445 Viton O-Ring 75A Durometer 8in ID 8-1/2in OD Pack of 5 - Durable

Our review of the 445 Viton O-ring pack explains who should consider these parts and why they stand out for demanding sealing jobs. These black, round O-rings are made from Viton (fluorocarbon elastomer) and the single biggest reason to buy is their broad chemical and temperature resistance, which makes them suitable for fuel, hydraulic, and high-heat applications where other elastomers fail. The pack of five and the 75A shore hardness make them a practical choice for repairs and replacements where durability and a precise fit matter.

Key Features

• Material: Viton construction gives reliable resistance to fuels, aromatic and aliphatic hydrocarbons, and many chemicals encountered in industrial and automotive use.
• Temperature range: Rated from -15 degrees F to 400 degrees F, allowing use in both cold storage and high-heat engine or exhaust environments.
• Durometer: 75A hardness resists penetration and extrusion while still providing a flexible seal for cylinders and overlapping surfaces.
• Size and fit: 8in inner diameter with an 8-1/2in outer diameter and 1/4in width matches AS568A 445 dimensions for common replacement needs.
• Pack quantity: Five O-rings per pack offers spare parts for multiple devices or repeat maintenance tasks, improving value for money.

Who It's For

The 445 Viton O-ring pack is aimed at technicians, hobbyists, and maintenance staff who need a resilient seal for fuel systems, hydraulic fittings, suppressors, or other cylindrical joins where exposure to heat, fuels, and many chemicals is expected. Its compatibility with non-flammable hydraulic fuels, silicone oils, and many hydrocarbons makes it useful in automotive, industrial, and outdoor equipment applications.

Those who should look elsewhere include users needing compatibility with glycol-based brake fluids, strong alkalis, or ammonia gas, and anyone whose application involves sustained exposure to super-heated steam or low molecular weight organic acids, since Viton is vulnerable to those media.

Pros & Cons

Pros

• Excellent chemical and fuel resistance for a wide range of service environments.
• Wide usable temperature window from -15 degrees F to 400 degrees F for versatile applications.
• 75A hardness provides a balance of durability and sealing performance in cylindrical assemblies.
• Pack of five provides spare parts and good value for common repair tasks.

Cons

• Not suitable for applications exposed to ammonia, strong alkalis, glycol-based brake fluids, or super-heated steam.
• Viton can be more expensive than general-purpose elastomers for low-demand seals.

Specifications

Material	Viton (fluorocarbon elastomer)
Color	Black
Inner Diameter	8 in
Outer Diameter	8-1/2 in
Width / Cross-section	1/4 in
Durometer	75A
Temperature Range	-15 degrees F to 400 degrees F

Our Verdict

The 445 Viton O-ring pack is a sensible buy for anyone needing a durable, heat- and fuel-resistant seal in cylindrical assemblies. It offers dependable material performance and a practical pack size for repairs, making it good value for users who require chemical compatibility and high-temperature service; avoid it only where incompatible fluids or extreme steam exposure are present.

Frequently Asked Questions

Are these O-rings suitable for fuel system use?
Yes, the Viton material is compatible with many fuels, aromatic and aliphatic hydrocarbons, and is commonly used in fuel pump and related applications.

Do they meet standard O-ring sizes?
Yes, these follow the AS568A 445 profile and the listed 8 in ID, 8-1/2 in OD, 1/4 in width dimensions for replacement use.

Can they be used in very low temperature environments?
They are rated down to -15 degrees F, which is acceptable for many cold-weather applications but may not suit extreme cryogenic service.