M2x50 Viton Fluoroelastomer O-Ring 50mm ID Pack of 20 - Chemical

In this review the M2x50 Viton fluoroelastomer O-ring pack is evaluated for workshop and industrial use; the bottom line is that it is a reliable, high-temperature sealing option best suited to chemical, fuel and high-heat applications. The reviewer found the pack of 20 O-rings to offer consistent dimensions and robust material performance, making it a go-to for small repairs, hydraulic fittings and specialty projects where resistance to fuels and many solvents matters most.

Key Features

• Material: Made from Viton fluoroelastomer, the O-ring delivers strong resistance to fuels, aromatic and aliphatic hydrocarbons, and many chemicals commonly used in engines and industrial systems.
• Temperature range: Rated to work from -15 degrees F (-26 degrees C) up to 400 degrees F (205 degrees C), it suits both cold-start and high-heat environments without rapid degradation.
• Hardness: With a 75A Shore durometer rating, these rings balance flexibility and resistance to penetration for reliable sealing under compressive loads.
• Standard sizing: The round cross-section and metric dimensions (50 mm ID, 54 mm OD, 2 mm width) follow Aerospace sizing conventions, aiding interchangeability with common O-ring seats and caps.
• Chemical compatibility: Compatible with non-flammable hydraulic fuels, silicone oils, trichlorethylene and benzene; useful when chemical exposure is expected.
• Value pack: Sold in a pack of 20, the set is convenient for frequent maintenance or for keeping spares on hand.

Who It's For

The M2x50 Viton O-ring is aimed at hobbyists, mechanics and maintenance technicians who need a small, dependable seal for fuel systems, hydraulic fittings, or applications exposed to high heat or aromatic hydrocarbons. Its compatibility with a range of fuels and oils makes it suitable for specialty engines, power steering caps and small plumbing repairs where a durable, heat-resistant seal is required.

Those working with strong alkalis, ammonia gas, low molecular organic acids, glycol-based brake fluids, or amines should look elsewhere or verify chemical compatibility before use, since Viton can be vulnerable to these fluids. For general-purpose, non-chemical household sealing tasks a softer elastomer might offer easier installation and better compression sealing.

Pros & Cons

Pros

• Consistent sizing and fit make installation straightforward in standard metric seats and caps.
• Excellent heat and fuel resistance from the Viton material for harsh-service applications.
• Good durability reported by users, offering solid value for routine maintenance and repairs.

Cons

• Not compatible with certain chemicals such as ammonia, strong alkalis and some brake fluids, limiting universal use.
• The 75A hardness may be firmer than desired for delicate or irregular sealing surfaces.

Specifications

Our Verdict

For users who need a small, heat- and fuel-resistant seal, the M2x50 Viton O-ring is a practical choice that balances durability and chemical resistance at a reasonable value when bought as a pack. It is especially well suited to automotive and industrial applications where exposure to fuels and high temperatures is expected; those needing broad compatibility with alkaline or amine-based fluids should verify suitability before installing.

Frequently Asked Questions

Are these O-rings suitable for gasoline and diesel exposure?
Yes, Viton is broadly compatible with many fuels including diesel and common automotive fuels, making these O-rings appropriate for fuel-exposed seals.

Will they fit standard metric fittings and caps?
These rings follow standard aerospace sizing and the specified 50 mm ID / 54 mm OD dimensions, so they fit metric seats and caps that accept that size range.

Can I use them with brake fluid or ammonia?
No, Viton is vulnerable to glycol-based brake fluids, ammonia and certain low molecular organic acids, so avoid those fluids or confirm compatibility first.