Mr O-Ring 024 EPDM O-Ring 70A Durometer Pack of 500 - Durable Seals

In this review the reviewer looks at the Mr O-Ring 024 EPDM O-Ring pack of 500 and finds it best for technicians, maintenance shops, and DIYers who need consistent, weather-resistant seals in bulk. The single biggest reason to buy is the material and size consistency: these EPDM rings deliver reliable resistance to ozone, sunlight and a wide range of fluids while matching common AS568 dimensions, making them a practical choice when replacing or stocking standard service parts.

Key Features

• Material and durometer: The EPDM compound at 70A hardness balances flexibility and resilience for dynamic and static sealing tasks.
• Temperature range: Rated from -55C to 125C, these o-rings work across cold storage and typical hot-service environments without rapid embrittlement.
• Chemical compatibility: Performs well with alcohols, dilute acids and alkalis, brake fluid, phosphate ester hydraulic fluids, and water for common maintenance uses.
• Standard sizing: Nominal AS568 024 dimensions and close actual measurements reduce fit surprises when replacing worn seals in pumps, valves, or hose fittings.
• Bulk pack: The pack of 500 is cost-effective for shops and repeat repairs, cutting downtime by keeping spares on hand.
• Shelf stability: With effectively unlimited shelf-life, these o-rings can be stored long-term without concern for premature degradation.

Who It's For

The Mr O-Ring 024 EPDM is aimed at industrial maintenance personnel, plumbing and hydraulic technicians, and home mechanics who need a dependable stock of standard replacement seals. Its compatibility with steam, water and many polar fluids makes it useful in building systems, vehicle brake fluid service (non-systemic applications), and general-purpose sealing where ozone and weather resistance matter.

Those who need resistance to strong hydrocarbons, petroleum oils, or extreme high-temperature polymer seals should look elsewhere; EPDM is not suitable for aggressive nonpolar solvents or continuous service above the listed temperature range.

Pros & Cons

Pros

• Good ozone, sunlight and weather resistance for outdoor and exposed installations.
• Wide chemical compatibility with alcohols, dilute acids and phosphate ester hydraulic fluids allows use in varied service environments.
• Bulk quantity of 500 pieces provides economical stocking and reduces repeat ordering.
• Shelf-life is effectively unlimited, simplifying inventory for shops.

Cons

• Not recommended for exposure to strong petroleum-based oils or nonpolar solvents, limiting suitability in some automotive and industrial oil applications.
• 70A hardness may be firmer than ideal for ultra-low-pressure sealing where a softer compound would seal better.

Specifications

Material	EPDM rubber
Durometer	70A
Nominal dimensions	1-1/8 in ID, 1-1/4 in OD, 1/16 in CS
Actual dimensions	1.114 in ID, 1.254 in OD, 0.070 in CS
Metric dimensions	28.30 mm ID, 31.86 mm OD, 1.78 mm CS
Temperature range	-55C (-67F) to 125C (257F)
Pack quantity	500 pieces

Our Verdict

The Mr O-Ring 024 EPDM pack of 500 is a practical, cost-effective choice for anyone needing reliable, weather-resistant seals in standard AS568 sizes. It is particularly good value for maintenance shops and installers who service water systems, steam, and polar-fluid applications, though it is not the right choice when long-term exposure to petroleum oils or extreme high temperatures is expected.

Frequently Asked Questions

Are these o-rings sized to AS568 standards?
Yes, the product is offered to match the AS568 024 nominal size with closely measured actual dimensions for predictable fit.

Can these o-rings be used in brake systems?
They perform with automotive brake fluids for many repair tasks, but always confirm compatibility with the specific system and fluid in use.

How long can these o-rings be stored?
They have an effectively unlimited shelf-life when stored in normal dry conditions out of direct sunlight.