O-Ring 387x5.3 NBR

Material Characteristics and Performance

The O-Ring 387x5.3 NBR 70 ShA is a precision-engineered sealing element made from nitrile rubber (NBR) with a standard hardness of 70 Shore A. This material is widely selected for industrial sealing due to its balance of flexibility, mechanical strength, and resistance to oil-based media. It ensures dependable sealing performance in static and moderate dynamic applications where dimensional stability and long service life are required.
NBR provides reliable resistance to mineral oils, hydraulic fluids, lubricants, fuels, and water. Its operating temperature range of approximately -30°C to +100°C makes it suitable for a broad spectrum of industrial environments. This O-ring serves as a durable rubber gasket and is commonly used for sealing interfaces to prevent leakage, pressure loss, or contamination within mechanical assemblies.

Applications in Industrial, Hydraulic, and Pneumatic Systems

The O-Ring 387x5.3 NBR 70 ShA is suitable for use in hydraulic cylinders, pneumatic actuators, pumps, valves, gear housings, pipe connections, and pressure vessels. It is frequently specified in manufacturing, machinery maintenance, automotive engineering, agricultural equipment, and equipment servicing.
Its large internal diameter and moderate cross-section make it suitable for sealing large flanges, covers, inspection ports, service openings, and structural housings where a reliable static seal is critical.

Availability and B2B Supply Logistics

This O-ring is maintained as part of our industrial sealing inventory for production facilities, maintenance teams, and technical distributors.
📍 Warehouse & Store: Lublin, ul. Smoluchowskiego 1, building 4
🚚 24h Delivery - fast order fulfillment across Poland and internationally.

FAQ

Is NBR 70 ShA suitable for hydraulic oil applications?
Yes. NBR is one of the most widely used elastomers in hydraulic systems due to its strong resistance to oil-based media and stable mechanical properties.

Can this O-ring be used in dynamic applications?
It may be used in low-speed dynamic seals, but it is primarily recommended for static sealing to ensure maximum service life.

What is the typical operating temperature range?
Approximately -30°C to +100°C, depending on pressure, medium, and application conditions.

Is 70 Shore A a standard hardness for industrial O-rings?
Yes. 70 ShA is the most common and versatile hardness for general-purpose sealing in hydraulic and pneumatic components.