O-Ring 121.4 x 3 mm NBR

Applications

The O-Ring 121.4 x 3 mm NBR 70 ShA is engineered for demanding industrial sealing tasks where precision and durability are paramount. With an inner diameter of 121.4 mm and a cross-section of 3 mm, this rubber gasket fits large-format housings, cylinders, pumps or valve bodies. Manufactured from nitrile butadiene rubber (NBR) with hardness 70 ShA, it offers excellent resistance to oils, greases and mechanical stress—making it a reliable choice for static, semi-dynamic or low-motion applications in hydraulic and pneumatic systems, as well as general industrial machinery. The inclusion of standardized NBR 70 material aligns the product with global searches for “NBR 70 Shore A O-ring”, “industrial sealing ring”, “rubber gasket oil resistant”, driving its visibility in procurement and engineering contexts.

Advantages

• High durability and oil-resistance - NBR material at 70 ShA hardness offers good mechanical stability and chemical resistance, including to mineral oils, lubricants and common industrial fluids.

• Optimized size 121.4x3 mm - The combination of a standard metric inner diameter and narrow cross-section makes this O-ring suited for compact grooves and assemblies requiring minimal clearance.

• Versatile sealing solution - Functions as a standard O-ring, technical sealing ring or rubber gasket in a wide variety of industrial and maintenance applications, enhancing spare-part uniformity in B2B procurement.

• Reduced downtime & simplified inventory - By opting for a commonly used size and material, you streamline replacement processes and benefit from faster service operations and lower stocking complexity.

• Targeted for industrial sealing needs - Keywords such as “O-ring 121.4 x 3 mm”, “NBR 70 Shore A seal”, “industrial rubber gasket”, “technical sealing component” reflect actual search behavior and enhance SEO strength for engineers and maintenance teams.

Technical Data

• Type: O-Ring / rubber gasket / technical sealing ring

• Dimensions: Inner Diameter (ID) = 121.4 mm | Cross-Section (CS) = 3 mm

• Material: NBR (Nitrile Butadiene Rubber)

• Hardness: 70 ShA

• Typical uses: hydraulic cylinders, pneumatic actuators, machine housings, pump or valve flanges, industrial gearboxes

• Key search terms: O-Ring 121.4x3 mm, rubber gasket NBR 70, industrial sealing ring, high-durability O-ring, technical seal oil resistant
  Material NBR 70 is frequently cited in specification sheets for high durability, resistance to many lubricants, and general-purpose sealing in hydraulics and pneumatics.

FAQ

Q1: Why choose NBR at 70 ShA for this O-Ring?
A1: NBR (nitrile rubber) with hardness 70 ShA offers an optimal balance of elasticity and mechanical strength, making it suitable for sealing applications exposed to oils, greases and standard industrial fluids.

Q2: What types of equipment require an O-Ring 121.4x3 mm?
A2: This size is commonly used in larger assemblies such as hydraulic or pneumatic cylinders, machine housings, pump covers or valve bodies where a 121.4 mm inner diameter and thin 3 mm cross-section are required.

Q3: Can this O-Ring handle oil-rich environments?
A3: Yes—thanks to its NBR 70 formulation, it is designed to resist mineral oils, lubricants and other typical industrial fluids, making it ideal for hydraulic and pneumatic systems.

Q4: How to verify that 121.4x3 mm is the correct size?
A4: Confirm the required inner diameter (ID = 121.4 mm) and the cross-section thickness (CS = 3 mm), and ensure that the material (NBR 70 ShA) matches the environment (oil, grease, temperature). If all align, this O-Ring is a suitable replacement.

Q5: Is this product practical for B2B procurement and maintenance?
A5: Yes—its standardized dimension and material make it a smart choice for service departments, machine builders and industrial procurement teams looking for a reliable rubber gasket with high repeatability and ease of stocking.