M2.4x37.6 Viton O-Ring 75A Round Black - Pack of 50

In this review the M2.4x37.6 Viton O-Ring is evaluated for technicians, hobbyists, and maintenance staff who need a chemical- and heat-resistant seal in threaded or overlapping cylindrical applications. The bottom line: this pack of 50 black Viton rings offers a dependable, mid-hardness seal that excels where resistance to fuels, oils and high temperatures matters. The reviewer found the O-ring's 75A durometer gives a balanced firmness for thread protection and sealing without excessive compression, making it a practical choice for carburetor seats, threaded barrel protectors and general industrial sealing tasks.

Key Features

• Material: Viton fluorocarbon elastomer provides strong resistance to fuels, oils and many chemicals for longer service life in harsh environments.
• Temperature range: Rated for use across a wide temperature span so it remains flexible from low temperatures to high-heat operating conditions.
• Durometer 75A: A mid-range hardness that balances sealing performance and durability without flattening under moderate compression.
• Round cross-section: Classic o-ring geometry forms an effective seal between overlapping cylindrical surfaces and threaded protectors.
• Pack quantity: Supplied as a pack of 50 which is convenient for maintenance shops or repeat replacements and reduces downtime sourcing single pieces.

Who It's For

This O-ring is best for mechanics, field technicians, and DIYers who work with non-flammable hydraulic fuels, silicone oils, and many aromatic or aliphatic hydrocarbons where chemical compatibility and heat resistance are required. It is also useful for users who need reliable thread protection and sealing for firearm barrels or small engine carburetors, as customers reported good fits on 10mm and Springfield threaded barrels and carburetor seat applications.

Those who need compatibility with highly polar chemicals, ammonia gas, strong alkalis, or glycol-based brake fluids should look elsewhere, since Viton is vulnerable to some low molecular weight organic acids, amines and super-heated steam. Also, if a softer, squeeze-friendly seal is required, a lower durometer material would be more appropriate.

Pros & Cons

Pros

• Excellent chemical and fuel resistance for many common lubricants and hydrocarbons.
• The 75A hardness provides durable sealing and good thread protection without excessive deformation.
• Wide temperature capability that suits a range of workshop and industrial conditions.
• Pack of 50 gives strong value for maintenance use and multiple replacements.

Cons

• Not compatible with certain chemicals such as ammonia, strong alkalis, some brake fluids and super-heated steam.
• The 75A hardness may be too firm for applications that require very soft sealing contact.

Specifications

Our Verdict

The M2.4x37.6 Viton O-Ring is a practical, cost-effective choice for users who need a heat- and fuel-resistant seal in threaded or cylindrical applications. Its 75A hardness and Viton construction make it particularly suited to maintenance shops and equipment exposed to oils and hydrocarbons; buy it if you want reliable sealing and value in bulk, but choose a different compound if your application involves ammonia, strong alkalis or requires a softer gasket.

Frequently Asked Questions

Is this O-ring suitable for gasoline and hydraulic fuel?
Yes, Viton is compatible with many fuels and non-flammable hydraulic fluids listed among typical safe uses.

What temperature range will it tolerate?
It is designed to work across a wide temperature range, remaining functional from low temperatures up to several hundred degrees Fahrenheit.

Will it fit small threaded barrels and carburetor seals?
Customers report good fits on 10mm threaded barrels and small carburetor seat seals, making it a common choice for those uses.