O-Ring 121x3 mm NBR

Applications

The O-Ring 121x3 mm NBR 70 ShA is designed for precision industrial sealing and maintenance operations. With an inner diameter of 121 mm and a cross-section (CS) of 3 mm, this rubber gasket fits into a wide range of equipment: hydraulic cylinders, pneumatic actuators, gearboxes, pump housings and large-format mechanical assemblies. Crafted from nitrile butadiene rubber (NBR) at hardness 70 ShA, the ring provides dependable sealing in environments exposed to oils, greases and moderate mechanical motion. This dimension and material compound align with widely searched technical terms such as “O-Ring 121x3 mm”, “NBR 70 Shore A seal”, “industrial sealing ring” and “rubber gasket oil resistant”.

Advantages

• High durability and oil resistance - The NBR 70 ShA compound ensures stable performance, excellent chemical resistance and long service life in oil-rich and grease-contaminated environments.

• Optimised size 121x3 mm - Matching common groove dimensions and industrial standards, this size enhances replaceability and inventory standardisation.

• Versatile sealing solution - Acts as an O-Ring, rubber gasket, or technical sealing ring. Suitable for static sealing, slight motion, and hydraulic/pneumatic applications.

• Supply chain efficiency - Standardising on this dimension and material reduces SKU proliferation, simplifies maintenance logistics and improves time to repair.

• Industrial-grade readiness - Keywords such as “uszczelka gumowa”, “uszczelnienie techniczne”, “aplikacje przemysłowe” reflect the search intent of B2B procurement specialists and engineers.

Technical Data

• Type: O-Ring / Rubber gasket / Sealing ring

• Material: NBR (nitrile butadiene rubber)

• Hardness: 70 ShA

• Dimensions: Inner diameter (ID) = 121 mm | Cross-section (CS) = 3 mm

• Typical applications: Hydraulic seals, pneumatic equipment, machine housings, pump and valve assemblies

• Common search terms: O-Ring 121x3 mm, NBR 70 Shore A, industrial sealing ring, rubber gasket oil resistant, technical seal
  NBR material at 70 ShA provides reliable performance across a typical service temperature from approximately -30 °C to +100-120 °C and is compatible with many mineral oils and lubricants.

FAQ

Q1: Why is NBR 70 ShA used for industrial O-Rings?
A1: NBR rubber with hardness 70 ShA offers a balance of elasticity and resistance. It withstands exposure to oils, greases and standard industrial fluids, making it a trusted material for sealing applications.

Q2: In what applications is a 121x3 mm O-Ring commonly used?
A2: This size is common in large mechanical assemblies like hydraulic cylinders, machine housings, pump covers and pneumatic modules where a robust rubber seal is required for an internal diameter around 121 mm with minimal cross-section.

Q3: Can this O-Ring be used in contact with oils and greases?
A3: Yes. The NBR 70 ShA compound is specifically chosen for its high resistance to mineral oils, lubricants and typical conditions found in industrial hydraulic and pneumatic systems.

Q4: How should I choose the correct O-Ring size?
A4: Verify the inner diameter (ID), cross-section (CS) and material hardness. For applications requiring an O-Ring with 121 mm ID and 3 mm cross-section in an oil-exposed environment, select the 121x3 mm NBR 70 ShA model.

Q5: Is this product suitable for B2B procurement and maintenance stocking?
A5: Absolutely. Its standardized dimension and material make it ideal for service departments, industrial supply chains and maintenance inventories, reducing downtime and simplifying component management.