance and repairs.

Frequently Asked Questions

Are these O-rings fuel compatible?
Yes, Viton is compatible with many fuels and aromatic and aliphatic hydrocarbons, making these O-rings suitable for fuel system components.

What temperature range will they withstand?
They are rated for use from -15 degrees F up to 400 degrees F, appropriate for a wide variety of hot and cold environments.

Do they resist all chemicals?
No, Viton is vulnerable to low molecular organic acids, ammonia, alkalis, amines and glycol-based brake fluids, so avoid those media.