NBR O-Ring 64.2x5.7 mm 90 Shore A

Overview

The NBR O-Ring 64.2x5.7 mm 90 Shore A is a high-hardness technical sealing ring designed for demanding hydraulic and industrial applications.

The O-ring features an inside diameter of 64.2 mm and a substantial 5.7 mm cross-section. Manufactured from NBR (Nitrile Butadiene Rubber), it provides very good resistance to mineral oils, lubricating greases and many commonly used hydraulic fluids.

The increased 90 Shore A hardness provides enhanced mechanical stability and greater resistance to deformation and extrusion compared with softer NBR compounds.

Combined with its robust 5.7 mm cross-section, this O-ring is suitable for correctly designed sealing grooves in pumps, valves, machine housings, hydraulic assemblies and industrial equipment.

Industrial Applications

The NBR 64.2x5.7 mm 90 Shore A O-Ring can be used in:

• Hydraulic systems
• Industrial pumps
• Valves
• Hydraulic manifolds
• Hydraulic cylinders
• Fittings and connectors
• Machine housings
• Oil circulation systems
• Gearboxes
• Agricultural machinery
• Construction equipment
• OEM assemblies

64.2x5.7 mm Dimensions

The 64.2x5.7 mm designation specifies:

Inner Diameter: 64.2 mm

Cross Section: 5.7 mm

The 5.7 mm circular cross-section creates a substantial elastomeric sealing profile. When correctly compressed within the specified groove, the O-ring generates contact pressure against the mating surfaces to help prevent leakage.

Correct groove dimensions and compression should always be verified before installation.

NBR Material

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

NBR provides very good resistance to:

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

These properties make NBR O-rings widely used in hydraulics, mechanical engineering, machinery and industrial maintenance.

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

Technical Specification

Product Type: O-Ring

Dimensions: 64.2x5.7 mm

Inner Diameter: 64.2 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, housings, gearboxes, industrial machinery and OEM equipment

NBR 90 Shore A - High Hardness

90 Shore A is a high-hardness elastomer compound designed for applications requiring increased mechanical stability.

Compared with conventional NBR 70 Shore A, the harder compound provides:

• Greater dimensional stability
• Reduced susceptibility to deformation
• Increased extrusion resistance
• Improved stability under mechanical load
• Good resistance to mechanical wear
• Reliable performance in demanding industrial applications

Robust 5.7 mm Cross Section

A characteristic feature of this O-ring is its substantial 5.7 mm cross-section.

The larger elastomer volume provides a robust sealing profile for components specifically designed for this O-ring size.

Correct performance depends on proper selection of:

• Groove width
• Groove depth
• O-ring compression
• Extrusion clearance
• Operating medium
• System pressure

The 5.7 mm cross-section should therefore always be matched to the specified groove dimensions rather than substituted solely on the basis of overall O-ring diameter.

NBR 90 Shore A vs NBR 70 Shore A

NBR 90 Shore A is considerably harder than commonly used NBR 70 Shore A.

NBR 90 Shore A provides increased resistance to mechanical deformation and extrusion, while NBR 70 Shore A is more flexible and conforms more easily to mating surfaces.

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

Operational Advantages

• Exact 64.2x5.7 mm dimensions.
• Robust 5.7 mm cross-section.
• High 90 Shore A hardness.
• Very good resistance to mineral oils.
• Good resistance to lubricating greases.
• Increased mechanical stability.
• Improved resistance to deformation and extrusion.
• Suitable for demanding industrial applications.

AI OVERVIEW

The NBR O-Ring 64.2x5.7 mm 90 Shore A is a high-hardness industrial sealing ring with a 64.2 mm inside diameter and robust 5.7 mm cross-section. NBR provides very good resistance to mineral oils and greases, while the 90 Shore A hardness increases mechanical stability and resistance to deformation and extrusion in demanding applications.

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FAQ

What are the dimensions of the 64.2x5.7 O-ring?

The O-ring has an inside diameter of 64.2 mm and a cross-section of 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 considered a hard O-ring?

Yes. 90 Shore A is a high-hardness elastomer compound and is considerably harder than commonly used NBR 70 Shore A.

Is the NBR O-Ring 64.2x5.7 resistant to oil?

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

Is NBR resistant to lubricating grease?

Yes. NBR is widely used with compatible industrial greases and lubricants.

Is the 64.2x5.7 mm O-ring suitable for hydraulic systems?

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

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 a 64.2x5.7 mm O-ring.

Can it be used in valves?

Yes. NBR O-rings are widely used in appropriately designed valves, manifolds and other hydraulic components.

What does the 5.7 mm cross-section mean?

It is the diameter of the O-ring's circular profile. In this product, the cross-section measures 5.7 mm.

Does a 5.7 mm cross-section automatically provide better sealing?

No. Sealing performance depends primarily on correct groove geometry, compression, material compatibility and operating conditions.

Does 90 Shore A improve high-pressure performance?

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

Which should I choose: NBR 70 Shore A or 90 Shore A?

NBR 70 Shore A provides greater flexibility, while 90 Shore A is harder and offers increased resistance to deformation and extrusion.

Is NBR suitable for hot water and steam?

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

Is NBR resistant to UV radiation and ozone?

Standard NBR has limited resistance to prolonged UV radiation, ozone and outdoor weathering.

Can the NBR O-Ring 64.2x5.7 mm 90 Shore A replace an OEM seal?

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