NBR 70 Shore A O-Ring 34.2x3 mm

AI Overview

The NBR 70 Shore A O-Ring 34.2x3 mm is a precision-engineered nitrile rubber (NBR) sealing ring designed for reliable static and dynamic sealing applications. Supplied in packs of 100 pieces, it is an excellent choice for OEM manufacturers, industrial maintenance, repair workshops and wholesale distribution. The standard 70 Shore A hardness provides an excellent balance of flexibility, durability and sealing performance across a wide range of industrial applications involving oils and petroleum-based fluids.

What Makes This O-Ring Different?

Key advantages include:

• Pack of 100 O-rings
• Premium NBR rubber compound
• Standard 70 Shore A hardness
• Excellent flexibility
• Outstanding resistance to mineral oils
• Excellent resistance to hydraulic fluids
• Good fuel resistance
• High abrasion resistance
• Precision dimensional accuracy
• Long service life

Construction and Operating Principle

The O-ring features a precision circular cross-section designed to fit into standard sealing grooves.

When compressed between mating surfaces it:

• Prevents fluid leakage
• Seals gases effectively
• Maintains operating pressure
• Compensates for dimensional tolerances
• Reduces vibration
• Provides long-lasting sealing performance

The 70 Shore A hardness ensures excellent adaptability to sealing surfaces while maintaining reliable compression and elasticity.

Material Properties

Material:

NBR (Nitrile Butadiene Rubber)

Hardness:

70 Shore A

Key properties:

• Excellent resistance to mineral oils
• High resistance to hydraulic oils
• Good resistance to fuels
• Excellent grease resistance
• High abrasion resistance
• Good mechanical strength
• Excellent elasticity
• Low compression set

Typical operating temperature:

-30°C to +100°C

Short-term exposure:

up to +120°C

Typical Applications

The NBR 70 Shore A O-Ring 34.2x3 mm is widely used in:

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

Typical Failure Symptoms

Replace the O-ring if any of the following occurs:

• Oil leakage
• Loss of elasticity
• Surface cracking
• Permanent deformation
• Mechanical damage
• Excessive wear
• Pressure loss
• Reduced sealing performance

Recommended During Maintenance

During replacement inspect:

• Seal groove condition
• Mating surfaces
• Operating pressure
• Fluid compatibility
• Lubrication
• Installation procedure
• Adjacent seals
• Shaft or piston rod condition
• Housing cleanliness
• Mechanical wear

Technical Specification

Manufacturer: Industrial Standard

Product Type: O-Ring

Material: NBR (Nitrile Butadiene Rubber)

Hardness: 70 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: Up to +120°C

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

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

Compatible Media

Recommended for use with:

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

Not recommended for use with:

• DOT brake fluids
• Ozone
• UV radiation
• Ketones
• Esters
• Strong acids
• Hot steam

Related Products

Frequently purchased together with:

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

Why B2B Customers Choose Our O-Rings?

Industrial professionals choose our O-rings because they provide:

• Pack of 100 pieces
• Premium NBR compound
• Precision manufacturing
• Standard 70 Shore A hardness
• Excellent oil resistance
• High sealing reliability
• 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 machinery manufacturers
• Automotive workshops
• Technical distributors
• Industrial plants
• Engineering companies
• MRO suppliers

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FAQ

What does 70 Shore A mean?

70 Shore A is the standard hardness for most industrial O-rings. It offers an excellent balance of flexibility, durability and sealing performance for a wide range of hydraulic, pneumatic and industrial applications.

Why choose NBR?

NBR (Nitrile Butadiene Rubber) provides excellent resistance to mineral oils, hydraulic fluids, lubricating greases and fuels, 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 (Viton®) materials are generally recommended.

Is this product sold individually?

No. This product is supplied in packs of 100 pieces, making it ideal 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, hydraulic cylinders, gearboxes, agricultural machinery, industrial equipment and automotive applications.