M5x22 Viton O-Ring 75A, 22 mm ID 32 mm OD - Durable Seal

In this review the M5x22 Viton O-Ring 75A is assessed for mechanics, hobbyists, and anyone needing a small, heat-resistant seal. The bottom line is simple: this pack of 25 black Viton O-rings is best for applications where chemical and fuel resistance, plus a compact, reliable seal, matter most. It is particularly useful for threaded barrel protection, carburetor seat seals, and other cylindrical overlap seals where a 22 mm ID and 32 mm OD fit. The review highlights fit, material performance, and practical limitations observed in regular use.

Key Features

• Material: Made from Viton fluorocarbon elastomer so it resists many fuels, oils, and chemicals better than general-purpose rubbers.
• Hardness: The 75A durometer balances flexibility and compression resistance for repeatable sealing under moderate mechanical load.
• Cross-section: Round profile provides a consistent seal between overlapping cylindrical surfaces such as threaded barrels and housings.
• Temperature range: Usable across a wide temperature span, making it suitable for cold starts and elevated operating temperatures in many systems.
• Pack quantity: Supplied as a pack of 25 so you get spares for maintenance, replacements, or multiple installations.

Who It's For

This O-ring is aimed at technicians, motorcycle and small-engine owners, and industrial maintenance personnel who need a compact seal compatible with non-flammable hydraulic fluids, silicone oil, and many hydrocarbons. It works well for protecting threads, sealing small carburetor seats, and use in vacuum or fuel-handling assemblies.

Those who should look elsewhere include users who need compatibility with strong bases, amines, ammonia gas, or glycol-based brake fluids, since Viton can be vulnerable to those media. If a softer seal or a significantly different size is required, choose a different elastomer or dimension.

Pros & Cons

Pros

• Excellent chemical and fuel resistance for many common automotive and industrial fluids.
• Good temperature tolerance that covers most routine service conditions without rapid degradation.
• Appropriate hardness and round cross-section for reliable sealing and thread protection in small assemblies.
• Sold in a 25-piece pack, offering value and ready replacements.

Cons

• Vulnerable to certain media like ammonia, alkalis, and glycol-based brake fluids, limiting use in some chemical environments.
• The specific 22 mm ID / 32 mm OD size may not suit larger or nonstandard sealing points without verifying fit.

Specifications

Material	Viton (fluorocarbon elastomer)
Durometer	75A
Cross-section	Round
Inner Diameter	22 mm
Outer Diameter	32 mm
Width / Cross-section	5 mm
Pack Quantity	25 pieces

Our Verdict

The M5x22 Viton O-Ring 75A is a practical, cost-effective choice for routine sealing tasks that involve common fuels and oils, threaded protection, and compact mechanical joints. It offers good temperature and chemical resistance for most service environments, and the 25-piece pack is convenient for repairs. Buy it if you need a reliable Viton seal in the specified size; look elsewhere when working with strong alkalis, amines, or brake fluids.

Frequently Asked Questions

Will this O-ring resist gasoline and common hydraulic fluids?
Yes, Viton is compatible with many fuels and non-flammable hydraulic fluids listed, making these O-rings suitable for such uses.

Is the 75A hardness too stiff for thread protection?
No, 75A provides a balance of flexibility and resistance so it holds thread protectors and provides sealing without excessive flattening.

Can it be used with brake fluid or ammonia?
It is vulnerable to glycol-based brake fluids and ammonia, so avoid those media or choose a different elastomer for those applications.