O-ring 280x5.3 mm NBR

Technical Specifications of the O-ring 280x5.3 mm NBR 70 ShA

The O-ring Ø280x5.3 mm is a precision-engineered rubber seal made from high-quality nitrile butadiene rubber (NBR) with a hardness of 70 ShA. NBR is one of the most commonly used elastomers for industrial sealing applications thanks to its excellent resistance to mineral oils, fuels, greases, and many chemical substances.
The typical working temperature range for NBR 70 ShA is from -30 °C to +120 °C, making this O-ring suitable for a wide range of industrial applications. Its large inner diameter (280 mm) and cross-section (5.3 mm) make it ideal for use in larger static or semi-dynamic assemblies such as pumps, tanks, valves, and heavy machinery.
The NBR 70 ShA composition offers a balance between flexibility and mechanical strength, ensuring reliable sealing and long service life.

Applications in Hydraulics, Pneumatics and Industrial Equipment

The O-ring 280x5.3 mm NBR 70 ShA is designed for use in hydraulic and pneumatic systems, process machinery, production equipment, and technical installations requiring durable sealing solutions. It provides excellent oil and fuel resistance, making it suitable for sealing hydraulic fluid circuits, compressed air systems, and lubricated mechanical assemblies.
This O-ring functions effectively as a static or low-dynamic seal, helping to prevent fluid leakage and maintain system efficiency. Its resistance to wear and compression set makes it an optimal choice for maintenance departments, B2B distributors, and industrial manufacturers.

📍 Warehouse and Shop: Lublin, ul. Smoluchowskiego 1, building 4
🚚 Delivery within 24 hours - fast order processing and shipping for B2B clients

Installation, Durability and Operating Guidelines

Before installation, ensure that all contact surfaces are clean, smooth and free from sharp edges. For easier assembly and longer seal life, use a compatible mounting lubricant. The NBR 70 ShA material provides good stability and resistance under pressure and varying temperatures, ensuring consistent sealing performance.
Although NBR performs excellently in contact with oils and standard industrial media, it is not recommended for applications involving strong oxidizing agents or extreme heat above +120 °C. For high-temperature or chemically aggressive environments, FKM/Viton materials may be more suitable.

FAQ - Frequently Asked Questions

1. What material is the O-ring made from?
It’s made from NBR (nitrile butadiene rubber), which provides excellent resistance to oils, greases, and fuels - ideal for hydraulic and pneumatic sealing applications.

2. What is the typical temperature range for NBR 70 ShA O-rings?
From -30 °C to +120 °C, depending on the working environment and medium type.

3. Where can this O-ring be used?
It’s suitable for hydraulic and pneumatic systems, pumps, valves, tanks, and heavy machinery requiring reliable static or semi-dynamic sealing.

4. Can it be used in dynamic applications?
Yes, in low-dynamic conditions, provided that proper groove dimensions and assembly procedures are maintained.

5. How quickly is the product delivered and from where?
Orders are fulfilled from our warehouse in Lublin, ul. Smoluchowskiego 1, building 4, with 24-hour delivery for B2B customers across Poland and the EU.