M2x52 Viton O-Ring 75A Durometer, 52 mm ID - Durable Seal

In this review the M2x52 Viton O-Ring is evaluated for workshop and repair use where chemical and temperature resistance matter. The bottom line: this pack of 50 metric Viton O-rings is best for technicians and hobbyists who need a reliable seal that tolerates fuels and many solvents, and whose projects require a predictable hardness. The reviewer found the O-ring's 75A durometer and Viton compound give a consistent, snug fit for cylindrical seals and threaded barrel protection without being so stiff it becomes difficult to install.

Key Features

• Viton compound: Provides resistance to fuels, aromatic and aliphatic hydrocarbons, and many common chemicals used in mechanical systems, reducing premature failure.
• 75A durometer: Balances elasticity and firmness so the ring seals reliably under compression while remaining easy to fit onto shafts or threads.
• Metric sizing: The 52 mm inside diameter and 56 mm outside diameter make it suitable for standard metric cylindrical interfaces that need a 2 mm cross-section O-ring.
• Wide temperature range: Rated for use across a broad span of operating temperatures, so it works in both cold-start and high-heat environments.
• Pack quantity: Supplied as a pack of 50, which lowers the per-piece cost for frequent maintenance or multiple installations.

Who It's For

This O-ring is ideal for maintenance technicians, small engine mechanics, and DIYers who work with non-flammable hydraulic fluids, silicone oils, and common hydrocarbons. Its compatibility with fuel and many solvents means it fits applications like threaded barrel protection, carburetor seat sealing, and general-purpose sealing where chemical exposure is expected.

Those who should look elsewhere include users who need compatibility with strong alkalis, ammonia gas, glycol-based brake fluids, or super-heated steam, since Viton is vulnerable to those media. Also, projects requiring an extremely soft or extremely hard elastomer would be better served by a different durometer than the 75A offered here.

Pros & Cons

Pros

• Good chemical and fuel resistance for many industrial and automotive fluids.
• Consistent 75A hardness gives predictable sealing and easy installation on threads and shafts.
• Pack of 50 provides value for repair shops and repeat maintenance tasks.
• Works effectively at both low and high operating temperatures within its rated range.

Cons

• Not suitable for exposure to ammonia, strong alkalis, or glycol-based brake fluids, which limits use in some specialty environments.
• Viton is generally more costly than common elastomers, so it may be overkill for low-stress or disposable applications.

Specifications

Material	Viton (fluorocarbon elastomer)
Durometer (hardness)	75A
Cross-section	Round, 2 mm width
Inside diameter (ID)	52 mm
Outside diameter (OD)	56 mm
Temperature range	-15 degrees F (-26 degrees C) to 400 degrees F (205 degrees C)
Pack quantity	50 pieces

Our Verdict

The M2x52 Viton O-Ring is a practical choice for anyone needing a durable, chemically resistant seal in metric sizes. It delivers reliable performance and good value when used with compatible fuels and solvents, making it recommended for repair shops and informed DIYers who want consistent seal quality across multiple installations.

Frequently Asked Questions

Is this O-ring compatible with gasoline and hydraulic oil?
Yes, Viton is resistant to many fuels and non-flammable hydraulic fluids listed as compatible in the product description.

Will it work at very low temperatures?
It is usable down to about -15 degrees F (-26 degrees C), so it is suitable for most cold-weather service but not for extreme cryogenic conditions.

Can it be used with brake fluid?
No, Viton is vulnerable to glycol-based brake fluids and should not be used where those fluids are present.