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70 Durometer Buna-N O-Ring, Inch OD, 1/2 Inch ID, 0.10 Inch Width

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Description & Features

Manufactured by Hercules Sealing Products, this 70 Durometer Buna-N O-Ring offers a reliable static and dynamic sealing solution for hydraulic and fluid power applications. With an actual ID of 0.487 in, an OD of 0.693 in, and a cross-section width of 0.103 in, it conforms to the -112 dash size standard. The 70 durometer Buna-N (NBR) compound provides good resistance to petroleum-based oils and hydraulic fluids, with a serviceable temperature range of -40°F to 240°F.

The 70 Durometer Buna-N O-Ring, 11/16 Inch OD, 1/2 Inch ID, 0.10 Inch Width is a widely used seal size suited for fittings, cylinders, valves, and fluid connectors in industrial and mobile hydraulic equipment. Available in a package quantity of 50, this ring is well-suited for maintenance stock and repair applications.

SKU: A-112

Supplier Part Number (MPN): 568-112

Alternate Part Numbers: C1CD67, MI-08740349, MINO-00407X90349

Specifications

Color
Black
Cross Section Shape
Round
Dash Size
112
Durometer
70A
Inside Diameter
1/2 in
Material
Buna-N
Series
568 Series
Suitable For Use With
Hydraulic Cylinders
System of Measurement
Imperial

Product Questions & Answers (6)

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Question by: Dale P on Jan 11, 2026, 1:19 PM
got a groove cut for a -112 o-ring. is this the right dash size and what are the actual measurements?
Answer by: Customer Support on Jan 12, 2026, 4:22 PM
It matches dash size -112, with a nominal 1/2 inch ID, 11/16 inch OD, and 3/32 inch cross section. The actual measured dimensions are about 0.487 inch ID, 0.693 inch OD, and 0.103 inch width.
Question by: Tommy C on Oct 7, 2025, 12:52 PM
runs from -40 up to 240 degrees fahrenheit on this o-ring, but what's it actually made of and will that hold up in a hydraulic fluid environment?
Answer by: Customer Support on Oct 8, 2025, 2:21 PM
Buna-N rubber at 70 durometer is about as common as it gets for hydraulic sealing work. That material handles petroleum-based hydraulic oils well and the 70 durometer rating puts it right in the middle range for hardness, firm enough to resist extrusion under pressure but still pliable enough to seat properly. The temperature window of -40°F to 240°F covers most standard hydraulic system operating conditions without issue.
Question by: Shawn M on Mar 11, 2026, 8:50 AM
What size is this o-ring actually? I see the nominal, but what's the real deal?
Answer by: Customer Support on Mar 12, 2026, 11:33 AM
Actual dimensions are an OD of 0.693 inches, an ID of 0.487 inches, and a width of 0.103 inches.
Question by: Bobby R on Mar 25, 2025, 8:13 PM
i’ve got a dash -112 o-ring i’m swapping out, is this the right size or am i gonna be fighting it?
Answer by: Customer Support on Mar 27, 2025, 11:27 AM
For a -112 size, the nominal dimensions are 1/2 inch ID, 11/16 inch OD, and 3/32 inch width. The actual measured dimensions listed are 0.487 inch ID, 0.693 inch OD, and 0.103 inch width, so it should line up with a standard -112 replacement.
Question by: Dean B on Oct 25, 2025, 4:18 PM
what temp range is this o-ring good for? got some equipment that sees pretty cold winters and hot summer conditions both
Answer by: Customer Support on Oct 27, 2025, 6:08 AM
Buna-N at 70 durometer holds up from -40°F all the way to 240°F, so seasonal temperature swings on outdoor equipment generally fall well within that range. Cold starts and summer heat cycles both stay inside those limits without pushing the material toward cracking or excessive softening.
Question by: Dwight E on Oct 19, 2025, 10:26 AM
What's the temperature range on these o-rings?
Answer by: Customer Support on Oct 20, 2025, 4:45 PM
These Buna-N o-rings are rated for use between -40°F and 240°F.

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