O-ring 219,2x4 NBR

Applications and Typical Uses

The O-Ring 219x4 NBR 70 ShA is a robust rubber gasket / sealing ring designed for use in a wide range of industrial applications. Thanks to its size (inner diameter 219 mm, cross-section 4 mm) and material properties, it is perfectly suited for use in hydraulic and pneumatic systems, pumps, valves, cylinders, tanks, gearboxes, bearing housings, and fluid-handling equipment. Its dimensions and sealing performance make it an ideal choice for both OEM production lines and maintenance / retrofit operations in heavy-duty industrial machinery.

Material Properties & Performance

This O-Ring is manufactured from NBR (nitrile butadiene rubber) with a durometer hardness of 70 Shore A, which provides an optimal balance between elasticity, chemical resistance, mechanical strength and dimensional stability. NBR is widely used across industries precisely because of its resistance to oils, hydraulic fluids, greases, fuels, and many standard industrial chemicals.

The 219x4 O-Ring exhibits high durability, low compression set, and strong sealing under pressures and frequent pressure cycles. It maintains sealing integrity even under vibration, temperature fluctuations, or dynamic motion — making it a reliable static or dynamic seal depending on system requirements.

Key Benefits & Why Choose This O-Ring

• Chemical and oil resistance — thanks to NBR, the seal resists degradation by hydraulic oils, greases, fuels, water-glycol fluids and many industrial media, ensuring long service life even in aggressive environments.

• Compact cross-section (4 mm) — suitable for installations with limited groove depth or narrow sealing chambers, while still delivering reliable seal performance.

• Large standard size (219 mm inner diameter) — simplifies procurement and replacement in machinery using large-bore cylinders, housings, or flanges.

• Versatility — effective for hydraulic, pneumatic, gearbox, gearbox housing, pump, valve, tank and bearing-housing applications.

• Durability & mechanical resilience — tolerates pressure cycles, vibrations and mechanical loads without excessive wear or deformation, reducing maintenance intervals and downtime.

FAQ

Is O-Ring 219x4 NBR 70 ShA suitable for sealing hydraulic oil systems?
Yes. The NBR material is highly resistant to mineral oils, hydraulic fluids and greases — making this seal well suited for hydraulic pumps, valves and cylinders.

Can this O-Ring be used in pneumatic systems or air-handling devices?
Yes. Its elastic sealing properties and correct geometry make it effective for pneumatic applications as well, provided operating pressures and temperatures are within NBR’s range.

What temperature range can this O-Ring tolerate?
Standard NBR 70 ShA seals operate reliably across typical industrial temperature ranges. For standard hydraulic and pneumatic systems, this material offers good performance under normal ambient and operating temperatures.

Is the 4 mm cross-section enough for reliable sealing in larger diameters?
Yes. For applications with proper groove design and correct installation, a 4 mm cross-section still provides effective sealing and mechanical resilience even at larger diameters like 219 mm.

Why choose NBR 70 ShA instead of a softer or harder elastomer?
NBR 70 ShA offers a practical balance: enough hardness to resist pressure and extrusion, yet sufficient elasticity to maintain a tight seal and compensate for minor surface irregularities. It represents a cost-effective and versatile solution for many industrial sealing needs.