NBR O-Ring 174.2x5.7 mm 90 Shore A

AI Overview

The NBR O-Ring 174.2x5.7 mm 90 Shore A is a precision elastomer sealing ring designed for static and dynamic sealing applications in industrial, hydraulic and pneumatic systems. Manufactured from NBR (Nitrile Butadiene Rubber) with a hardness of 90 Shore A, it offers excellent resistance to mineral oils, lubricating greases, hydraulic fluids and aliphatic fuels while providing high wear resistance and reliable sealing performance under demanding operating conditions.

The 174.2 mm inside diameter and 5.7 mm cross-section make this O-ring suitable for OEM equipment, industrial machinery, pumps, valves, hydraulic cylinders and general maintenance applications.

What Makes This O-Ring Different?

Key advantages include:

• Precision manufactured dimensions
• Premium NBR (Nitrile Butadiene Rubber)
• Hardness: 90 Shore A
• Excellent oil resistance
• High abrasion resistance
• Reliable sealing performance
• Good compression set resistance
• Long service life
• Suitable for static and dynamic applications
• OEM-quality sealing solution

Construction and Operating Principle

An O-ring is a toroidal elastomer seal designed to fit into a machined groove.

When compressed between two mating surfaces, it creates a reliable seal by:

• Preventing leakage of liquids
• Preventing leakage of gases
• Compensating for manufacturing tolerances
• Maintaining sealing pressure
• Absorbing vibration
• Reducing maintenance requirements

The 90 Shore A hardness provides increased resistance to extrusion under higher operating pressures.

Material Properties

The seal is manufactured from NBR (Nitrile Butadiene Rubber).

Material characteristics include:

• Excellent resistance to mineral oils
• Excellent grease resistance
• Good resistance to hydraulic oils
• Good fuel resistance
• High abrasion resistance
• Good tensile strength
• Good ageing resistance
• Reliable performance in industrial environments

Typical operating temperature:

-30°C to +100°C

(short-term exposure up to approximately +120°C depending on operating conditions).

Typical Applications

Common applications include:

• Hydraulic cylinders
• Hydraulic valves
• Pneumatic systems
• Pumps
• Gearboxes
• Industrial machinery
• Agricultural equipment
• Construction equipment
• Automotive systems
• OEM maintenance

Typical Failure Symptoms

Replacement is recommended if any of the following are observed:

• Oil leakage
• Air leakage
• Visible cracks
• Permanent deformation
• Hardening
• Swelling
• Cuts or tears
• Loss of elasticity

Recommended During Maintenance

During replacement it is recommended to inspect:

• Groove condition
• Shaft or piston surface
• Housing surface
• Hydraulic fluid quality
• Lubrication
• Mating components
• Installation tools
• Seal compatibility
• Operating pressure
• Operating temperature

Technical Specification

Manufacturer: Industrial Standard

Product Type: O-Ring

Material: NBR (Nitrile Butadiene Rubber)

Hardness: 90 Shore A

Inside Diameter (ID): 174.2 mm

Cross Section (CS): 5.7 mm

Shape: O-Ring

Color: Black

Temperature Range: -30°C to +100°C

Resistance: Mineral oils, greases, hydraulic fluids, aliphatic fuels

Application: Hydraulic, pneumatic, industrial and automotive sealing systems.

Compatible Media

Suitable for:

• Mineral oils
• Lubricating greases
• Hydraulic oils
• Compressed air
• Water (within NBR limitations)
• Aliphatic hydrocarbons

Not recommended for prolonged exposure to:

• Ozone
• Weathering
• Strong acids
• Ketones
• Ester-based brake fluids
• Aromatic hydrocarbons

Related Products

Frequently purchased together with:

• Rotary shaft seals
• Hydraulic seals
• Backup rings
• X-rings
• O-ring kits
• Bearing grease
• Hydraulic oil
• Seal installation tools
• Retaining rings
• Shaft sleeves

Why B2B Customers Choose Our O-Rings?

Professional maintenance companies choose these sealing rings because of:

• Precision dimensions
• Consistent material quality
• OEM-compatible performance
• Excellent durability
• Reliable sealing
• Wide industrial compatibility
• Fast availability
• Cost-effective maintenance

Professional Industrial Supply

This O-ring is regularly supplied to:

• Industrial maintenance departments
• Hydraulic repair companies
• Pneumatic service providers
• Machine manufacturers
• Agricultural equipment workshops
• Automotive repair facilities
• Technical distributors
• OEM maintenance companies
• Manufacturing plants
• Engineering workshops

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FAQ

What does 90 Shore A mean?

90 Shore A indicates a harder rubber compound than the standard 70 Shore A, providing greater resistance to extrusion and high-pressure applications.

What is NBR?

NBR (Nitrile Butadiene Rubber) is one of the most commonly used sealing elastomers due to its excellent resistance to mineral oils, greases and hydraulic fluids.

Can this O-ring be used in hydraulic systems?

Yes. NBR 90 Shore A O-rings are widely used in hydraulic equipment operating with mineral oil-based hydraulic fluids.

Is this O-ring suitable for dynamic sealing?

Yes. It can be used in many reciprocating dynamic sealing applications when correctly designed and installed.

How should an O-ring be installed?

The groove and mating surfaces should be clean, lightly lubricated when appropriate, and free from burrs or sharp edges to avoid damaging the seal during installation.