O-ring 392x10 NBR

Applications

The O-Ring 392x10 mm NBR 70 Shore is engineered for large-diameter sealing tasks in heavy-duty industrial and hydraulic applications. With an inner diameter of 392 mm and a cross-section of 10 mm, this robust rubber gasket is ideal for pumping stations, large bore cylinders, drive shafts, gearbox housings and other major equipment requiring high-durability seals. Constructed from nitrile butadiene rubber (NBR) at a hardness of 70 Shore A, it is optimized for “industrial sealing ring”, “large-bore O-Ring”, “rubber seal NBR 70 Shore” and similar search terms used in procurement and engineering.

Advantages

• Large-format specification (392x10 mm) minimizes the need for multiple smaller seals, simplifying inventory and maintenance.

• NBR material (70 Shore A hardness) provides excellent resistance to mineral oils, greases and hydraulic fluids, while maintaining elasticity and sealing integrity under load and motion.

• High durability and wear resistance, ideal for demanding applications with repetitive motion or high fluid exposure.

• Versatile industrial usage across sectors: automotive, agriculture, hydraulics, heavy machinery, industrial automation systems.

• Procurement-friendly format facilitates B2B ordering of a standardized large-ID mechanical seal, aiding efficient stock management and quick deployment.

Technical Data

• Material: Nitrile Butadiene Rubber (NBR)

• Hardness: 70 Shore A

• Inner Diameter (ID): 392 mm

• Cross-Section (CS): 10 mm

• Suitable for static or limited dynamic sealing in hydraulic/pneumatic systems

• Operating temperature: approximately -30 °C to +100 °C (short-term higher possible depending on system)

• Media compatibility: Mineral oil-based oils, greases, aliphatic hydrocarbons, water up to ~80 °C in NBR format.

This product is ideal for engineers, maintenance managers and procurement officers specifying technical seals, shaft seals and high-durability rubber O-rings in large diameter formats.

FAQ

Q1: What does “392x10 mm” mean in the specification?
A1: It denotes an O-Ring with an inner diameter of 392 mm and a cross-section thickness of 10 mm, designed for large bore housings and sealing grooves.

Q2: Why use NBR at 70 Shore hardness?
A2: NBR (nitrile rubber) at 70 Shore A offers a solid balance of flexibility and strength, making it well-suited for oil- and grease-resistant environments common in industrial machinery and fluid-power systems.

Q3: Can this O-Ring be used for dynamic shaft sealing?
A3: Yes, while primarily suitable for static or slow dynamic sealing, the 10 mm cross-section and NBR compound support moderate motion and fluid contact. For high-speed rotary seals, a specialty seal may be preferable.

Q4: What industries commonly specify this size?
A4: Industries such as heavy machinery manufacturing, hydraulics, mobile equipment, agriculture, industrial pump & drive units often require large diameter seals like 392x10 mm for efficient equipment operation.

Q5: Are there limitations for using NBR 70 Shore?
A5: NBR performs excellently against oils and greases, but is less suited for very high temperatures (above ~120 °C continuously), aggressive solvents, ozone or UV exposure. Consider alternative elastomers (e.g., FKM/Viton) if such conditions apply.