O-Ring 290 x 5.3 mm NBR

Applications

The metric O-Ring 290 x 5.3 mm made of nitrile-butadiene rubber (NBR) with a hardness of 70 ShA is engineered for demanding B2B settings. As a high-precision rubber gasket and industrial sealing ring, it is ideal for static and light dynamic sealing applications in hydraulics, pneumatics, fluid power systems, valves, pumps and manufacturing equipment. The NBR compound offers excellent oil, hydrocarbon and grease resistance, making this ring a reliable choice for industrial sealing tasks across sectors. Its metric size caters to non-standard gland designs, enabling engineers to deploy a robust technical sealing component where custom dimensions are needed.

This O-ring fits installations requiring precise inner diameter (ID 290 mm) and cross-section (CS 5.3 mm), eliminating the risk of using ill-fitting seals and minimizing potential downtime. Its formulation supports both OEM production and maintenance of industrial installations focusing on sealing solutions for hydraulics and pneumatics.

Advantages

• Balanced hardness and flexibility (NBR 70 ShA): The 70 Shore A durometer provides optimal compliance under compression while retaining durability—ideal for seals that must compress reliably but resist extrusion and wear.

• Oil, grease and hydrocarbon resistance: NBR is widely cited as the most cost-effective sealing material for fluid power systems, owing to excellent compatibility with mineral oils and hydraulic fluids.

• Metric large-diameter format (290 x 5.3 mm): Non-standard size meets specialised applications in heavy-duty equipment, large actuators or custom machinery, offering a reliable pierścień uszczelniający for industrial B2B use.

• Uszczelnienie techniczne dla aplikacji przemysłowych: Suitable for hydraulic pistons, large bore cylinders, flange seals and industrial valves—this O-ring supports high uptime, minimal leakage and proven performance in demanding conditions.

• Local availability and fast logistics: Stored at our warehouse in Lublin, ul. Smoluchowskiego 1, building 4. 🚚 24 h delivery ensures critical spares for procurement, maintenance or service operations are ready when needed.

Technical Data

• Product type: O-Ring / industrial sealing ring

• Dimensions: Inner diameter (ID) 290 mm, Cross-section (CS) 5.3 mm

• Material: Nitrile Butadiene Rubber (NBR)

• Hardness: 70 Shore A

• Typical applications: Static or light dynamic sealing in hydraulics & pneumatics; industrial machines

• Temperature range (typical for NBR 70 ShA): approx. -30 °C to +120 °C depending on media & conditions

• Colour: Black

• Warehouse & Store: Lublin, ul. Smoluchowskiego 1, building 4

• Delivery: 24 h for B2B orders

FAQ

Q1: What does “70 ShA” mean for this O-Ring?
A: The “70 ShA” denotes the hardness of the rubber compound measured on the Shore A scale. A hardness of 70 ShA offers an effective balance between elasticity and structural rigidity—ensuring reliable sealing, especially in industrial applications where both compliance and mechanical resistance matter.

Q2: Is the NBR 70 material suitable for oil and grease environments?
A: Yes. Nitrile rubber (NBR) is acknowledged for its strong compatibility with mineral oils, hydraulic fluids and greases commonly used in hydraulic and pneumatic systems. It is often specified for fluid-power applications.

Q3: Can I use this O-Ring in dynamic applications with movement?
A: This version (290 x 5.3 mm NBR 70 ShA) is optimized for static sealing or applications with low relative motion. In heavy dynamic use (high speed, large reciprocation), you should verify design criteria carefully and consider alternative materials if necessary.

Q4: How do I ensure correct fit for this metric O-Ring?
A: Confirm that the gland or groove accommodates an inner diameter of 290 mm and cross-section of 5.3 mm. Check tolerances, material compression set and compatibility with media. Selecting correct size reduces leakage risk and improves life-cycle.

Q5: Is this product readily available for quick dispatch?
A: Yes. Stock is held at our warehouse in Lublin (ul. Smoluchowskiego 1, building 4) and we provide 24 h delivery for B2B customers—helping maintain uptime in critical industrial operations.