O-Ring 238x4 NBR

Product Overview & Technical Features

The O‑Ring 238x4 NBR 70 Shore is a premium industrial sealing component designed for demanding hydraulic and pneumatic applications. With an inner diameter (ID) of 238 mm and a cross-section (CS) of 4 mm, this rubber seal (or gasket) is engineered using nitrile rubber (NBR) compound with a hardness of 70 Shore A. The material selection ensures excellent oil and fuel resistance, making it ideal as a static seal or lightly dynamic sealing ring in production lines, industrial equipment and fluid power systems.

NBR at 70 Shore A strikes the optimal balance between elasticity and mechanical strength, enabling reliable performance in oily, greased or hydraulic fluid environments. According to published data, NBR 70 Shore A O-rings are suitable for oil, grease and fuel exposure, with typical temperature resistance from approximately -30 °C to +120 °C (some sources list up to +135 °C for short-term use).
This product is therefore especially suitable for industrial sealing applications where downtime is unacceptable and performance must be consistent.

📍 Warehouse & Store: Lublin, ul. Smoluchowskiego 1, building 4
🚚 24h Delivery - fast order fulfilment

Applications & Commercial Advantages

This industrial sealing ring finds application across a wide spectrum of sectors. Use cases include fluid-power systems (hydraulic cylinders, valves, pump housings), pneumatic equipment, general industrial machinery and equipment requiring an O-ring of large diameter. The dimension 238x4 mm is less common in small parts catalogs, making availability a key asset for B2B procurement.
Key benefits:

• Immediate availability of a large-diameter O-ring reduces lead times and supports maintenance & repair operations.

• Material NBR 70 Shore A provides high durability and the “rubber gasket” can withstand exposure to mineral oils and hydraulic fluids, reducing service intervals and total cost of ownership.

• The product is well suited for industrial sealing, offering consistent performance in demanding applications, making it a reliable component for procurement managers sourcing “industrial sealing”, “rubber gasket”, “O-ring 238x4” etc.

• Fast dispatch from our warehouse in Lublin enhances logistic efficiency and strengthens supply chain reliability for distributors and end-users.

Technical Specification & Performance Parameters

• Internal diameter (ID): 238 mm

• Cross-section (CS): 4 mm

• Material: NBR (nitrile rubber)

• Hardness: 70 Shore A

• Approximate operating temperature range: -30 °C to +120 °C (dependent on media and pressure)

• Typical colour: black

• Recommended application: static or mildly dynamic sealing in hydraulic/pneumatic systems, industrial machinery

• Logistical highlight: stocked in Lublin (ul. Smoluchowskiego 1, building 4) with 24 h dispatch availability

FAQ

Q1: What does “238x4 NBR 70 Shore” mean in the context of this O-ring?
A1: It refers to a sealing ring with an internal diameter of 238 mm, cross-sectional thickness (cord size) of 4 mm, manufactured from nitrile rubber (NBR) with hardness of 70 Shore A. These parameters are critical for fitting correctly and achieving sealing performance in industrial equipment.

Q2: Is this O-ring suitable for dynamic applications?
A2: Yes, this O-ring is suitable for static sealing and lightly dynamic applications (e.g., cylinders with moderate movement). For highly dynamic motion or extreme conditions (high speed, large amplitude, high temperature) a specialized sealing solution may be required.

Q3: What media and environmental conditions can this O-ring handle?
A3: The NBR material provides excellent resistance to mineral oils, hydraulic fluids and greases, making it suitable for industrial hydraulics and pneumatics. However, exposure to ozone, UV or aggressive chemical compounds (e.g., ketones, strong acids) may degrade performance; for those conditions alternative materials should be considered.

Q4: What is the typical temperature range for this O-ring?
A4: The typical operating range for an NBR 70 Shore A O-ring is approximately -30 °C to +120 °C under typical industrial conditions. For short-term peaks higher, but long-term durability is best within this range.

Q5: How quickly can this product be supplied and from where?
A5: The product is stocked at our facility in Lublin (ul. Smoluchowskiego 1, building 4) and can be dispatched within 24 h — enabling rapid procurement cycles and minimizing downtime in industrial operations.