O-ring 121x5 NBR 90 ShA - High-Performance Sealing Ring

Technical Specifications & Applications of O-ring 121x5 NBR 90 ShA

O-ring 121x5 NBR 90 ShA is a robust sealing ring with inner diameter 121 mm and cross section (thickness) 5 mm. Made of nitrile rubber (NBR) at a hardness of 90 Shore A, this O-ring is engineered for demanding industrial environments where pressure, oil resistance, and mechanical stability matter.

Key Features & Advantages

• Material: NBR (nitrile rubber) — excellent resistance to oils, greases, fuels, and many common hydraulic fluids.

• Hardness 90 Shore A — high stiffness and reduced deformation under pressure, ideal when rigidity and strength outweigh flexibility.

• Dimension: 121x5 mm — precise sizing ensures tight sealing in matching grooves and applications.

• Temperature range & stability — typical service from about -30 °C to +100 °C (depending on compound formulation) (standard NBR 90 O-rings are used in such ranges).

• High pressure performance — suitable for static sealing under considerable pressure; in dynamic or high-pressure systems, use back-up rings or anti-extrusion supports.

• Chemical resistance — good compatibility with mineral oils, petroleum-based fluids, many lubricants; limited resistance to ozone, UV, strong acids/alkaline solvents.

• Mechanical durability — enhanced wear and fatigue resistance due to higher hardness, lower deformation, and dimensional stability.

Applications & Use Cases

This O-ring is ideal for many industrial sealing tasks: hydraulic cylinders, valves, piston seals, pump housings, fittings, gearboxes, fluid control systems, and other assemblies where a robust seal is required. Use in static or moderately dynamic conditions, ensuring groove design and extrusion protection are considered.

Installation & Operational Guidelines

• The sealing groove (O-ring groove) must be designed with correct clearances, fillet radii, and tolerances to avoid over-stress.

• In high-pressure or dynamic systems, include backup rings (back-up rings) or anti-extrusion devices to prevent the O-ring from extruding under load.

• Use a compatible lubricant during installation (e.g. silicone grease or other NBR-safe lubricant) to ease assembly and reduce wear.

• Avoid exposing the O-ring to strong ozone, UV light, or harmful solvents that degrade NBR elastomers.

• Inspect periodically under load cycles; higher hardness reduces deformation, but wear over time still may occur.

Summary

O-ring 121x5 NBR 90 ShA is a premium sealing ring sized 121x5 mm with a stiff 90 Shore A nitrile construction, delivering excellent resistance to oils, pressure, and mechanical stress. It is ideal for demanding hydraulic, pneumatic, and industrial systems where stability and durability are crucial. With stock based in Lublin and 24h shipping, it’s ready for fast deployment in B2B applications.

📍 Warehouse & Store: Lublin, ul. Smoluchowskiego 1, building 4
🚚 24h shipping - fast and efficient order processing

FAQ (Frequently Asked Questions)

Q1: What does “NBR 90 ShA” mean?
It stands for nitrile rubber (NBR) material with 90 Shore A hardness — a stiff elastomer suited to resisting deformation and handling heavy-duty sealing tasks.

Q2: Can this O-ring be used in dynamic (moving) seals?
Yes, but in high-pressure or reciprocating motion environments, it's recommended to use backup rings to protect against extrusion and premature failure.

Q3: What is the typical temperature range?
Standard NBR 90 O-rings operate safely from approximately -30 °C to +100 °C, depending on compound formulation and environmental factors.

Q4: What fluids is it compatible with?
It is well-suited for mineral oils, fuels, greases, and many hydraulic fluids. However, it has limited resistance to aggressive chemicals, ozone, UV, strong acids, or alkaline solvents.

Q5: How quickly can I get this product?
The product is stored in Lublin. We offer 24h shipping - fast and efficient order processing for B2B customers globally (subject to logistics conditions).