M1.5x58 Viton O-Ring 75A - Pack of 50, High-Temp Seal

In this review the M1.5x58 Viton O-Ring is examined for technicians and hobbyists who need a reliable, chemical-resistant seal for threaded barrels, carburetor seats, and other cylindrical fittings. The bottom line: this pack of 50 black Viton rings stands out for its chemical compatibility and temperature range, making it a practical, cost-effective choice for maintenance and repair tasks where a durable, heat- and fuel-resistant seal is required.

Key Features

• Material: Made from Viton (fluorocarbon elastomer) to resist fuels and many chemicals, which reduces seal failures in aggressive environments.
• Hardness: 75A durometer provides a balance of flexibility and firmness so the ring maintains a tight seal without deforming under load.
• Cross-section: Round profile delivers a dependable seal between overlapping cylindrical surfaces typical of threaded barrels and fittings.
• Temperature range: Rated for a wide working range to handle applications from cold starts to high heat exposure, increasing versatility across jobs.
• Pack quantity: Supplied as a pack of 50 which offers spare parts for multiple repairs and reduces the need to reorder frequently.

Who It's For

These O-rings are aimed at mechanics, maintenance techs, and DIY users who regularly work with fuels, hydraulic fluids, silicone oils, and some chlorinated or aromatic hydrocarbons. The compact 58 mm ID size and 1.5 mm cross-section make them useful for keeping thread protectors in place and for sealing carburetor seats on specific models.

Users who need seals resistant to low molecular organic acids, ammonia gas, strong alkalis, or glycol-based brake fluids should look elsewhere or confirm chemical compatibility first, since Viton is vulnerable to those substances. Also, if a softer or very low-temperature elastomer is required, a different material may be a better match.

Pros & Cons

Pros

• Excellent chemical and fuel resistance from the Viton compound for durability in aggressive fluids.
• Solid 75A durometer balances flexibility and sealing force to maintain reliable thread protection.
• Wide temperature capability enables use in many environments from cold to high heat operations.
• Pack of 50 offers strong value and spares for repeated maintenance tasks.

Cons

• Not compatible with certain chemicals like ammonia, strong alkalis, or glycol-based brake fluids, limiting use in some specialty systems.

Specifications

Material	Viton (fluorocarbon elastomer)
Durometer	75A
Shape	Round cross-section
Inner Diameter (ID)	58 mm
Outer Diameter (OD)	61 mm
Width / Cross-section	1.5 mm
Pack Quantity	50 rings

Our Verdict

The M1.5x58 Viton O-Ring pack is a practical buy for users needing a durable, heat- and fuel-resistant seal at a good price. Its 75A hardness and Viton compound make it especially well suited for threaded barrels, carburetor seats, and other cylindrical seals where chemical exposure and temperature swings are expected.

Frequently Asked Questions

Will these O-rings withstand exposure to gasoline?
Yes, Viton is resistant to many fuels and aromatic hydrocarbons, making these rings suitable for gasoline and similar fluids.

Are they suitable for very low temperatures?
They work down to about -15 degrees F (-26 degrees C) but if you need performance much below that, consider a low-temperature specific elastomer.

Can one ring be used for thread protection on firearm barrels?
Customers report a good fit on certain threaded barrels and for keeping thread protectors in place, but confirm dimensions match your barrel before use.