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90 Durometer Buna-N O-Ring, Inch OD, 1/2 Inch ID, 0.07 Inch Width

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Description & Features

Rated at 90 durometer, this Buna-N o-ring offers a firmer compression resistance suited to higher-pressure sealing applications in hydraulic and industrial equipment. The material provides reliable performance across a temperature range of -40°F to 240°F, making it compatible with a wide range of hydraulic fluids and operating environments.

The 90 Durometer Buna-N O-Ring, 5/8 Inch OD, 1/2 Inch ID, 0.07 Inch Width carries a dash size of -014, with actual dimensions of 0.489 in. ID, 0.629 in. OD, and 0.070 in. width. It is manufactured by Hercules Sealing Products and cataloged under number C1CD18.

SKU: A-014-90D

Supplier Part Number (MPN): 568-014-90D

Alternate Part Numbers: C1CD18, D05-ORING, MI-08740308, MINO-00407X90308

Specifications

Brand
HERCULES® SEALING PRODUCTS
Color
Black
Cross Section Shape
Round
Dash Size
14
Durometer
90
Inside Diameter
1/2 in
Material
Buna-N
Series
568 Series
Suitable For Use With
Hydraulic Cylinders
System of Measurement
Imperial

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Product Questions & Answers (1)

Question by: Joyce G on Jan 6, 2026, 3:34 PM
these are 90 duro, not the standard 70 -- does that harder compound actually hold up better at higher pressures or is it just a tradeoff for less flexibility?
Answer by: Customer Support on Jan 7, 2026, 9:54 PM
Harder durometer ratings do give you better resistance to compression and extrusion under pressure, which is why 90 durometer gets specified in hydraulic applications where a softer ring might deform or blow past the sealing surface. The tradeoff is that it requires a well-machined groove and surface finish to seat properly, since the ring won't conform as readily to minor surface irregularities. For higher-pressure hydraulic work, that firmness is usually the right call.

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