70 Shore A Excellent Elasticity Oil Resistance O-Rings for Hydraulic Cylinders and Rubber O Rings Sealing

NBR 70 Shore A O-Rings with Excellent Elasticity and Oil Resistance for Hydraulic Cylinders

Custom-size NBR (Buna-N) O-rings are specified for replacement glands, prototype assemblies and dimensions outside standard size series. Provide inner diameter, cross-section and tolerances, together with nominal hardness and service conditions. A removed seal can help identify the part, but worn or swollen sample dimensions must be checked against the mating groove before tooling is agreed.

NBR 70 Shore A O-rings are designed for reliable sealing in hydraulic cylinders and industrial hydraulic systems. Manufactured from nitrile butadiene rubber (NBR), these rubber sealing rings offer excellent elasticity, good oil resistance, and reliable sealing performance in contact with compatible hydraulic fluids.

With a standard hardness of 70 Shore A, these NBR O-rings provide a balance between flexibility and mechanical strength. Their elastic recovery helps maintain sealing contact between mating surfaces, reducing the risk of hydraulic fluid leakage during equipment operation.

Suitable for both static and selected dynamic sealing applications, NBR 70 Shore A O-rings are commonly used in hydraulic cylinder pistons, piston rods, hydraulic valves, pumps, and fluid connections.

Custom dimensions, material specifications, and hardness options are available to meet different sealing requirements.

NBR (Nitrile Butadiene Rubber), also known as Buna-N, is widely used in industrial sealing applications due to its excellent balance of oil resistance, elasticity, and mechanical properties.

• Excellent Elasticity and Recovery

NBR provides good elastic recovery after compression and deformation. This allows the O-ring to maintain sealing contact with mating surfaces and helps reduce leakage during hydraulic system operation.

• Good Resistance to Hydraulic Oil

NBR offers good compatibility with many petroleum-based hydraulic oils, lubricating oils, and mineral oils. It helps maintain sealing performance when exposed to compatible oil-based media.

• 70 Shore A Hardness for Balanced Sealing

The 70 Shore A hardness grade provides a practical balance between flexibility and resistance to deformation. It allows the O-ring to adapt to the sealing groove while maintaining sufficient mechanical strength.

• Good Abrasion and Wear Resistance

NBR has good resistance to abrasion and mechanical wear, making it suitable for industrial equipment and selected reciprocating sealing applications.

• Cost-Effective Sealing Material

NBR provides reliable performance at a competitive cost, making it a popular choice for general-purpose hydraulic and industrial sealing applications.

Capabilities

• Mold to AS568 dash sizes and ISO 3601 metric dimensions
• Non-standard cross-sections and diameters from drawing or sample
• Specify low-temperature, color or food-contact requirements for compound review
• Review sample dimensions against the gland drawing before reproducing an obsolete seal

FAQ

Q: What do you need to make a custom O-ring?
A: Send ID, cross-section and tolerances, or a dimensioned drawing. Include groove dimensions, fluid, pressure, temperature, nominal hardness and quantity. For a sample, identify whether it is new or used so wear, stretch and swelling are considered.

Q: Can you match AS568 and metric sizes exactly?
A: Specify the AS568 dash number or metric dimensions and the required tolerance class. Standard sizes have defined tolerances rather than zero dimensional variation. Custom dimensions and inspection criteria should be agreed on the drawing.

Q: What are NBR 70 Shore A O-rings used for?

A: NBR 70 Shore A O-rings are commonly used in hydraulic cylinders, hydraulic pumps, valves, and industrial machinery. They provide sealing against compatible hydraulic oils and other petroleum-based fluids in both static and selected dynamic applications.