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

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Description & Features

Manufactured by Hercules Sealing Products, this 70 Durometer Buna-N O-Ring carries a dash size of -029 and is sized with a 1.489 inch actual ID, 1.629 inch actual OD, and 0.07 inch width. The 70 durometer hardness rating provides a firm yet flexible seal suitable for a broad range of hydraulic and industrial fluid applications.

Buna-N (nitrile) construction gives this o-ring reliable resistance to petroleum-based oils, fuels, and hydraulic fluids. The rated temperature range of -40°F to 240°F supports use across demanding service conditions. The 70 Durometer Buna-N O-Ring, 1-5/8 Inch OD, 1-1/2 Inch ID, 0.07 Inch Width is packaged in quantities of 20, making it practical for maintenance stock and seal kit assembly.

SKU: A-029

Supplier Part Number (MPN): 568-029

Alternate Part Numbers: C1CD35, H90029, MI-08740323, MINO-00407X90323

Specifications

Brand
HERCULES® SEALING PRODUCTS
Color
Black
Cross Section Shape
Round
Dash Size
29
Durometer
70A
Inside Diameter
1-1/2 in
Material
Buna-N
Series
568 Series
Suitable For Use With
Hydraulic Cylinders
System of Measurement
Imperial

Product Questions & Answers (6)

Question by: Terry G on Aug 6, 2025, 7:56 PM
trying to replace an old -029 o-ring. is this the right dash size and what are the real measurements?
Answer by: Customer Support on Aug 8, 2025, 10:30 AM
For dash size -029, the actual measurements on this one are 1.489 inch ID, 1.629 inch OD, and 0.07 inch width. It is also listed with the nominal sizes of 1-1/2 inch ID, 1-5/8 inch OD, and 1/16 inch width.
Question by: Larry H on Apr 13, 2025, 10:21 AM
what temp range is this o-ring rated for, got an application runnin pretty hot
Answer by: Customer Support on Apr 15, 2025, 6:29 AM
Buna-N at 70 durometer handles a range from -40°F up to 240°F. For most standard hydraulic and fluid system setups running elevated temps, that upper limit covers a solid majority of real-world conditions without issue.
Question by: Dwight B on Feb 11, 2026, 3:58 PM
What's the temp range on this O-ring? I need something that can handle some heat.
Answer by: Customer Support on Feb 12, 2026, 6:48 PM
This Buna-N O-ring is rated for temperatures between -40°F and 240°F.
Question by: Freddie A on Apr 4, 2025, 2:07 PM
i got a groove cut for a -029 o-ring. are the actual measurements on this one close to what i need?
Answer by: Customer Support on Apr 5, 2025, 8:12 PM
For dash size -029, the actual dimensions on this ring are 1.489 inch ID, 1.629 inch OD, and 0.07 inch width. The nominal callout is 1-1/2 inch ID, 1-5/8 inch OD, with a nominal 1/16 inch width, so it lines up with a -029 size while showing the measured actuals.
Question by: Roy L on May 2, 2025, 4:07 PM
these come in a pack of 20, right? just wanna make sure before I order cause I need enough to do a full maintenance run on several cylinders
Answer by: Customer Support on May 4, 2025, 6:41 AM
each order ships with 20 rings. For a maintenance run across multiple cylinders, that count tends to work out well depending on how many sealing points you're dealing with per unit.
Question by: Rick T on Apr 18, 2025, 7:39 AM
What temp range can these o-rings handle?
Answer by: Customer Support on Apr 20, 2025, 6:26 AM
These Buna-N o-rings are rated for use between -40°F and 240°F.

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