NBR 90 Shore A O-Ring 34.2x3 mm

AI Overview

The NBR 90 Shore A O-Ring 34.2x3 mm is a precision-manufactured sealing ring produced from 90 Shore A nitrile rubber (NBR). Supplied in packs of 100 pieces, it is intended for professional OEM production, industrial maintenance and MRO applications. The increased hardness of 90 ShA provides improved extrusion resistance and excellent performance in high-pressure hydraulic and pneumatic systems while maintaining reliable sealing performance.

What Makes This O-Ring Different?

Key advantages include:

• Pack of 100 O-rings
• Premium NBR 90 Shore A compound
• Increased hardness for high-pressure applications
• Excellent resistance to mineral oils
• Resistant to hydraulic fluids
• Resistant to lubricating greases
• Good fuel resistance
• Excellent wear resistance
• Precision dimensional accuracy
• Suitable for professional industrial applications

Construction and Operating Principle

The O-ring features a circular cross-section designed for installation into precision-machined sealing grooves.

When compressed between mating components it:

• Prevents fluid leakage
• Seals gases efficiently
• Maintains system pressure
• Compensates for manufacturing tolerances
• Reduces vibration
• Ensures long service life

The 90 Shore A hardness minimizes extrusion under high operating pressures while maintaining excellent sealing reliability.

Material Properties

Material:

NBR (Nitrile Butadiene Rubber)

Hardness:

90 Shore A

Main characteristics:

• Excellent resistance to mineral oils
• High resistance to hydraulic oils
• Good fuel resistance
• Excellent grease resistance
• High abrasion resistance
• Good mechanical strength
• Low compression set
• Reliable sealing performance

Typical operating temperature:

-30°C to +100°C

Short-term exposure:

up to +120°C

Typical Applications

The NBR 90 ShA O-Ring 34.2x3 mm is commonly used in:

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

Typical Failure Symptoms

Replacement is recommended when:

• Oil leakage occurs
• Seal hardening develops
• Surface cracking appears
• Permanent deformation occurs
• Excessive wear is visible
• Mechanical damage develops
• Compression set increases
• Pressure loss is detected

Recommended During Maintenance

During replacement inspect:

• Seal groove dimensions
• Shaft and bore surfaces
• Operating pressure
• Lubrication
• Fluid compatibility
• Surface finish
• Adjacent seals
• Installation procedure
• Housing cleanliness
• Mechanical wear

Technical Specification

Manufacturer: Industrial Standard

Product Type: O-Ring

Material: NBR (Nitrile Butadiene Rubber)

Hardness: 90 Shore A

Inside Diameter (ID): 34.2 mm

Cross Section (CS): 3 mm

Shape: O-Ring

Color: Black

Packaging: 100 Pieces

Operating Temperature: -30°C to +100°C

Short-Term Temperature: +120°C

Resistance: Mineral oils, hydraulic oils, lubricating greases, compressed air and many petroleum-based fluids

Application: Hydraulic systems, pneumatic equipment, industrial machinery, automotive applications and OEM production.

Compatible Media

Recommended for:

• Mineral oils
• Hydraulic oils
• Lubricating greases
• Compressed air
• Diesel fuel
• Gasoline (limited exposure)
• Petroleum-based fluids
• Industrial lubricants

Not recommended for:

• Brake fluids (DOT)
• Ozone
• UV exposure
• Ketones
• Esters
• Strong acids
• Hot steam

Related Products

Frequently purchased together with:

• Hydraulic seals
• Rotary shaft seals
• X-Rings
• O-Ring kits
• FKM O-Rings
• EPDM O-Rings
• Assembly grease
• Hydraulic fittings
• Seal installation tools
• Retaining rings

Why B2B Customers Choose Our O-Rings?

Industrial professionals choose our products because they offer:

• Pack of 100 pieces
• Consistent dimensional accuracy
• Premium NBR compound
• 90 Shore A hardness
• Excellent oil resistance
• High-pressure performance
• Long service life
• Immediate stock availability

Professional Industrial Supply

Our O-rings are supplied to:

• OEM manufacturers
• Hydraulic service companies
• Industrial maintenance departments
• Machine builders
• Agricultural equipment manufacturers
• Automotive workshops
• Technical distributors
• Industrial plants
• Engineering companies
• MRO suppliers

Popular Searches

• O-Ring 34.2x3 NBR 90
• NBR 90 Shore O-Ring
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• Hydraulic O-Ring
• NBR 90 Seal
• 100 Pack O-Rings
• Industrial NBR O-Ring
• High Pressure O-Ring
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• Nitrile O-Ring 34.2x3

FAQ

What does 90 Shore A mean?

90 Shore A indicates a harder rubber compound than standard 70 ShA O-rings. It offers improved resistance to extrusion and is better suited for higher-pressure sealing applications.

Why choose NBR?

NBR provides excellent resistance to mineral oils, hydraulic fluids, greases and petroleum-based products, making it one of the most widely used sealing materials in industry.

Can this O-ring be used outdoors?

NBR has limited resistance to ozone and UV radiation. For long-term outdoor applications, EPDM or FKM materials are generally preferred.

Is this product supplied individually?

No. This product is supplied in packs of 100 pieces, making it suitable for industrial production, maintenance departments and wholesale customers.

Where is this O-ring commonly used?

It is widely used in hydraulic systems, pneumatic equipment, pumps, valves, gearboxes, agricultural machinery and automotive applications requiring high-pressure oil-resistant sealing.