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70 Durometer Buna-N O-Ring, Inch OD, 1-1/8 Inch ID, 0.10 Inch Width

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Description & Features

This 70 Durometer Buna-N O-Ring from Hercules Sealing Products provides reliable sealing in a variety of hydraulic applications. Constructed from durable 70 Durometer Buna-N, it offers excellent resistance to oil, water, and other fluids, making it suitable for demanding environments.

With a nominal ID of 1-1/8 inches, a nominal OD of 1-5/16 inches, and a width of 3/32 inches, this O-ring is designed for a precise fit. It maintains its sealing properties within a temperature range of -40°F to 240°F.

SKU: A-122

Supplier Part Number (MPN): 568-122

Alternate Part Numbers: 2-122, C1CD78, MI-08740360, MINO-00407X90360

Specifications

Brand
HERCULES® SEALING PRODUCTS
Color
Black
Cross Section Shape
Round
Dash Size
122
Durometer
70A
Inside Diameter
1-1/8 in
Material
Buna-N
Series
568 Series
Suitable For Use With
Hydraulic Cylinders
System of Measurement
Imperial

Product Questions & Answers (2)

Question by: Cheryl B on Jun 2, 2025, 11:25 AM
What fluids is this o-ring actually rated to hold up against? Got some hydraulic equipment that sees a mix of oil and water pretty regular.
Answer by: Customer Support on Jun 4, 2025, 6:30 AM
Buna-N is one of the better elastomers for exactly that kind of environment. It handles petroleum-based oils, water, and a range of common hydraulic fluids without breaking down quickly. The 70 durometer hardness gives it enough firmness to maintain a good seal under pressure without being so stiff it won't seat right. Just keep in mind the temperature window runs from -40°F up to 240°F, so as long as your system stays inside that range, you should be in good shape.
Question by: Lance K on Nov 11, 2025, 2:06 PM
What's the temperature range on this O-ring? Gotta make sure it can handle the heat in my application.
Answer by: Customer Support on Nov 13, 2025, 12:05 PM
It's rated to handle temperatures from -40°F up to 240°F.

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