027 Viton O-Ring 90A, 1-5/16 in ID - Pack of 100 Mr

In this review the reviewer looks at the 027 Viton O-Ring, a hightemperature, chemicalresistant sealing part offered in a pack of 100. The bottom line: this kit is aimed at technicians and hobbyists who need a reliable, repeatable o-ring in a common AS568 size, and the single biggest reason to buy is its material performance - the 90A Viton compound withstands a wide range of fuels, oils and high temperatures that many general purpose elastomers cannot. The review examines fit, material properties and practical uses for this specific 1-5/16 in ID item.

Key Features

• Material: 90A Viton (FKM) offers excellent resistance to high temperature, ozone and many organic solvents, ensuring long service life in demanding environments.
• Temperature range: Rated from -26C (-15F) to 232C (450F), which lets these o-rings handle very hot engine or process applications without rapid degradation.
• Size accuracy: Nominal and actual dimensions are provided so installers can match seals precisely to housings and grooves for predictable compression and sealing.
• Chemical compatibility: Performs well with petroleum products, fuels, biodiesel blends, silicone oils and many acids, making it versatile for automotive and industrial seals.
• Pack quantity: Supplied as a pack of 100, convenient for maintenance shops or bulk replacement needs and reduces reordering frequency.

Who It's For

This product is best for maintenance technicians, mechanics and industrial users who require a dependable, heatresistant o-ring in the AS568 027 size for valves, fittings or static sealing faces. The pack size and consistent 90A hardness suit routine servicing tasks where many replacements are needed.

Those who should look elsewhere include users needing a softer or much harder durometer than 90A, or those who require nonFKM materials for extreme lowtemperature flexibility below the stated range. Also, if a single spare is needed rather than a bulk pack, a smaller quantity option may be preferable.

Pros & Cons

Pros

• Viton compound gives strong resistance to high temperature and a wide range of chemicals.
• Pack of 100 provides good value for repeat maintenance and reduces downtime for shops.
• Actual and metric dimensions are listed, helping ensure correct fit in AS568 grooves.

Cons

• 90A durometer is firm and may not seal as well in applications that require a softer crosssection for low pressure or irregular mating surfaces.

Specifications

Our Verdict

The Mr O-Ring 027 Viton 90A pack is a practical, costeffective choice for professionals who need bulk, hightemperature resistant seals in a standard AS568 size. Its chemical compatibility and clearly listed actual dimensions make it good value for recurring maintenance and industrial sealing tasks, though users needing a softer seal compound should consider alternatives.

Frequently Asked Questions

Can these o-rings handle fuel and biodiesel?
Yes, the Viton formulation is stated to perform well with petroleum, diesel and biodiesel blends, as well as fuels blended with methanol or ethanol.

Are the dimensions precise for AS568 sizing?
Yes, both nominal and actual dimensions are listed and the product is intended to meet AS568 size standards for consistent fit.

Is this suitable for very low temperature applications?
The lower limit is -26C (-15F); applications requiring greater low temperature flexibility should consider a different elastomer.