O-Ring 2.9x1.78 NBR

Applications in Hydraulic, Pneumatic and Industrial Systems

The O-Ring 2.9x1.78 NBR 70 ShA is a compact, precision-made rubber seal designed for professional industrial use. It provides reliable static sealing in hydraulic and pneumatic systems, pumps, valves, fittings, automation components and various industrial machines. Thanks to its small size, it fits perfectly into tight installation spaces, micro-valves, compact connectors and precision-machined housings where consistent sealing is essential.

Key Advantages and Material Features

Manufactured from NBR 70 ShA (nitrile rubber), the O-Ring offers excellent resistance to mineral oils, greases, fuels and most hydraulic media. Its elastomer structure ensures dimensional stability, low compression set and long-term durability, even under continuous pressure or frequent assembly cycles. The consistent quality of the sealing ring improves system reliability and reduces the risk of leakage in demanding industrial sealing applications. Bulk packaging of 1000 pieces optimizes stock levels for maintenance teams, production plants and industrial distributors.

Technical Specification

• Material: NBR (Nitrile Rubber), 70 ShA

• Dimensions: ID 2.90 mm, CS 1.78 mm

• Type: O-Ring / rubber gasket / static industrial seal

• Media compatibility: oil, grease, fuel, hydraulic fluids

• Typical temperature range: approx. -30°C to +100°C

• Packaging: 1000 pcs (industrial bulk pack)

• Applications: hydraulics, pneumatics, pumps, valves, fittings, industrial machinery

Main Description

The O-Ring 2.9x1.78 NBR 70 ShA is a high-performance industrial sealing component designed for universal use in mechanical engineering, maintenance departments, service workshops and OEM production. Made from durable nitrile rubber, the seal demonstrates excellent resistance to hydraulic oils, lubricants, fuels and many commonly used industrial fluids. Its compact geometry (2.9 mm inner diameter and 1.78 mm cross-section) ensures a tight, reliable fit in small housings and precision components where minimal dimensional tolerance and stable compression are required.

Thanks to its 70 ShA hardness, this rubber gasket maintains optimal elasticity, mechanical stability and sealing force across a wide spectrum of working conditions. It is ideally suited for static sealing, such as in threaded connections, pump housings, hydraulic blocks, fittings, valves and pneumatic systems. The low compression set of NBR significantly increases service life, reducing the frequency of replacements and the downtime of industrial equipment.

The bulk packaging of 1000 pieces is ideal for B2B customers who need consistent supply and cost-effective stock management. Maintenance teams, industrial plants, workshops and distributors benefit from long-term availability and fast installation during repair cycles. With its proven durability and resistance, the O-Ring 2.9x1.78 NBR 70 ShA is an essential component for hydraulic, pneumatic and mechanical applications, delivering stable sealing performance in demanding industrial environments.

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FAQ - Common Technical Questions

1. What is the O-Ring 2.9x1.78 NBR 70 ShA used for?
It is used for static sealing in hydraulic, pneumatic, pump and industrial machinery components requiring small-dimension seals.

2. Is NBR 70 ShA resistant to oils and fuels?
Yes. NBR provides excellent resistance to oils, lubricants, fuels and most hydraulic media.

3. What is the operating temperature range?
Typical working range is approximately -30°C to +100°C, depending on the application.

4. Is the 1000-piece package suitable for industrial use?
Yes. Bulk packaging is ideal for stock management, maintenance operations and production environments.

5. Can this O-Ring be used in dynamic sealing?
It is designed primarily for static sealing; for dynamic or high-speed movement, use seals intended for dynamic applications.