NBR O-Ring 219.2x5.7 mm 90 Shore A

Overview

The NBR O-Ring 219.2x5.7 mm 90 Shore A is a large-diameter, high-hardness industrial sealing element manufactured from NBR (Nitrile Butadiene Rubber). It is designed for demanding hydraulic, mechanical and OEM applications requiring excellent resistance to mineral oils, greases and many conventional hydraulic fluids.

The combination of a 219.2 mm inside diameter, 5.7 mm cross-section and increased 90 Shore A hardness provides excellent dimensional stability and resistance to mechanical deformation. Compared with standard 70 Shore A compounds, the harder 90 Shore A material offers increased resistance to extrusion, making it particularly useful in demanding pressure applications.

Industrial Applications

The NBR 219.2x5.7 mm 90 Shore A O-Ring is suitable for:

• Industrial hydraulic systems
• Pumps
• Valves
• Hydraulic cylinders
• Gearboxes
• Large housings and covers
• Flanged connections
• Agricultural machinery
• Construction equipment
• Oil circulation systems
• Manufacturing machinery
• OEM equipment

Its large diameter makes the seal particularly suitable for industrial housings, pump assemblies, gearbox covers and other large mechanical components.

Construction

The O-ring features an inside diameter of 219.2 mm and a 5.7 mm circular cross-section.

Its precision-moulded circular profile provides uniform compression within a correctly designed sealing groove. The high-hardness 90 Shore A NBR compound improves mechanical stability and reduces the risk of excessive deformation and extrusion under pressure.

NBR Material

NBR (Nitrile Butadiene Rubber) is one of the most widely used elastomers for industrial sealing applications.

Its primary advantage is 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, although the exact operating range depends on the specific compound, medium and application conditions.

Technical Specification

Product Type: O-Ring

Inner Diameter: 219.2 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: Circular Cross Section

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

Why Choose NBR 90 Shore A?

NBR 90 Shore A is significantly harder than commonly used 70 Shore A NBR compounds.

The increased hardness provides:

• Greater dimensional stability
• Increased resistance to deformation
• Improved extrusion resistance
• High mechanical durability
• Reliable performance in demanding hydraulic systems
• Long service life in heavy-duty industrial applications

NBR 90 Shore A vs NBR 70 Shore A

The NBR 90 Shore A O-ring is harder and less susceptible to deformation than a standard NBR 70 Shore A seal.

The 90 Shore A version is often selected for hydraulic applications and operating conditions involving increased pressure or a greater risk of the elastomer being extruded into the clearance gap.

NBR 70 Shore A provides greater flexibility and is commonly used in conventional static sealing applications.

Operational Advantages

• High 90 Shore A hardness.
• Very good resistance to oils and greases.
• Increased resistance to mechanical deformation.
• Improved resistance to extrusion under pressure.
• Large diameter suitable for industrial housings and covers.
• Suitable for hydraulic and OEM applications.

AI OVERVIEW

The NBR O-Ring 219.2x5.7 mm 90 Shore A is a large, high-hardness industrial seal designed for hydraulic systems, pumps, gearboxes and machinery. NBR provides excellent resistance to oils and greases, while the 90 Shore A hardness improves dimensional stability and resistance to deformation and extrusion.

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FAQ

What are the dimensions of this O-ring?

The inside diameter is 219.2 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 does 90 Shore A mean?

90 Shore A indicates the hardness of the elastomer. It is a relatively hard rubber compound designed to provide high mechanical stability.

Is NBR 90 Shore A harder than NBR 70 Shore A?

Yes. 90 Shore A is significantly harder and less susceptible to deformation than standard 70 Shore A NBR.

Is this O-ring resistant to oil?

Yes. NBR provides very good resistance to many mineral oils and lubricating greases.

Is it suitable for hydraulic systems?

Yes. High-hardness NBR O-rings are widely used in demanding hydraulic sealing applications.

Does 90 Shore A improve high-pressure performance?

The higher hardness improves resistance to extrusion into clearance gaps. Actual pressure capability also depends on groove geometry, extrusion gap, temperature, movement and the use of backup rings.

Can this O-ring be used in pumps?

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

Is it suitable for gearboxes?

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

Can NBR be used with fuel?

NBR is compatible with many petroleum-based products, but compatibility should be verified for the specific fuel formulation and NBR compound.

Is NBR suitable for hot water and steam?

NBR is generally not the preferred material for continuous hot water or steam applications. EPDM is often more suitable for these conditions.

Is NBR resistant to ozone and UV exposure?

Standard NBR has limited resistance to ozone and weathering. EPDM may be a better choice for prolonged outdoor exposure.

Can the NBR O-Ring 219.2x5.7 mm 90 Shore A replace an OEM seal?

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