6.99mm CS HNBR O-Rings

Product Overview

6.99mm CS HNBR O-Rings are precision sealing rings manufactured from hydrogenated nitrile rubber (HNBR), offering excellent resistance to high temperatures, oils, fuels, ozone, and aging. Designed with a fixed 6.99mm cross section (CS), these O-Rings provide a reliable sealing solution for applications requiring accurate dimensions, good compression performance, and long-term durability.

Compared with standard NBR O-Rings, HNBR provides improved heat resistance, mechanical strength, and aging performance. The 6.99mm cross section is widely used in compact mechanical assemblies, automotive systems, hydraulic and pneumatic equipment, fuel systems, refrigeration equipment, and industrial sealing applications.

Key Features

• 6.99mm Cross Section Design – Provides a balance between compact installation and reliable sealing performance
• High Temperature Performance – Maintains sealing reliability in elevated temperature environments
• Excellent Oil & Fuel Resistance – Suitable for petroleum-based oils, fuels, lubricants, and hydraulic fluids
• Enhanced Aging & Ozone Resistance – Helps extend service life in demanding operating conditions
• Precision Molded Construction – Ensures consistent dimensions and dependable sealing performance

Specifications

• Material: HNBR (Hydrogenated Nitrile Rubber)
• Cross Section (CS): 6.99mm
• Inside Diameter (ID): Available in multiple sizes
• Hardness: 70A (Other hardness options available)
• Color: Black (Custom colors available)
• Temperature Range: Approx. -40°C to +150°C (depending on compound and application)
• Size Format: ID × CS

Applications

• Automotive sealing systems
• Hydraulic and pneumatic equipment
• Fuel and oil systems
• Refrigeration and air conditioning equipment
• Industrial machinery
• Precision mechanical components

Custom HNBR O-Ring Solutions

We supply 6.99mm CS HNBR O-Rings in various inside diameter (ID) sizes with options for different hardness grades, dimensions, and custom compounds to meet specific sealing requirements.