244 Viton O-Ring 75A Durometer 4-1/4 in ID 4-1/2 in OD - Reliable Seal

In this review the 244 Viton O-Ring is presented for technicians, maintenance crews, and hobbyists who need a durable replacement seal. The bottom line: it is best for applications that require chemical and heat resistance because its fluorocarbon compound and 75A hardness combine to resist fuels, oils, ozone and high temperatures while providing a tight seal. The reviewer found these O-rings to be straightforward replacements for common cylindrical overlaps and praised their consistent sizing and leak resistance in real-world use.

Key Features

• Material: Viton fluorocarbon elastomer delivers strong resistance to fuels, aromatic and aliphatic hydrocarbons and many chemicals so seals last longer in aggressive environments.
• Temperature range: Rated from -15 degrees F to 400 degrees F so the O-ring can be used in both cold startup and sustained high-heat applications.
• Durometer: 75A hardness provides a balance of flexibility and resistance to penetration for reliable sealing under compression.
• Shape and fit: The round cross-section is designed to form a reliable seal between cylindrical overlapping surfaces, making it suitable as a direct replacement for common hardware and bottle seals.
• Standards: Conformance to Aerospace Standard AS568A means sizing follows widely used specifications for interchangeability and predictable performance.

Who It's For

The 244 Viton O-Ring is aimed at industrial and field technicians, firearm and suppressor owners replacing barrel and switch seals, hydraulic system maintainers, and anyone needing a fuel- and chemical-resistant seal in pumps or fittings. Customers replacing MSA fuel bottle seals or Remington 1100 barrel seals will find the size and hardness appropriate for those tasks.

Those who should look elsewhere include applications that expose seals to concentrated low molecular weight organic acids, strong alkalis, ammonia gas, or glycol-based brake fluids, and systems requiring resistance to super-heated steam; in those cases a different elastomer or specialty material is advisable.

Pros & Cons

Pros

• Excellent heat and fuel resistance from the fluorocarbon compound, which customers noted held up under elevated temperatures.
• Consistent sizing that fits common replacement needs and reduces leakage in assemblies noted by users.
• Good value in the pack quantity for routine maintenance and multiple repairs.

Cons

• Not compatible with certain chemicals like low molecular organic acids, amines, and glycol-based brake fluids, so chemical compatibility must be checked before use.

Specifications

Material	Viton (fluorocarbon elastomer)
Color	Black
Inner diameter (ID)	4-1/4 in
Outer diameter (OD)	4-1/2 in
Cross-section width	1/8 in
Durometer	75A
Temperature range	-15 degrees F to 400 degrees F

Our Verdict

The 244 Viton O-Ring is a practical and cost-effective choice for users who need a chemically and thermally robust seal for fuel systems, hydraulic fittings, and common cylindrical joints. Its 75A hardness and AS568A sizing make it a dependable replacement option, offering solid value for routine maintenance while requiring care in environments with incompatible chemicals.

Frequently Asked Questions

Is this O-ring suitable for fuel applications?
Yes. The Viton material is compatible with many fuels and aromatic and aliphatic hydrocarbons, making it suitable for non-flammable hydraulic fuels and similar uses.

What temperatures can this O-ring handle?
The material is rated for use from -15 degrees F up to 400 degrees F, suitable for most cold and high-heat sealing tasks.

Will it fit standard AS568A grooves?
Yes. The ring meets AS568A sizing conventions so it is intended to match common groove dimensions for the listed ID and cross-section.