M2x105 Viton O-Ring 75A Durometer, 105 mm ID - Durable Seal

In this review the M2x105 Viton O-Ring is evaluated for workshop and field sealing tasks where chemical and heat resistance matter. The bottom line: this pack of 25 black Viton rings is best for technicians and hobbyists who need a reliable, medium-hardness seal that resists fuels and many chemicals; its primary selling point is the material performance across a wide temperature range. The reviewer found the size and hardness make it a versatile replacement for threaded barrel protectors, carburetor seat seals and many hydraulic or pneumatic static sealing points.

Key Features

• Material: Made of Viton fluorocarbon elastomer for strong resistance to fuels, oils and many solvents so seals last in aggressive environments.
• Temperature range: Rated for wide use from low temperatures up to high heat so applications that see thermal cycling remain sealed.
• Durometer: 75A hardness gives a balance of flexibility and compression set resistance suitable for dynamic and static seals.
• Round cross-section: Classic O-ring shape provides a consistent sealing surface between overlapping cylindrical parts for predictable performance.
• Pack quantity: Supplied as a pack of 25 which reduces downtime and keeps spares on hand for routine maintenance.

Who It's For

The M2x105 Viton O-Ring is aimed at mechanics, gunsmiths, small engine repairers and industrial maintenance staff who need a chemical- and heat-resistant O-ring in a common 105 mm ID size. It is also a good fit for hobbyists who maintain motorcycles or carburetors and need reliable thread protection or seat seals.

Those who should look elsewhere include users requiring resistance to strong alkalies, ammonia gas, or certain glycol-based brake fluids, since Viton has known vulnerabilities to those chemicals. Also, if a much softer or much harder durometer is required for a specific dynamic seal, select a different hardness.

Pros & Cons

Pros

• Excellent chemical and fuel resistance from the Viton compound provides durable performance in many service fluids.
• Wide usable temperature range keeps seals effective from cold starts to high-heat conditions.
• 75A durometer balances flexibility and sealing force so it fits a variety of cylindrical joints without excessive compression.
• Pack of 25 offers strong value and convenient spares for maintenance jobs.

Cons

• Not compatible with some low molecular organic acids, certain amines and glycol-based brake fluids, so it is not universal for all chemicals.
• The 75A hardness may be too stiff for seals that require a very soft material to conform to irregular surfaces.

Specifications

Material	Viton (fluorocarbon elastomer)
Durometer (hardness)	75A
Cross-section	Round
Inner diameter (ID)	105 mm
Outer diameter (OD)	109 mm
Width / cross-section height	2 mm
Pack quantity	25 pieces

Our Verdict

The M2x105 Viton O-Ring delivers dependable sealing where heat and fuel resistance are required, making it a sensible buy for maintenance professionals and DIYers who need a durable, correctly sized replacement. The pack size and balanced 75A hardness give good value, provided the user avoids chemical environments known to attack Viton.

Frequently Asked Questions

Is this O-ring suitable for fuel systems?
Yes, Viton is resistant to many fuels and non-flammable hydraulic fluids, making it suitable for many fuel system sealing points.

What temperature range will it handle?
It is rated for a wide range from about -15 degrees F (-26 degrees C) up to high temperatures suitable for many applications.

Will it fit threaded barrel protectors?
Customers report it fits common 10 mm auto threaded barrels and helps keep thread protectors in place, but check dimensions before relying on a precise fit.