Mr O-Ring 021 EPDM O-Ring 70A Durometer, 15/16 in ID - Pack of 500

In this review the Mr O-Ring 021 EPDM O-Ring is evaluated for technicians and maintenance buyers who need a large quantity of reliable sealing parts. The bottom line: this pack of 500 EPDM o-rings offers consistent dimensions and broad chemical and weather resistance, making it a sensible bulk choice for preventative maintenance and multiple repair jobs. The reviewer found the 70A durometer EPDM to balance flexibility with durability across a wide temperature range, and the pack size suits workshops, fleets, or facilities that replace seals regularly.

Key Features

• Material: EPDM compound provides excellent resistance to ozone, sunlight and weather, which reduces seal failure outdoors or in exposed installations.
• Durometer: 70A hardness gives a firm but flexible seal that performs well in static and many dynamic sealing applications.
• Dimensions: Nominal and actual sizes (15/16 in ID vs 0.926 in actual) mean customers can expect close tolerances for fittings specified to AS568 sizes.
• Chemical compatibility: Compatible with alcohols, dilute acids and alkalis, brake fluid and many polar solvents, making them versatile across common fluids.
• Temperature range: Rated from -55C to 125C for general service and can withstand steam exposure at higher short-term temperatures.
• Pack size: Supplied as 500 pieces, suitable for workshops and facilities that require frequent replacement without repeated ordering.

Who It's For

The 021 EPDM o-ring pack is best for maintenance crews, plumbing and hydraulic technicians, and operations managers who need a dependable, economical supply of standard AS568-sized seals. The large pack is particularly useful for preventative maintenance programs, service vans, and production lines where having many spare seals on hand reduces downtime.

Those needing specialty elastomers for fuels, petrochemical immersion, or very high temperature continuous service should look elsewhere; EPDM is not recommended for many hydrocarbons and some nonpolar solvents. For precision applications that demand custom sizes or materials other than EPDM, a single-size bulk pack may not be ideal.

Pros & Cons

Pros

• Consistent actual dimensions close to nominal size help ensure reliable fittings in standard grooves.
• Good resistance to ozone, weathering and a range of common fluids, which increases service life outdoors.
• 70A durometer offers a practical balance of flexibility and seal strength for many general applications.
• Large pack of 500 reduces per-piece cost and lowers ordering frequency for busy shops.

Cons

• EPDM is not compatible with many hydrocarbons and nonpolar solvents, limiting use in fuel-system applications.
• Bulk packs may be more than needed for occasional DIY users who prefer smaller quantities.

Specifications

Brand	Mr O-Ring
Material	EPDM
Durometer	70A
Nominal Dimensions	15/16 in ID, 1-1/16 in OD, 1/16 in CS
Actual Dimensions	0.926 in ID, 1.066 in OD, 0.070 in CS
Metric Dimensions	23.52 mm ID, 27.08 mm OD, 1.78 mm CS
Temperature Range	-55C to 125C (-67F to 257F)

Our Verdict

The Mr O-Ring 021 EPDM pack of 500 is a practical, cost-effective choice for facilities and technicians who need dependable AS568-sized seals that resist weathering and a wide range of common fluids. It represents good value where EPDM compatibility is acceptable, but buyers dealing with fuels or specialized chemicals should select a different elastomer.

Frequently Asked Questions

Are these o-rings compatible with fuel?
EPDM is generally not recommended for hydrocarbons and many fuels; choose a different material for fuel system applications.

Do these meet AS568 sizes?
Yes, the product is intended to meet AS568 size standards and lists both nominal and actual dimensions for verification.

Is the pack suitable for outdoor use?
Yes, EPDM offers excellent resistance to ozone, sunlight and weather, making these suitable for outdoor and exposed installations.