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70 Durometer Buna-N O-Ring, Inch OD, 1-1/16 Inch ID, 0.10 Inch Width

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Description & Features

Crafted from high-quality 70 Durometer Buna-N, this O-Ring is designed for durability and reliability in industrial environments. With an actual inner diameter of 1.049 inches and an outer diameter of 1.255 inches, it ensures a precise fit for your applications. The width of 0.103 inches provides optimal sealing capability for a variety of hydraulic systems, effectively preventing leaks under pressure.

Renowned for its temperature resilience, this O-Ring functions efficiently within a range of -40°F to 240°F, making it suitable for diverse operational conditions. As part of Hercules Sealing Products, it meets rigorous industry standards, ensuring performance consistency. The nominal dimensions, including a 1-1/16 inch ID and a 1-1/4 inch OD, align with industry requirements, enhancing its compatibility with existing equipment.

SKU: A-121

Supplier Part Number (MPN): 568-121

Alternate Part Numbers: C1CD77, MI-08740359, MINO-00407X90359

Specifications

Brand
HERCULES® SEALING PRODUCTS
Color
Black
Cross Section Shape
Round
Dash Size
121
Durometer
70A
Inside Diameter
1-1/16 in
Material
Buna-N
Series
568 Series
Suitable For Use With
Hydraulic Cylinders
System of Measurement
Imperial

Product Questions & Answers (5)

Question by: Danny S on Oct 2, 2025, 12:11 PM
trying to match up an old -121 o-ring, is this the same dash size and what are the actual measurements?
Answer by: Customer Support on Oct 3, 2025, 6:19 PM
For a straight dash-size match, this is a -121 (catalog 568-121). Actual dimensions are 1.049 inch ID, 1.255 inch OD, and 0.103 inch width.
Question by: Dwayne A on Jul 20, 2025, 1:34 PM
What's the temperature range on this o-ring? Gotta make sure it can handle the heat where I'm using it.
Answer by: Customer Support on Jul 21, 2025, 7:02 PM
It's rated for -40°F to 240°F. Keep that in mind for your application.
Question by: Jimmy S on Mar 25, 2025, 2:31 PM
these come in a 50-pack right? trying to figure out how many bags to order for a maintenance rebuild job
Answer by: Customer Support on Mar 27, 2025, 8:58 AM
Yes, they're packaged 50 per bag. If you're doing a larger rebuild, that pack quantity makes it easy to stock up without ordering individually. The actual dimensions on these are 1.049 inch ID, 1.255 inch OD, and 0.103 inch width, so just double-check those against your groove specs before you commit to quantity.
Question by: Gene T on Nov 10, 2025, 11:57 AM
What size is this exactly? I see 1-1/4 inch OD, but then also 1.255 inch. Which is it?
Answer by: Customer Support on Nov 11, 2025, 7:26 PM
Actual outside diameter is one and a quarter inches (1.255"). The 1-1/4" is the nominal, or approximate, size.
Question by: Cody J on Feb 23, 2026, 4:18 PM
i’ve got an AS568A -121 o-ring i’m trying to replace. is this the same dash size?
Answer by: Customer Support on Feb 25, 2026, 8:13 AM
Match it up by dash size and supplier number. This one is dash size -121 and also tagged as ORING 568-121, so it lines up with an AS568A -121 replacement.

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