M3x13.5 Viton O-Ring 75A Durometer, 13.5 mm ID - Pack of 100

In this review the M3x13.5 Viton O-Ring is presented as a workhorse sealing part for technicians and hobbyists who need reliable chemical and heat resistance in small metric sizes. The bottom line: this pack of 100 black Viton rings is worth considering when an engineer or mechanic needs consistent sealing performance across a wide temperature range, and the review focuses on fit, material properties and practical uses rather than marketing claims. It is especially useful where resistance to fuels, oils and many industrial solvents is required.

Key Features

• Material: Made of Viton fluorocarbon elastomer for proven resistance to heat, fuels and many chemicals, reducing frequent replacement in compatible environments.
• Hardness: 75A durometer provides a balance of flexibility and shape retention, helping maintain a durable seal under compression.
• Cross-section: Round profile forms a tight seal between overlapping cylindrical surfaces, which is ideal for threaded barrels, shafts and fittings.
• Temperature range: Rated for wide temperature use, allowing operation from low temperatures up to high-heat applications when used within material compatibility limits.
• Quantity: Supplied as a pack of 100, which is convenient for maintenance shops or projects that require many identical seals and reduces downtime for replacements.

Who It's For

This O-ring is aimed at maintenance technicians, small engine mechanics, and DIYers who need a compact, chemically resistant seal in metric sizes, such as replacing seat seals in carburetors or keeping thread protectors in place on automotive parts. The small ID and common size make it a practical spare for firearms threading adapters and certain motorcycle carburetor applications mentioned by users.

Those who should look elsewhere include users needing compatibility with strong bases, ammonia, or glycol-based brake fluids, where Viton is vulnerable, and anyone requiring extremely soft or extremely hard durometers outside the 75A range. For specialty polymer needs like EPDM or silicone for steam service, select the appropriate material instead.

Pros & Cons

Pros

• Good chemical and fuel resistance for many industrial solvents, making it versatile for maintenance tasks.
• Comfortable 75A hardness that balances sealing performance and ease of installation.
• Pack of 100 provides strong value for workshops and repeated-use applications.
• Customers reported reliable fit and seal quality on common threaded barrel and carburetor uses.

Cons

• Not compatible with certain media like strong alkalis, ammonia gas or glycol-based brake fluids, so material limits must be checked before use.
• Temperature guidance varies in sources; confirm the required high-temperature limit for your application before exposure to super-heated steam.

Specifications

Our Verdict

The M3x13.5 Viton O-Ring is a practical, cost-effective choice for general maintenance where chemical and heat resistance are required and the 13.5 mm ID size fits. It delivers reliable sealing performance and good value in bulk, making it a sensible pick for workshops and hobbyists who work with fuels, oils and many industrial solvents while observing Viton's material limitations.

Frequently Asked Questions

Are these O-rings suitable for fuel and oil applications?
Yes; Viton is compatible with many fuels, oils and aromatic and aliphatic hydrocarbons, making these rings suitable for many fuel and oil sealing tasks.

What temperature range can these O-rings handle?
They are designed for wide temperature use; verify specific application limits but they are intended to handle low temperatures and elevated heat within Viton compatibility ranges.

Will these protect threaded barrel caps and similar fittings?
Customers report they work well to keep thread protectors and caps in place and provide a reliable seal on common threaded barrel sizes and some carburetor seat applications.