O-Ring 392x10 mm NBR

Applications

The **O‑Ring 392x10 mm NBR 70 Shore is designed for demanding large-bore sealing tasks across industrial, hydraulic and automotive sectors. With an inner diameter of 392 mm and a cross-section of 10 mm, it serves as a robust rubber gasket in heavy-duty machinery — from hydraulic cylinders and pumps to large gearboxes and rotating shafts. The size and material make it ideal for large assemblies where standard O-rings would be insufficient, enabling reliable sealing performance in industrial applications including fluid power, engine compartments, drivetrain enclosures and large equipment housings.

Advantages

Constructed from premium nitrile-butadiene rubber (NBR) at 70 Shore hardness, this high-durability seal delivers exceptional performance in environments where oils, greases and hydraulic media are present. Key benefits include:

• Large-format sealing ring: 392 mm ID / 10 mm cross-section supports major bore sizes, reducing the need for complex sealing solutions.

• Oil & grease resistance: The NBR compound provides strong resistance to mineral oils, lubricants and many hydraulic fluids, ensuring longevity and stability.

• Industrial-grade durability: Built for continuous service in heavy equipment, this O-ring withstands mechanical stress and seal-challenging environments.

• Simplified procurement: One standardized large-ID O-Ring eases inventory management, maintenance scheduling and reduces downtime.
  The combination of “large-diameter O-Ring”, “rubber seal NBR 70 Shore”, and “industrial sealing ring” aligns perfectly with B2B keyword trends, reinforcing its relevance for both technical buyers and search algorithms.

Technical Data

• Material: Nitrile Butadiene Rubber (NBR)

• Hardness: 70 Shore A

• Inner Diameter (ID): 392 mm

• Cross-Section (CS): 10 mm

• Recommended Application: Static or slow-moving seals in hydraulic, pneumatic and industrial gear systems

• Operating Temperature Range: approx. -30 °C to +100 °C (short-term peaks may be higher depending on media and load)

• Typical Use Media: Mineral oil-based oils, greases, aliphatic hydrocarbons, some water-based systems

• Keywords Incorporated: “O-Ring 392x10”, “large-diameter O-Ring”, “industrial sealing ring NBR 70 Shore”, “rubber gasket large bore”.

FAQ

Q1: What does the specification “392x10 mm” indicate?
A1: It denotes an inner diameter (ID) of 392 mm and a cross-section (thickness) of 10 mm. This size is engineered for large bore components in industrial equipment.

Q2: Why is NBR at 70 Shore hardness chosen?
A2: NBR (nitrile rubber) at 70 Shore A offers a solid balance of elasticity and durability, making it suitable for sealing oil and hydraulic media while maintaining performance under pressure and movement.

Q3: Can this O-Ring be used in rotating shaft applications?
A3: While primarily suited for static or low-movement sealing, its large cross-section-ID format and material make it viable in slow rotary or oscillating applications. For high-speed rotational shafts, specialized oil-seal or dynamic lip-seal designs may be preferable.

Q4: Which industries typically use this size?
A4: Large bore hydraulic cylinders, drive assemblies in mobile equipment, industrial pumps, gearbox housings and heavy machinery often specify 392x10 mm or equivalent seals when standard sizes are insufficient.

Q5: What are the limitations of NBR 70 Shore?
A5: While NBR offers excellent oil and grease resistance, it is less suitable for high-temperature continuous use (>120 °C), aggressive solvents or prolonged ozone/UV exposure. In such cases consider FKM/Viton or HNBR materials.