M2.4x13.8 Viton O-Ring 75A Durometer, 13.8mm ID - Pack of 500

In this review of the M2.4x13.8 Viton O-Ring pack, the bottom line is simple: this set is aimed at technicians, hobbyists, and maintenance professionals who need large quantities of reliable chemical- and heat-resistant seals. The reviewer found the biggest reason to buy is the material choice - genuine Viton (fluorocarbon elastomer) with a 75A durometer - which provides consistent sealing performance across a wide temperature range and good resistance to fuels and many solvents, making this pack a practical inventory item rather than a one-off purchase.

Key Features

• Material: Made of Viton fluorocarbon elastomer to handle fuels, oils, and many chemicals without rapid degradation.
• Hardness: 75A durometer offers a balance of flexibility and compression resistance for reliable sealing under moderate loads.
• Cross-section: Round profile provides a classic seal between cylindrical mating surfaces for O-ring grooves and fittings.
• Temperature range: Rated to perform across a wide temperature span, useful for both cold and high-temperature applications encountered in engines and hydraulics.
• Bulk quantity: Supplied as a pack of 500, which is cost-effective for workshops, production runs, and preventive maintenance stock.

Who It's For

This pack is best for professionals and serious hobbyists who routinely replace seals on hydraulics, fuel systems, carburetor components, threaded barrel protectors, or other assemblies exposed to fuels and aromatic hydrocarbons. The large quantity suits workshops, gunsmiths protecting threads, and anyone stocking spare parts for recurring maintenance.

Those who should look elsewhere include users needing compatibility with strong alkalis, ammonia, amines, glycol-based brake fluids, or super-heated steam, where Viton is vulnerable, and anyone requiring a softer or much harder material than 75A for very low-pressure static sealing or extreme compression applications.

Pros & Cons

Pros

• Durable chemical and fuel resistance makes these O-rings useful where petroleum-based fluids are present.
• 75A durometer delivers good sealability while remaining flexible enough for many dynamic assemblies.
• Pack of 500 delivers strong value for money and reduces downtime by keeping spares on hand.
• Works well for thread protection and small sealing tasks, as customers report for barrel protectors and carburetor seats.

Cons

• Viton has known vulnerabilities to low molecular organic acids, ammonia, certain amines, alkalis, and glycol-based brake fluids, so it is not universal.
• The specified temperature range has some variance in documentation; verify compatibility for critical high-temperature service before relying on these rings.

Specifications

Material	Viton (fluorocarbon elastomer)
Durometer	75A
Inner Diameter	13.8 mm
Outer Diameter	18.6 mm
Cross-section / Width	2.4 mm (round)
Color	Black
Pack Quantity	500 pieces

Our Verdict

This M2.4x13.8 Viton O-ring pack is a practical purchase for workshops and professionals who need resilient, fuel-resistant seals in volume. Its 75A hardness and Viton chemistry make it good value for many hydraulic and fuel-system tasks, but users exposed to ammonia, strong alkalis, or glycol brake fluids should choose a different material.

Frequently Asked Questions

Are these O-rings suitable for fuel and oil exposure?
Yes. The Viton fluorocarbon formulation offers good resistance to many fuels, aromatic and aliphatic hydrocarbons, and silicone oils.

What temperature range do they handle?
They are specified to work across a wide range, with practical use from around -15 degrees F (-26 degrees C) up to high temperatures; verify for critical applications.

Can they be used with brake fluid or ammonia?
No. Viton is vulnerable to glycol-based brake fluids, ammonia, amines, and strong alkalis, so avoid those media.