O‑Ring 20x2,5 NBR

Applications and Technical Features of the O-Ring 20x2.5 NBR 70 ShA (100pcs.)

This O-ring with internal diameter of 20 mm and cross-section 2.5 mm, made of NBR (nitrile rubber) at 70 ShA hardness, serves as a robust rubber gasket or sealing ring ideal for a wide range of industrial sealing, hydraulic and pneumatic uses. With excellent resistance to oils and greases, it finds application in pumps, valves, cylinder assemblies, fluid power units, bearing housings and static or lightly dynamic sealing zones. This pack of 100 pieces provides a cost-effective supply for maintenance teams, production lines and B2B buyers who require consistent performance of sealing components in demanding environments.

Advantages

• Material NBR, hardness 70 ShA: The nitrile rubber formulation offers strong resistance to petroleum oils, hydraulic fluids and greases, making it suitable for industrial environments with lubrication and sealing demands.

• Exact dimension 20x2,5 mm: Ensures quick and straightforward installation in standard grooves without redesign, supporting efficient maintenance and reduced downtime.

• Bulk quantity (100 pieces): Designed for B2B procurement, this pack ensures cost-effective stocking, standardization of spares and streamlined service operations.

• Versatile usage: Effective in both static seals (e.g., flange joints, sensor housings) and mild dynamic sealing (e.g., pistons, rods) thanks to the reliable O-ring geometry and material properties.

• Enables high durability: The combination of correct material, dimension and bulk availability supports long service intervals, fewer shutdowns and reduced maintenance costs.

Technical Data

• Product type: O-ring / sealing ring

• Dimensions: Inner diameter (ID) = 20 mm · Cross-section (CS) = 2.5 mm

• Hardness: 70 ShA

• Material: NBR (nitrile butadiene rubber)

• Pack size: 100 pieces

• Typical applications: industrial sealing, hydraulic and pneumatic systems, bearing housings, fluid power units

• Keywords: O-ring, rubber gasket, industrial sealing ring, sealing component, technical sealing

Main Description

The O-Ring 20x2,5 mm NBR 70 ShA (Pack of 100) offers a high-quality, production-ready sealing solution for engineering environments where reliability and economy matter. Constructed from nitrile butadiene rubber with a hardness rating of 70 ShA, it is optimized for sealing interfaces exposed to oils, greases and lubricants, making it an ideal choice across hydraulic, pneumatic and general industrial applications.

In many systems, proper selection of a sealing ring ensures machine reliability, reduces downtime and minimizes leak-related issues. The dimensional accuracy (20 mm ID x 2.5 mm CS) conforms to commonly specified grooves in bearing housings, pump assemblies or valve bodies, facilitating rapid maintenance or retrofit without manufacturing changes. The bulk pack of 100 pieces delivers value by enabling standardized stocking, predictable replacement operations and consistent quality across multiple service points.

Engineers and procurement teams will appreciate the balance between functional performance and cost-efficiency. This O-ring functions as a static seal in fixed joint applications or as a dynamic sealing element in moderate motion settings. Its excellent compatibility with oil-based media and mechanical durability ensures it meets expectations for “high durability” sealing components in professional environments.

Designed for B2B purchasing, this pack supports continuity of operations, enabling maintenance departments to respond quickly and keep production running. When specifying a reusable, proven rubber gasket or sealing ring for industrial use, this O-ring stands out for material integrity, accurate dimensions and legacy availability.

FAQ

Q1: What material is this O-ring made from and why?
A1: The material is NBR (nitrile butadiene rubber) at 70 ShA hardness. NBR is selected for its strong resistance to oils, greases and petroleum-based fluids, making it suitable for industrial sealing.

Q2: Can this O-ring be used in both static and dynamic applications?
A2: Yes - while particularly effective for static sealing (interfaces, flanges), it can also be used in mild dynamic applications (e.g., small piston motion) thanks to the standard O-ring geometry and suitable elastomer.

Q3: Why choose a pack of 100 pieces?
A3: Bulk packaging ensures cost-effective stocking, easy replacement across multiple machines or lines, standardized inventory and less downtime. It supports maintenance strategies where many identical seals are used.

Q4: How does one ensure correct sizing for the O-ring?
A4: Measure the shaft or bore diameter (20 mm here) and check the cross-section (2.5 mm). The groove should accommodate the CS size and material hardness; using correct specification ensures seal integrity and longevity.

Q5: What are typical applications for this O-ring size and material?
A5: It is frequently used in industrial pumps, valves, bearing housing covers, hydraulic and pneumatic cylinders, general machine frames and other systems requiring reliable sealing against oil, grease and moderate pressure environments.