O-ring NBR 66x3,5 mm

Oring NBR 66x3.5 mm 70 Shore Technical Seal

Oring NBR 66x3.5 mm 70 Shore is an industrial nitrile rubber sealing ring designed to provide reliable fluid sealing in hydraulic equipment, pneumatic systems and mechanical assemblies operating with oils and technical fluids.

Within the category of technical seals NBR O-rings, this dimensional configuration is frequently used in medium diameter sealing grooves where a thicker elastomer cross section ensures stable compression and long service life. NBR nitrile rubber is widely recognized in industrial sealing technology due to its strong resistance to mineral oils, greases and hydraulic fluids commonly used in machinery.

The Oring 66x3.5 mm is commonly searched by engineers and maintenance technicians using dimensional queries such as oring 66x3.5, NBR oring 66 mm, rubber sealing ring 66x3.5 mm, or nitrile O-ring 3.5 mm cross section. These dimensional search patterns often appear when replacing worn seals in pumps, valve housings or mechanical covers.

With a hardness of 70 ShA, the nitrile rubber compound offers balanced elasticity and resistance to deformation under pressure. This allows the Oring to compress correctly in sealing grooves, forming an effective barrier against leakage of oils or hydraulic fluids while maintaining durability during long term operation.

In industrial maintenance and machine construction, NBR O-rings are widely selected because they combine reliable sealing performance with cost efficiency and easy availability for spare parts supply chains.

Industrial Applications

Technical seals from the NBR O-rings category are widely used in many industrial sectors where oil resistant elastomer seals are required.

Common applications include:

hydraulic cylinders and valves
industrial pumps and compressors
gearbox lubrication systems
machine covers and housing seals
agricultural machinery hydraulic systems
fluid distribution blocks in industrial automation

In these systems the Oring NBR 66x3.5 mm typically functions as a static seal preventing leakage of oils or lubricants between mechanical components.

Dimensional Compatibility

Accurate dimensions are essential for proper sealing performance in industrial equipment.

The Oring 66x3.5 mm corresponds to the following dimensional parameters:

Inner diameter: 66 mm
Cross section thickness: 3.5 mm
Outer diameter: 73 mm

This dimensional format is commonly used in standard sealing grooves designed for medium size nitrile rubber seals in pumps, valve bodies and machine housings.

Typical dimensional search phrases include:

NBR oring 66x3.5 mm
rubber sealing ring 66 mm
industrial nitrile O-ring 66 mm ID
oring 3.5 mm cross section seal

Construction and Material

The sealing ring is manufactured from NBR nitrile rubber, an elastomer specifically developed for sealing applications exposed to oils, lubricants and fuels.

Key properties of nitrile rubber include:

excellent resistance to mineral oils
good compatibility with hydraulic fluids
high elasticity for compression sealing
good mechanical durability in industrial environments

The circular cross section of the Oring allows uniform deformation inside the sealing groove. Once compressed between sealing surfaces the ring creates a pressure assisted sealing interface preventing fluid leakage.

Because of these characteristics NBR O-rings are widely used in industrial maintenance, machine manufacturing and fluid control systems.

Operational Advantages

Engineers and maintenance technicians often choose NBR O-rings due to their reliable performance and versatility.

Main advantages include:

excellent resistance to oils and lubricants
stable sealing performance under pressure
good compression recovery
long service life in industrial machinery
cost efficient sealing solution for maintenance operations

These features make nitrile rubber sealing rings a standard component in industrial sealing technology.

Technical Specification

Type: elastomer sealing ring Oring
Material: NBR nitrile rubber
Hardness: 70 ShA
Inner diameter: 66 mm
Cross section: 3.5 mm
Outer diameter: 73 mm
Color: black
Temperature range: approx -30 C to +100 C
Application: hydraulic pneumatic industrial sealing

FAQ

What equipment uses Oring NBR 66x3.5 mm
This size is commonly used in hydraulic valves, pump housings, industrial machine covers and lubrication system components.

Is NBR suitable for oil sealing applications
Yes. NBR nitrile rubber is specifically designed for environments exposed to mineral oils, lubricants and hydraulic fluids.

Can this O-ring be used in hydraulic systems
Yes. NBR O-rings are one of the most commonly used sealing elements in hydraulic equipment.

What does 70 ShA hardness indicate
70 ShA indicates medium hardness elastomer that provides a balance between flexibility and resistance to deformation during compression sealing.