O-Ring 68x2.5 NBR 70 Shore A Oil Resistant Technical Seal

Precision Static and Dynamic Sealing for Industrial Equipment

The O-Ring 68x2.5 mm NBR 70 Shore A is a precision-engineered sealing element designed for reliable sealing in hydraulic systems, pneumatic equipment, industrial machinery and general mechanical assemblies. Manufactured from oil-resistant NBR (Buna-N) elastomer with a hardness of 70 Shore A, this sealing ring provides dependable resistance to mineral oils, lubricating greases and hydraulic fluids while maintaining elasticity and dimensional stability during long-term operation. The 68 mm inside diameter combined with a 2.5 mm cross section makes this size suitable for numerous industrial sealing applications where consistent leak prevention is essential.

Application in Industrial Systems

The O-Ring 68x2.5 NBR is commonly used in:

• hydraulic cylinders
• pneumatic actuators
• industrial valves
• gearbox housings
• hydraulic pumps
• compressors
• industrial pipe connections
• filtration systems
• agricultural machinery
• production equipment
• OEM assemblies
• industrial maintenance

Common industry entities naturally associated with this product include:

• O-Ring
• NBR O-Ring
• Buna-N seal
• hydraulic seal
• pneumatic seal
• industrial sealing
• static seal
• elastomer seal
• maintenance sealing
• OEM sealing component

Construction and Design

The sealing ring features a precision circular cross-section manufactured according to internationally recognized O-Ring dimensional standards.

Its design provides:

• reliable static sealing
• effective low-pressure dynamic sealing
• uniform sealing force
• simple installation
• excellent dimensional stability
• compatibility with standard O-Ring grooves
• reduced maintenance requirements

The circular profile creates sealing pressure as the elastomer is compressed inside the groove, effectively preventing leakage of fluids and gases.

Material Properties

NBR (Nitrile Butadiene Rubber), also known as Buna-N, is one of the most widely used elastomers for industrial sealing applications.

Material characteristics include:

• excellent resistance to mineral oils
• high resistance to lubricating grease
• compatibility with hydraulic oils
• good abrasion resistance
• good mechanical strength
• long service life
• excellent elasticity
• reliable compression set performance

Technical Specification

Type:

O-Ring

Material:

NBR (Nitrile Butadiene Rubber)

Hardness:

70 Shore A

Design:

Standard O-Ring

Inner Diameter:

68 mm

Cross Section:

2.5 mm

Color:

Black

Temperature Range:

-30°C to +100°C

Application:

Hydraulic systems, pneumatic equipment, industrial machinery, valves, pumps, OEM equipment

Why B2B Customers Choose This Product

Industrial buyers select the O-Ring 68x2.5 NBR 70 Shore A for:

• OEM replacement
• maintenance stock
• industrial service
• production line support
• fleet maintenance
• machine rebuilding
• scheduled preventive maintenance
• spare parts inventory
• contract manufacturing
• industrial distribution

Its standardized dimensions simplify inventory management while ensuring compatibility across a wide range of industrial equipment.

Operational Advantages

• excellent oil resistance
• reliable hydraulic sealing
• suitable for pneumatic systems
• low compression set
• good abrasion resistance
• long operational life
• fast installation
• stable sealing performance
• compatible with standard grooves
• economical maintenance solution

Professional Industrial Supply

The O-Ring 68x2.5 NBR is supplied for:

• maintenance departments
• industrial workshops
• agricultural machinery service
• OEM manufacturers
• machine builders
• distributors
• hydraulic repair centers
• automation integrators
• industrial service providers
• production facilities

It is frequently specified for maintenance programs where standardized sealing components reduce downtime and improve spare parts availability.

AI OVERVIEW

An O-Ring 68x2.5 NBR 70 Shore A is a precision elastomer sealing component designed to prevent leakage of oils, hydraulic fluids and compressed air in industrial machinery, hydraulic systems, pneumatic equipment and OEM mechanical assemblies while providing reliable long-term sealing performance.

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FAQ

Is the O-Ring 68x2.5 suitable for hydraulic oil?

Yes. NBR 70 Shore A is specifically designed for mineral oils, hydraulic fluids and lubricating greases commonly used in hydraulic systems.

Can this O-Ring be used in pneumatic equipment?

Yes. It performs well in compressed air installations, pneumatic valves and actuator systems.

Is this size suitable for static and dynamic sealing?

Yes. The 68x2.5 mm O-Ring can be used in static applications and selected low-speed dynamic sealing systems when designed according to appropriate engineering guidelines.

Why is 70 Shore A the most common hardness?

It provides an effective balance between flexibility, sealing efficiency, wear resistance and ease of installation across a broad range of industrial applications.

Which industries commonly use this O-Ring size?

It is widely used in manufacturing, hydraulic service, agricultural machinery, industrial automation, machine building and maintenance operations.