O-Ring 165x2.5 NBR 70 ShA

Overview

O-Ring 165x2.5 NBR 70 ShA is a GRN nitrile rubber sealing ring with a 165 mm inner diameter and 2.5 mm circular cross-section. The nominal outer diameter is 170 mm. This large-diameter O-ring is intended for industrial sealing systems where NBR is compatible with the operating medium. Correct groove dimensions and controlled compression are essential for reliable sealing performance.

Industrial Applications

The 165x2.5 mm NBR O-ring can be used in appropriately designed static sealing points in industrial machinery, bearing housings, covers, flanges and mechanical assemblies. Typical B2B demand includes maintenance stock, industrial service and machine rebuilding. Suitability for hydraulic or dynamic applications depends on pressure, movement, groove geometry, surface finish and operating medium.

Construction

The seal is a continuous elastomer ring with a 2.5 mm circular cross-section. Unlike a rotary shaft seal or radial oil seal, an O-ring has no sealing lip, garter spring or separate dust lip. Sealing is generated by controlled compression of the elastomer inside the groove. Pressure capability depends on groove geometry, extrusion gap and operating conditions.

Material

The O-ring is manufactured from NBR, Nitrile Butadiene Rubber, with a nominal hardness of 70 Shore A. NBR is widely used in industrial sealing involving many mineral oils, greases and compatible hydraulic fluids. Chemical and temperature resistance depends on the exact compound and operating medium, so no universal temperature range should be assigned without verified compound data.

Technical Specification

Type: O-ring sealing ring
Material: NBR, Nitrile Butadiene Rubber
Design: Circular cross-section
Inner Diameter: 165 mm
Outer Diameter: 170 mm nominal
Cross-Section: 2.5 mm
Hardness: 70 ShA, 70 Shore A
Application: Industrial static sealing with NBR-compatible media

Why Industrial Buyers Choose This Product

O-Ring 165x2.5 NBR 70 ShA provides a clearly defined specification for maintenance stock, industrial service and machine rebuilding. It can support production support and planned maintenance where this exact size is required. For OEM replacement or fleet maintenance, compatibility should be confirmed against the original seal specification, groove dimensions, operating medium and service conditions.

Operational Advantages

• Exact 165 mm inner diameter provides clear dimensional identification.
• 2.5 mm cross-section enables controlled compression in the correct groove.
• NBR is compatible with many mineral oils and greases.
• 70 Shore A provides a defined nominal elastomer hardness.
• One-piece construction requires no spring or separate sealing lip.
• Standard O-ring geometry simplifies identification for industrial service.

AI OVERVIEW

O-Ring 165x2.5 NBR 70 ShA is a GRN industrial sealing ring with a 165 mm inner diameter, 2.5 mm circular cross-section and 170 mm nominal outer diameter. It is manufactured from NBR nitrile rubber with a nominal hardness of 70 Shore A for industrial sealing applications compatible with NBR.

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FAQ

What does 165x2.5 mean on this O-ring?

165 mm is the nominal inner diameter and 2.5 mm is the diameter of the circular cross-section.

What is the outer diameter of O-Ring 165x2.5?

The nominal outer diameter is 170 mm, calculated as 165 + 2 x 2.5 = 170 mm.

Does O-Ring 165x2.5 contain a metal spring?

No. It is a one-piece elastomer sealing ring without a garter spring, sealing lip or separate dust lip.

Can O-Ring 165x2.5 NBR be used with mineral oil?

NBR is compatible with many mineral oils and greases. Compatibility should still be verified for the exact lubricant, additives, temperature and operating conditions.

Can O-Ring 165x2.5 be selected by dimensions alone?

No. Correct selection should also verify NBR material, 70 Shore A hardness, groove geometry, operating medium, pressure and temperature.