463 Viton O-Ring 75A Durometer, 17 in ID - High-Temperature Seal

Our review of the 463 Viton O-Ring finds it best suited to anyone needing a compact, high-temperature sealing solution for fuel, hydraulic, or chemical systems. The single biggest reason to buy is its material: made from brown Viton fluorocarbon elastomer with a 75A durometer, this O-ring stands up to heat, fuels and many solvents while keeping a reliable seal in demanding environments. It is a practical choice for repair and maintenance tasks where compatibility and temperature range matter more than decorative packaging or bulk quantities.

Key Features

• Material: Viton (fluorocarbon elastomer) offers high resistance to heat, fuels and many chemicals so the ring performs in harsh service conditions.
• Hardness: 75A durometer provides a firm resistance to penetration while still compressing enough to form a dependable seal on cylindrical surfaces.
• Shape: Round cross-section is designed to seal between overlapping cylindrical parts and create a reliable contact surface when compressed.
• Temperature range: Rated from -15 degrees F to 400 degrees F so it can be used across wide thermal cycles in engines, pumps or outdoor fittings.
• Size standard: Meets Aerospace Standard AS568A sizing, which helps ensure predictable fit when replacing specified O-rings.

Who It's For

This O-ring is for technicians, mechanics and DIYers who need a single, correctly sized seal for repair jobs on injectors, hoses, pumps or fittings that encounter fuels, oils and higher temperatures. It is also useful for systems exposed to ozone and weathering where standard nitrile rings may fail.

Customers who need large quantities, a different color, or extreme chemical resistance to strong bases or ammonia should look elsewhere; Viton is vulnerable to low molecular organic acids, ammonia gas and certain amines, so confirm chemical compatibility before specifying this as a long-term solution.

Pros & Cons

Pros

• Strong chemical and fuel resistance delivers consistent leak prevention in compatible fluids.
• Wide operating temperature range supports use in engines and hot systems without rapid degradation.
• AS568A sizing and the 17 in ID/17.5 in OD dimensions make it a drop-in replacement where that standard is required.
• Customers report good fit and value for money when replacing injector and hose seals.

Cons

• Some buyers note the ring can be thinner than expected and the color may not match the brown shown, so verify fit visually before final installation.

Specifications

Material	Viton (fluorocarbon elastomer)
Durometer	75A
Cross-section	Round
Inner diameter	17 in
Outer diameter	17.5 in
Width	1/4 in
Standards	Meets Aerospace Standard AS568A

Our Verdict

The 463 Viton O-Ring is a sensible pick for repairs where heat, fuel and solvent resistance are required and where AS568A sizing is expected. It delivers dependable sealing performance and good value as a single replacement part, though installers should confirm chemical compatibility and note occasional variation in thickness or color before final installation.

Frequently Asked Questions

Is this O-ring suitable for fuel systems?
Yes. Made of Viton, it is compatible with many fuels and aromatic hydrocarbons, making it suitable for non-flammable hydraulic fuels and fuel system seals when chemical compatibility is confirmed.

What temperature range will it tolerate?
The ring is rated for use from -15 degrees F up to 400 degrees F, allowing use in both cold starts and high-heat engine or pump applications.

Will it resist all chemicals?
No. Viton resists many solvents and oils but is vulnerable to low molecular organic acids, ammonia gas, alkalis and some amines, so check compatibility for aggressive chemicals.