254 Viton O-Ring 75A Durometer 5-1/2 in ID 5-3/4 in OD - Pack of 100

In this review of the 254 Viton O-ring pack, the bottom line is simple: this kit is for technicians and hobbyists who need reliable, heat- and chemical-resistant replacement seals in bulk. The reviewer found these O-rings offer consistent dimensions and a durable material profile that holds up under high temperatures and exposure to many fuels and solvents. If you need a ready supply for maintenance, plumbing, or fuel system repairs, this pack delivers the single biggest benefit - dependable sealing performance across a wide service temperature range.

Key Features

• Material: Made from Viton fluorocarbon elastomer to provide strong resistance to fuels, aromatic and aliphatic hydrocarbons, and many solvents.
• Temperature range: Rated for use from -15 degrees F to 400 degrees F, which supports high-heat applications and cold storage scenarios.
• Durometer: A 75A hardness that balances flexibility and resistance to penetration for durable sealing under compression.
• Form factor: Round cross-section sized 5-1/2 in ID and 5-3/4 in OD with a 1/8 in width to seal overlapping cylindrical surfaces effectively.
• Quantity: Pack of 100 provides a cost-effective supply for repeated replacements or multiple assemblies.
• Standards: Conforms to Aerospace Standard AS568A sizing conventions for interchangeability with common O-ring applications.

Who It's For

This pack suits industrial maintenance crews, small machine shops, and homeowners who perform routine seal replacements on fuel bottles, hydraulic fittings, or devices exposed to heat and chemical contact. The high-temperature capability and chemical compatibility make it a practical choice for fuel system service and some laboratory or vacuum setups.

Those who should look elsewhere include users needing full compatibility with strong alkalis, ammonia, or glycol-based brake fluids, and applications requiring food-grade elastomers or very soft seals; Viton is vulnerable to certain amines, low molecular organic acids, and super-heated steam.

Pros & Cons

Pros

• Excellent heat and fuel resistance that keeps seals effective in elevated temperatures.
• Consistent sizing that customers report fits common parts like MSA fuel bottles and certain firearm seals.
• Good value for money when buying replacements in bulk, with proven leak resistance in customer reports.
• Durable 75A hardness balances wear resistance and sealing ability for many mechanical joints.

Cons

• Not compatible with strong alkalis, ammonia, some amines, and glycol-based fluids, so chemical compatibility must be checked before use.
• Viton can be firmer than very soft elastomers, which may not suit ultra-low-pressure sealing needs.

Specifications

Material	Viton (fluorocarbon elastomer)
Color	Black
Inner diameter (ID)	5-1/2 in
Outer diameter (OD)	5-3/4 in
Cross-section width	1/8 in
Durometer	75A
Temperature range	-15 degrees F to 400 degrees F

Our Verdict

The 254 Viton O-ring pack is a practical, cost-effective choice for professionals and DIYers needing reliable, heat- and fuel-resistant seals in quantity. It is particularly good where AS568A sizing and a 75A hardness are desired; just confirm chemical compatibility for aggressive cleaners or amine-containing fluids before installation.

Frequently Asked Questions

Are these O-rings suitable for fuel systems?
Yes, Viton is compatible with many fuels and aromatic hydrocarbons, making these O-rings suitable for many fuel system seals when chemical compatibility is confirmed.

Can these be used at high temperatures?
Yes, they are rated to 400 degrees F, so they work in most high-heat sealing applications within that limit.

Will they resist ozone and weathering?
Yes, Viton offers good resistance to ozone and weathering, contributing to longer outdoor service life.