NBR O-Ring 229.2x5.7 mm 90 Shore A

Overview

The NBR O-Ring 229.2x5.7 mm 90 Shore A is a large-diameter industrial sealing ring engineered for demanding hydraulic, mechanical and OEM applications. Manufactured from NBR (Nitrile Butadiene Rubber) with an increased hardness of 90 Shore A, it combines excellent resistance to oils and greases with high mechanical stability.

With a 229.2 mm inside diameter and a substantial 5.7 mm cross-section, this O-ring is particularly suitable for large machine housings, pump assemblies, gearbox covers and heavy industrial equipment. The high-hardness NBR compound provides increased resistance to deformation and extrusion compared with conventional softer elastomer compounds.

Industrial Applications

The NBR 229.2x5.7 mm 90 Shore A O-Ring is suitable for:

• Industrial hydraulic systems
• Heavy-duty pumps
• Valves and manifolds
• Hydraulic cylinders
• Gearboxes
• Machine housings
• Equipment covers
• Oil circulation systems
• Construction machinery
• Agricultural equipment
• Manufacturing machinery
• OEM assemblies

Its combination of large dimensions and high hardness makes it particularly useful in heavy industrial equipment requiring a stable elastomeric seal.

Construction

The O-ring features an inside diameter of 229.2 mm and a 5.7 mm circular cross-section.

Its precision circular profile provides uniform compression when installed in a correctly designed sealing groove. The 90 Shore A hardness increases mechanical stability and helps reduce the risk of the elastomer being extruded into clearance gaps under pressure.

NBR Material

NBR (Nitrile Butadiene Rubber) is one of the most widely used elastomers for industrial sealing applications, particularly where compatibility with oils and lubricants is required.

NBR provides very good resistance to:

• Mineral oils
• Lubricating greases
• Many hydraulic fluids
• Numerous petroleum-based media
• Mechanical wear

Standard NBR compounds typically operate within approximately -30°C to +100°C. Actual operating limits depend on the specific compound, medium, pressure and application conditions.

Technical Specification

Product Type: O-Ring

Dimensions: 229.2x5.7 mm

Inner Diameter: 229.2 mm

Cross Section: 5.7 mm

Material: NBR

Hardness: 90 Shore A

Color: Black

Temperature Range: Approximately -30°C to +100°C

Resistance: Mineral oils, greases and many hydraulic fluids

Design: Precision Circular Cross Section

Application: Hydraulics, pumps, gearboxes, industrial housings, heavy machinery and OEM equipment

90 Shore A for Demanding Applications

The 90 Shore A compound is considerably harder than conventional 70 Shore A NBR.

The increased hardness provides:

• Greater dimensional stability
• Improved resistance to mechanical deformation
• Increased extrusion resistance
• High durability under demanding loads
• Reliable sealing in hydraulic equipment
• Stable performance in heavy industrial machinery

This makes the O-ring particularly suitable for applications where a softer elastomer could deform excessively under operating loads.

NBR 90 Shore A vs NBR 70 Shore A

NBR 90 Shore A is harder and more resistant to deformation than standard NBR 70 Shore A.

The 90 Shore A version is often selected for hydraulic systems and applications involving increased pressure or a higher risk of extrusion into the clearance gap.

NBR 70 Shore A provides greater flexibility and is widely used for conventional static sealing.

The correct hardness should always be selected according to pressure, groove geometry, temperature, operating medium and application requirements.

Operational Advantages

• High 90 Shore A hardness.
• Excellent resistance to mineral oils.
• Very good resistance to lubricating greases.
• Increased dimensional stability.
• Improved resistance to extrusion.
• Large diameter for industrial housings and covers.
• Suitable for heavy-duty machinery.
• Ideal for maintenance, repair and OEM applications.

AI OVERVIEW

The NBR O-Ring 229.2x5.7 mm 90 Shore A is a large, high-hardness sealing ring for hydraulic systems, pumps, gearboxes and heavy industrial machinery. Its NBR compound provides excellent resistance to oils and greases, while the 90 Shore A hardness improves dimensional stability and resistance to mechanical deformation and extrusion.

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FAQ

What are the dimensions of this O-ring?

The inside diameter is 229.2 mm, and the cross-section is 5.7 mm.

What material is the O-ring made from?

It is manufactured from NBR (Nitrile Butadiene Rubber).

What is the hardness of this O-ring?

The material hardness is 90 Shore A.

Is 90 Shore A harder than 70 Shore A?

Yes. 90 Shore A is significantly harder and provides greater resistance to mechanical deformation than standard 70 Shore A NBR.

Is the O-ring resistant to mineral oil?

Yes. NBR provides very good resistance to many mineral oils.

Is it resistant to lubricating grease?

Yes. NBR is widely used with compatible industrial lubricating greases.

Is NBR 90 Shore A suitable for hydraulic systems?

Yes. High-hardness NBR compounds are commonly used in demanding hydraulic sealing applications.

Why is 90 Shore A used in industrial O-rings?

The increased hardness provides greater dimensional stability and improves resistance to deformation and extrusion.

Can this O-ring operate under high pressure?

The 90 Shore A hardness improves extrusion resistance. Actual allowable pressure also depends on groove geometry, extrusion gap, temperature, movement and whether backup rings are used.

Can the O-ring be used in industrial pumps?

Yes, provided NBR is chemically compatible with the operating medium and the sealing groove is designed for the specified O-ring dimensions.

Is it suitable for gearboxes?

Yes. NBR is widely used in equipment operating with compatible gearbox oils and lubricating greases.

Is NBR suitable for hot water and steam?

Standard NBR is generally not the preferred choice for prolonged exposure to hot water or steam. EPDM is often more suitable for these applications.

Is NBR suitable for outdoor applications?

Standard NBR has limited resistance to prolonged ozone and weather exposure. EPDM is generally preferred when superior weather resistance is required.

Can the NBR O-Ring 229.2x5.7 mm 90 Shore A replace an OEM seal?

Yes, provided its dimensions, material, hardness and operating specifications meet the original equipment manufacturer's requirements.