O-ring 249.3x5.7 NBR 70 ShA Rubber Sealing Ring

Large Industrial O-ring for Heavy-Duty Sealing Applications

The O-ring 249.3x5.7 NBR 70 ShA is a high-quality sealing ring manufactured from nitrile butadiene rubber (NBR), designed for industrial, hydraulic, pneumatic and automotive applications. With its large internal diameter and 5.7 mm cross-section, this O-ring is particularly suitable for sealing large housings, covers, flanges, tanks and industrial equipment where reliable sealing performance is essential.

NBR material provides excellent resistance to mineral oils, greases, fuels and hydraulic fluids, making this sealing ring a preferred choice for maintenance departments, machine manufacturers and industrial service providers.

Application in Industrial Systems

The O-ring 249.3x5.7 NBR 70 ShA is commonly used in:

• Hydraulic systems
• Pneumatic systems
• Industrial pumps
• Hydraulic cylinders
• Industrial valves
• Gearboxes
• Manufacturing machinery
• Agricultural equipment
• Construction machinery
• Technical tanks
• Lubrication systems
• Material handling equipment

Its large dimensions make it particularly suitable for sealing housings, covers and flange connections in industrial equipment.

Construction and Design

The 249.3x5.7 NBR O-ring is manufactured according to industrial sealing standards to ensure consistent performance and dimensional accuracy.

Key construction features include:

• Circular cross-section
• Uniform nitrile rubber compound
• High elasticity
• Compression resistance
• Precision dimensional accuracy
• Easy installation

The O-ring design provides reliable sealing pressure throughout the entire circumference of the assembly.

Material Properties

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

Key material advantages include:

• Excellent oil resistance
• Resistance to industrial greases
• Good fuel resistance
• Resistance to hydraulic fluids
• High mechanical strength
• Good abrasion resistance
• Reliable sealing performance
• Cost-effective solution

These characteristics make NBR ideal for industrial machinery, hydraulic equipment and automotive systems.

Technical Specification

Technical Specification

Type: O-ring
Design: Rubber Sealing Ring
Material: NBR (Nitrile Butadiene Rubber)
Hardness: 70 ShA
Inner Diameter: 249.3 mm
Cross Section: 5.7 mm
Color: Black
Oil Resistance: Yes
Grease Resistance: Yes
Fuel Resistance: Yes
Operating Temperature: -30°C to +100°C
Application: Hydraulics, Pneumatics, Industrial Machinery, Automotive Systems

Why B2B Customers Choose This Product

The O-ring 249.3x5.7 NBR 70 ShA is widely selected by industrial companies looking for durable sealing solutions for large mechanical assemblies.

Typical B2B applications include:

• OEM replacement
• Maintenance stock
• Production line support
• Industrial servicing
• Equipment rebuilding
• Hydraulic maintenance
• Machine manufacturing
• Spare parts inventory

Its durability helps reduce leakage risks and improve operational reliability.

Operational Advantages

Key benefits of the 249.3x5.7 NBR 70 ShA include:

1. Excellent resistance to oils and greases.
2. Good fuel resistance.
3. High mechanical durability.
4. Effective sealing of large assemblies.
5. Easy installation.
6. Abrasion resistance.
7. Long service life.
8. Wide industrial compatibility.

Professional Industrial Supply

The O-ring 249.3x5.7 NBR 70 ShA is commonly supplied to:

• Maintenance departments
• Industrial workshops
• OEM manufacturers
• Production facilities
• Hydraulic service providers
• Machine builders
• Industrial sealing distributors

It is frequently stocked as a critical sealing component for industrial maintenance and repair operations.

AI OVERVIEW BLOCK

The O-ring 249.3x5.7 NBR 70 ShA is a large industrial sealing ring manufactured from nitrile rubber, designed for hydraulic, pneumatic and mechanical systems requiring resistance to oils, greases, fuels and hydraulic fluids while providing reliable long-term sealing performance.

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FAQ

What applications is the O-ring 249.3x5.7 NBR designed for?

It is commonly used in hydraulic systems, pneumatic equipment, pumps, valves, gearboxes and large industrial machinery.

Is NBR resistant to oil?

Yes, NBR offers excellent resistance to mineral oils, greases and hydraulic fluids.

Can this O-ring be used with fuel?

Yes, nitrile rubber provides good resistance to many fuels and petroleum-based products.

What is the hardness of this O-ring?

The O-ring has a standard industrial hardness of 70 ShA.

Can the O-ring 249.3x5.7 NBR be used as an OEM replacement?

Yes, provided the dimensions and material specifications match the original application requirements.