464 Viton O-Ring 75A Durometer 17-1/2 in ID 18 in OD - Pack of 5

In this review the 464 Viton O-ring pack is evaluated as a practical choice for users who need heat- and chemical-resistant seals. The bottom line: it is best for mechanics, hobbyists, and field technicians who require a reliable replacement O-ring for fuel systems, hydraulic fittings, or firearm and suppressor maintenance, because its Viton construction and broad temperature range deliver durability and chemical compatibility where standard elastomers fail.

Key Features

• Viton material: Provides strong resistance to fuels, aromatic and aliphatic hydrocarbons, silicone oil, and many chemicals, extending service life in harsh environments.
• Wide temperature range: Rated from -15 degrees F to 400 degrees F, making it suitable for hot engine compartments and cold-weather storage without rapid degradation.
• 75A durometer: The shore hardness balances compression resistance and flexibility to maintain a reliable seal under pressure and repeated assembly.
• Round cross-section: Designed to seal between overlapping cylindrical surfaces for common plumbing, hydraulic, and fuel system applications.
• AS568A dimensional standard: Ensures consistent sizing and interchangeability for repairs that call for standard O-ring profiles.

Who It's For

This pack is aimed at maintenance professionals, firearms and suppressor owners, and anyone replacing seals in fuel pumps, MSA bottles, or hydraulic fittings who needs a material with proven heat and chemical resistance. The pack of five makes it convenient for multiple repairs or keeping spares on hand.

Those who need resistance to strong alkalis, ammonia, certain amines, or glycol-based brake fluids should look elsewhere, since Viton is vulnerable to some low molecular weight organic acids, alkalis, and super-heated steam. For general purpose household sealing where such exposures are unlikely, a less expensive elastomer might suffice.

Pros & Cons

Pros

• Excellent chemical and fuel resistance for demanding applications.
• High temperature capability up to 400 degrees F for engine and industrial use.
• Consistent sizing to AS568A standards makes replacement straightforward.
• Good value as a pack of five for multiple repairs or backup spares.

Cons

• Not suitable for exposure to alkalis, ammonia, certain amines, glycol-based brake fluids, or super-heated steam.
• Higher material cost than generic elastomers, which may be unnecessary for low-stress household uses.

Specifications

Our Verdict

The 464 Viton O-ring pack is a solid, cost-effective choice for technicians and hobbyists who need durable seals that resist fuels, oils, and high temperatures. It is especially useful where AS568A sizing is required; however, users working with strong alkalis or steam should choose a different material. For most fuel and hydraulic repair tasks, it represents good value and reliable performance.

Frequently Asked Questions

Can this O-ring handle fuel exposure?
Yes; Viton is compatible with fuels, aromatic and aliphatic hydrocarbons, and many common oils.

What temperature range is safe for this O-ring?
The specified service range is -15 degrees F to 400 degrees F.

Will it fit standard AS568 sizes?
Yes; the product meets AS568A dimensional standards for interchangeability.