O-Ring 191x3 mm NBR

Applications

The O-Ring 191x3 mm NBR 70 Shore is engineered for demanding industrial sealing roles where a large-diameter rubber gasket is essential. With an inner diameter of 191 mm and cross-section of 3 mm, this O-Ring is ideal for pump housings, bearing units, hydraulic cylinders, pneumatic actuators and other assembly points requiring robust sealing. The material—nitrile-butadiene rubber (NBR) with hardness 70 Shore A—ensures reliable performance in industrial sealing, hydraulic and pneumatic applications.

Technical Advantages

• High chemical and oil resistance - NBR compound offers strong durability against mineral oils, greases, hydraulic fluids and many hydrocarbons.

• Large inner diameter format - 191 mm ID enables seamless integration into large-bore systems and reduces the need for multiple smaller seals.

• Optimised hardness for static and light-dynamic use - At 70 Shore A the seal offers excellent resilience, minimal set and long-term reliability.

• Streamlined procurement for B2B users - A standardised part that supports inventory control, fast replacements and reduced downtime.

Technical Data & Specification Summary

• Material: Nitrile Rubber (NBR)

• Hardness: 70 Shore A

• Inner Diameter (ID): 191 mm

• Cross-Section (CS): 3 mm

• Typical temperature range: approx. -30 °C to +100 °C (short-term up to +120 °C)

• Compatible media: Mineral oils, greases, aliphatic hydrocarbons, some hydraulic fluids

• Ideal uses: Large-scale mechanical systems, bearing housings, hydraulic/pneumatic assemblies

• Format advantage: Large ID single ring simplifies logistics, reduces SKU count and supports B2B efficiency

Why choose this O-Ring?

This large-format O-Ring delivers a combination of high chemical resistance, broad industrial usability and large bore compatibility. Ideal for maintenance, OEM and machine building sectors, it supports streamlined supply chains and fast service turnaround.

FAQ

Q1: What exactly does “191x3 mm” signify?
A1: It indicates an O-Ring with an inner diameter of 191 mm and a cross-section (thickness) of 3 mm — suitable for sealing large-bore components.
Q2: Why is NBR 70 Shore used for this product?
A2: The NBR material with 70 Shore A hardness gives a balanced performance—good oil, grease and hydrocarbon resistance with sufficient elasticity for static and light dynamic sealing.
Q3: Is this O-Ring suitable for hydraulic systems?
A3: Yes — its size and material specification make it ideal for hydraulic cylinders, pumps, bearing housings and other industrial sealing applications.
Q4: What are the benefits for procurement departments?
A4: The standard large-ID format reduces part variety, simplifies stock management, supports faster replacements, and lowers downtime for industrial operations.
Q5: Are there any limitations on temperature or media?
A5: While suitable for many oils and greases within -30 °C to +100 °C (short-term +120 °C), it is not designed for prolonged exposure to ozone, high-aromatic fuels or extremely high temperatures.