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70 Durometer Buna-N O-Ring, Inch OD, 1-1/16 Inch ID, 0.21 Inch Width

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Description & Features

Manufactured by Hercules Sealing Products, this high-quality O-ring is designed for demanding industrial applications. Constructed from 70 Durometer Buna-N, it offers excellent resistance to oils and fuels, making it ideal for hydraulic systems. The O-ring features an actual inner diameter of 1.037 inches and an outer diameter of 1.457 inches, while its width is a precise 0.21 inches. This ensures a reliable seal in various equipment, preventing leaks and maintaining system efficiency even in extreme temperatures ranging from -40°F to 240°F.

Perfect for ensuring optimal performance in hydraulic and pneumatic systems, this O-ring comes in a package of 50, which is convenient for maintenance teams. Known for its durability, the 70 Durometer Buna-N O-Ring, Inch OD, 1-1/16 Inch ID, 0.21 Inch Width is a reliable component for industries requiring robust sealing solutions. The Dash Size -319 further aids in identifying the compatible applications and ensuring the correct fit.

SKU: A-319

Supplier Part Number (MPN): 568-319

Alternate Part Numbers: C1CF60

Specifications

Brand
HERCULES® SEALING PRODUCTS
Color
Black
Cross Section Shape
Round
Dash Size
319
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 (3)

Question by: Tommy W on Nov 3, 2025, 1:28 PM
What size is this exactly? I see the nominal size, but what's the actual width when you measure it?
Answer by: Customer Support on Nov 5, 2025, 6:05 AM
The actual width of this O-ring is 0.21 inches.
Question by: Randy S on Nov 15, 2025, 8:17 AM
These come in a pack of 50, that right? Got a few machines to maintain and tryin to figure out if one order covers me or if I need multiples.
Answer by: Customer Support on Nov 16, 2025, 5:32 PM
50 pieces per package. For routine maintenance across several machines, that quantity tends to go fast, so ordering ahead is smart. Each ring measures 1.037 inches inner diameter and 1.457 inches outer diameter with a 0.21 inch width, so just make sure those dimensions line up with what your equipment calls for before you commit to a bulk order.
Question by: Brenda G on Jun 12, 2025, 8:01 AM
got a groove cut for a -319 o-ring. is this the right one or am i off a size?
Answer by: Customer Support on Jun 13, 2025, 12:39 PM
Match it up by dash size and dimensions. This one is a Dash Size -319 Buna-N O-ring with an actual ID of 1.037 inches, actual OD of 1.457 inches, and a 0.21 inch cross-section width, which lines up with the nominal 1-1/16 inch ID and 1-7/16 inch OD.

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