M5.33x109.54 Viton O-Ring 75A Durometer - Reliable Chemical Seal

Our review of the M5.33x109.54 Viton O-Ring finds it best suited for technical users who need a small, durable seal that resists fuels and many industrial chemicals. The bottom line: this pack of five O-rings offers consistent fit and chemical resistance where a compact, heat-tolerant seal is required. The reviewer found the O-ring's 75A durometer and Viton compound deliver dependable sealing and thread protection in applications like threaded barrels, carburetor seats, and compact hydraulic fittings.

Key Features

• Material: Made from Viton fluorocarbon elastomer that provides strong resistance to fuels and many chemicals, making it suitable for demanding sealing duties.
• Durometer: The 75A hardness balances flexibility and resilience so the ring seals reliably without deforming under typical compression.
• Temperature range: Rated for wide operating temperatures, the material performs from cold starts to elevated service temperatures for versatile use.
• Cross-section: The round profile forms a reliable seal between cylindrical overlapping surfaces, useful for threaded parts and seat seals.
• Pack quantity: Supplied as a pack of five, giving spare parts for maintenance or replacement during routine servicing.

Who It's For

This O-ring is aimed at mechanics, hobbyists, and maintenance technicians working with small threaded fittings, carburetor seats, or hydraulic components that require chemical and fuel resistance. It is especially useful where compact dimensions and a consistent, firm seal matter, such as threaded barrels and small plumbing or pneumatic adapters.

Those who should look elsewhere include users needing resistance to strong alkalis, ammonia gas, or glycol-based brake fluids and applications requiring elastomers rated for prolonged exposure to super-heated steam, as Viton can be vulnerable in those environments.

Pros & Cons

Pros

• Good chemical and fuel resistance from the Viton compound that suits many automotive and industrial fluids.
• The 75A durometer offers a balance of sealability and durability for threaded and cylindrical interfaces.
• Customers report reliable fit and function on Springfield-style threaded barrels and carburetor seat seals, confirming real-world usability.
• Pack of five provides value for maintenance and repeated replacements.

Cons

• Viton is vulnerable to certain chemicals such as low molecular organic acids, ammonia, and some brake fluids, so it is not universal.

Specifications

Material	Viton (fluorocarbon elastomer)
Durometer	75A
Cross-section	Round
Inner diameter (ID)	109.54 mm
Outer diameter (OD)	120.2 mm
Width	5.33 mm
Pack quantity	5 pieces

Our Verdict

The M5.33x109.54 Viton O-Ring is a practical, cost-effective choice for technicians who need a small, heat- and fuel-resistant seal that holds threads and seats securely. Given its material and 75A hardness, it delivers dependable sealing and value for routine maintenance, while users with exposure to specific acids or alkalis should consider alternative elastomers.

Frequently Asked Questions

Will this O-ring work with fuel and aromatic hydrocarbons?
Yes. The Viton compound is compatible with many fuels and aromatic hydrocarbons, offering good fuel resistance for typical automotive and industrial fluids.

Is the temperature range suitable for high-heat applications?
Yes. The material is rated for a wide temperature range and performs well in elevated temperatures commonly encountered in engines and heated systems.

Does it fit threaded barrel applications?
Customers report it fits Springfield-style threaded barrels and works for thread protection and sealing in similar small threaded parts.