O RING 21 x 2,5 NBR 70

O-ring 21 × 2.5 NBR 70 is a universal rubber sealing ring made of nitrile rubber (NBR) with a hardness of approximately 70 Shore A.

NBR material is among the most widely used materials for O-ring production due to its good mechanical strength and very good resistance to mineral oils, lubricants and a range of common operating fluids.

The size 21 × 2.5 mm indicates an internal diameter (d1) of 21 mm and a cross-section diameter (d2) of 2.5 mm.

The ring is also suitable for common plumbing and maintenance work, such as repairs to fittings, valves, pumps and other equipment where the required seal dimension and material are appropriate.

NBR is a universal choice for hydraulics, pneumatics, mechanical engineering and general technical applications. For high temperatures, aggressive chemicals or specific applications, it is necessary to choose an appropriate material, such as FKM, EPDM or VMQ.

Technical Parameters:
Type: O-ring
Size: 21 × 2.5 mm
Internal Diameter (d1): 21 mm
Cross-section Diameter (d2): 2.5 mm
Material: NBR – nitrile rubber
Hardness: 70 Shore A
Colour: black
Temperature Range: approximately −30 °C to +100 °C
Resistance: mineral oils, lubricants, water, air and common technical media

Applications:
Plumbing work, water fittings, valves, pumps, pneumatic systems, hydraulics, machinery and equipment, maintenance work and general industrial sealing.