Recommended Applications - Industrial, Hydraulic & Pneumatic Systems

The 2.9x1.9 NBR 70ShA O-Ring serves as a compact and reliable rubber sealing ring ideal for industrial sealing systems, especially in hydraulic, pneumatic and mechanical assemblies. It is widely used in static sealing of valves, pipe fittings, pumps, hydraulic cylinders, pneumatic actuators, control units and various industrial devices that require a small but durable sealing element. Its dimensions make it particularly suitable for precision assemblies, compact components and small-diameter housings.

Advantages and Material Properties

Crafted from Nitrile Butadiene Rubber (NBR) with a hardness of 70 ShA, this O-Ring exhibits strong resistance to oils, greases, fuels and hydraulic fluids, along with stable elasticity and minimal compression set. These properties ensure long-term sealing performance even under repeated pressure cycles. The rubber’s flexibility and resilience help maintain tight sealing without cracking or deformation, making it a dependable technical seal across a range of working conditions.

Technical Specifications

• Inner Diameter (ID): 2.9 mm

• Cross-Section (CS): 1.9 mm

• Material: NBR (industrial-grade nitrile rubber)

• Hardness: 70 ShA

• Temperature Range: approx. -30 °C to +100 °C (standard NBR rating)

• Chemical Compatibility: mineral oils, lubricants, fuels, hydraulic fluids, light greases

• Pack Size: 100 pieces per pack

• Usage Type: static seals, light-duty pneumatic/hydraulic applications, small fittings

Product Description

The O-Ring 2.9x1.9 NBR 70ShA is designed for industrial environments that demand a compact, precise, and reliable sealing element. Its small size and consistent manufacturing tolerances allow it to be used in confined spaces, narrow grooves, precision valves, hydraulic couplings, pneumatic fittings, instrumentation devices, and other assemblies where leak prevention is critical.

Thanks to the high-quality NBR rubber compound, this O-Ring offers excellent resistance to oils, greases, hydraulic fluids and light fuels, while maintaining elasticity and sealing integrity under pressure. The hardness profile (70 ShA) ensures balanced stiffness and flexibility — preventing deformation during installation and operation while avoiding leaks even after long service periods.

Supplied in packs of 100 pieces, the product is well-suited for B2B customers: service departments, maintenance teams, machine builders, OEMs, and workshops that require a steady supply of sealing components. Bulk packaging reduces cost per item, simplifies inventory management and ensures readiness for routine maintenance or large-scale assembly projects.

When you need a reliable rubber gasket for static or light-dynamic sealing applications — from hydraulic valves to pneumatic couplers — this O-Ring delivers durable performance, chemical resistance and precise fitment, contributing to system reliability and minimizing downtime.

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FAQ - Frequently Asked Questions

Q1: What applications suit the 2.9x1.9 NBR O-Ring?
Ideal for sealing valves, fittings, pumps, hydraulic or pneumatic couplings, small gearboxes and other compact devices requiring static or light-duty seals.

Q2: Is NBR 70ShA resistant to oils and hydraulic fluids?
Yes. NBR 70ShA offers strong resistance to mineral oils, lubricants, light fuels, greases and many hydraulic fluids. It retains elasticity and sealing performance within standard temperature ranges.

Q3: What temperature range can this O-Ring handle?
Typically from about -30 °C to +100 °C under normal conditions. For special high-temperature or aggressive chemical environments, alternative materials should be considered.

Q4: Is this O-Ring suitable for dynamic (moving) shafts or high-speed applications?
This O-Ring is best for static seals or light-duty pneumatic/hydraulic motions. For rotary shafts or high-speed dynamic seals, dedicated shaft seals are recommended.

Q5: What advantages come from bulk packaging (100 pcs)?
Bulk packaging lowers the unit cost, simplifies stock management, ensures consistent availability and supports efficient maintenance or production workflows.