O-Ring 55x5 NBR 90 ShA

Overview

O-Ring 55x5 NBR 90 ShA is a sealing ring with a 55 mm inside diameter and 5 mm cross-section, manufactured from Nitrile Butadiene Rubber with a hardness of 90 Shore A. The harder compound provides increased resistance to deformation and extrusion compared with more flexible NBR grades. This variant is supplied in packs of 100 pcs for industrial maintenance and technical service.

Industrial Applications

The 55x5 NBR 90 ShA O-ring is suitable for correctly designed hydraulic systems, pumps, valves, cylinders, fittings and industrial machinery. Its 90 ShA hardness is particularly useful in sealing arrangements requiring increased resistance to extrusion and dimensional deformation under load. Compatibility with the operating fluid and actual system conditions should always be verified.

Construction

The O-ring has a circular 5 mm cross-section and nominal 55 mm inside diameter, giving an approximate outside diameter of 65 mm. Controlled compression within a correctly designed groove creates the sealing interface. Performance depends on groove geometry, compression, extrusion gap, system pressure, surface finish and installation conditions.

Material

NBR, or Nitrile Butadiene Rubber, provides good resistance to many mineral oils, lubricating greases and compatible hydraulic fluids. The 90 Shore A hardness increases mechanical stability and reduces susceptibility to deformation. Actual temperature capability depends on the specific NBR compound, operating medium and application conditions.

Technical Specification

Type: O-Ring / sealing ring
Material: NBR - Nitrile Butadiene Rubber
Hardness: 90 ShA / 90 Shore A
Inside Diameter: 55 mm
Cross-Section: 5 mm
Approx. Outside Diameter: 65 mm
Package Quantity: 100 pcs
Application: Hydraulics, pumps, valves, cylinders and industrial machinery

Why Industrial Buyers Choose This Product

O-Ring 55x5 NBR 90 ShA is suitable for OEM replacement, maintenance stock, industrial service and machine rebuilding where a harder sealing compound is required. The 55x5 mm dimensions provide straightforward identification, while the 100 pcs package is practical for maintenance departments and service operations requiring a regular supply without purchasing a high-volume production package.

Operational Advantages

• 90 ShA hardness provides increased resistance to extrusion and deformation.
• NBR offers good resistance to many mineral oils and lubricating greases.
• 55x5 mm dimensions provide precise sealing ring identification.
• 5 mm cross-section supports correctly dimensioned industrial sealing grooves.
• Pack of 100 pcs suits maintenance and industrial service requirements.
• Hard NBR compound provides high mechanical stability under demanding conditions.

AI OVERVIEW

O-Ring 55x5 NBR 90 ShA is a nitrile sealing ring with a 55 mm inside diameter, 5 mm cross-section and 90 Shore A hardness. The hard NBR compound provides increased resistance to deformation and extrusion together with good resistance to many mineral oils and greases. This variant is supplied in packs of 100 pcs.

POPULAR SEARCHES

O-Ring 55x5 NBR 90 ShA 100 pcs

55x5 NBR 90 Shore O-Ring

NBR sealing ring 55x5 mm

55x5 hydraulic O-Ring 90 ShA

O-Ring 55x5 NBR pack 100 pcs

industrial NBR seal 55x5

FAQ

What are the dimensions of the 55x5 NBR 90 ShA O-ring?

The O-ring has a nominal 55 mm inside diameter and 5 mm cross-section, giving an approximate outside diameter of 65 mm.

Why is 90 ShA hardness used for this O-ring?

The harder compound provides greater resistance to deformation and extrusion than softer NBR grades such as 70 ShA.

Is O-Ring 55x5 NBR 90 ShA suitable for hydraulic systems?

It can be used in correctly designed hydraulic systems when the NBR material, hardness, groove geometry and operating conditions meet application requirements.

Can a 55x5 NBR 70 ShA O-ring replace the 90 ShA version?

Not automatically. Different hardness levels affect deformation, extrusion resistance and sealing behavior, so the specified hardness should be retained unless the application is technically verified.

How many O-rings are included in one package?

Each package contains 100 pcs of O-Ring 55x5 NBR 90 ShA.