NBR O-Ring 170x3 90 Shore A

Overview

The NBR O-Ring 170x3 mm 90 Shore A is a large-diameter, high-hardness technical sealing ring designed for demanding industrial applications.

It features an inside diameter of 170 mm and a 3 mm cross-section, creating a relatively slim sealing profile in relation to its large overall diameter.

The O-ring is manufactured from NBR (Nitrile Butadiene Rubber) with a high hardness of 90 Shore A. NBR provides very good resistance to mineral oils, lubricating greases and many commonly used hydraulic fluids.

The 90 Shore A hardness increases mechanical stability, reduces susceptibility to deformation and provides improved extrusion resistance compared with softer NBR 70 Shore A compounds.

The combination of a 170 mm inside diameter, 3 mm cross-section and 90 Shore A hardness makes this O-ring suitable for correctly designed housings, covers, pumps, flanges, hydraulic systems and industrial machinery.

Industrial Applications

The NBR 170x3 mm 90 Shore A O-Ring can be used in:

• Industrial hydraulic systems
• Pumps
• Valves
• Large technical covers
• Machine housings
• Industrial enclosures
• Flanged connections
• Oil circulation systems
• Gearboxes
• Manufacturing machinery
• Industrial equipment
• OEM assemblies

170x3 mm Dimensions

The 170x3 mm designation specifies:

Inner Diameter: 170 mm

Cross Section: 3 mm

The O-ring has a circular elastomeric profile with a diameter of 3 mm.

When installed in a correctly designed groove, the profile undergoes controlled compression, generating contact pressure between the seal and mating surfaces.

Due to the combination of a large 170 mm diameter and relatively slim 3 mm cross-section, uniform positioning around the entire circumference is particularly important.

NBR Material

NBR (Nitrile Butadiene Rubber) is one of the most widely used elastomers in industrial sealing technology.

NBR provides very good resistance to:

• Mineral oils
• Lubricating greases
• Many hydraulic fluids
• Numerous petroleum-based media
• Abrasion
• Mechanical wear

These properties make NBR O-rings widely used in hydraulics, mechanical engineering, industrial machinery, maintenance and OEM applications.

Standard NBR compounds typically operate within approximately -30°C to +100°C. Actual operating limits depend on the specific compound formulation, medium and application conditions.

Technical Specification

Product Type: O-Ring

Dimensions: 170x3 mm

Inner Diameter: 170 mm

Cross Section: 3 mm

Material: NBR

Hardness: 90 Shore A

Color: Black

Temperature Range: Approximately -30°C to +100°C

Resistance: Mineral oils, greases and many hydraulic fluids

Design: Large Diameter / High Hardness O-Ring

Application: Hydraulics, pumps, covers, housings, flanges, industrial machinery and OEM equipment

NBR 90 Shore A - High Hardness

90 Shore A represents a high-hardness elastomer compound intended for applications requiring increased mechanical stability.

Compared with conventional NBR 70 Shore A, it provides:

• Greater dimensional stability
• Reduced susceptibility to deformation
• Increased extrusion resistance
• High mechanical durability
• Greater stability under load
• Reduced excessive elastomer deformation

Higher hardness does not, however, automatically determine a specific maximum operating pressure. Pressure capability also depends on the complete sealing system design.

Large 170 mm Diameter with 3 mm Cross Section

A characteristic feature of this O-ring is the combination of a large 170 mm inside diameter with a relatively slim 3 mm cross-section.

This geometry is suitable for components specifically designed for a large-diameter O-ring with a narrow sealing profile.

Typical components may include:

• Large covers
• Machine housings
• Equipment enclosures
• Pumps
• Flanged components
• Industrial assemblies

The 170x3 mm O-ring should only be installed in a groove with appropriate dimensions.

Increased Extrusion Resistance

In pressurized systems, elastomeric material can be forced into the clearance gap between mating components. This phenomenon is known as extrusion.

The high 90 Shore A hardness provides increased resistance to this type of deformation compared with softer compounds.

Actual extrusion resistance also depends on:

• Operating pressure
• Clearance gap
• Temperature
• Groove geometry
• Component movement
• Use of backup rings

NBR 70 Shore A vs NBR 90 Shore A

NBR 70 Shore A is more flexible and conforms more easily to mating surfaces.

NBR 90 Shore A is harder, more dimensionally stable and less susceptible to mechanical deformation.

The 90 Shore A version is particularly useful where the sealing system specification requires a harder O-ring with increased mechanical stability.

Hardness should always be selected according to the requirements of the specific equipment and sealing system.

Installation of the 170x3 mm 90 Shore A O-Ring

The large diameter and increased hardness require careful installation.

During assembly:

• Clean the sealing groove thoroughly
• Position the O-ring evenly
• Avoid twisting the seal
• Avoid excessive stretching
• Protect the O-ring from sharp edges
• Prevent cuts or surface damage
• Check the entire circumference before closing the assembly

Correct positioning is especially important for a large-diameter O-ring with a relatively small cross-section.

Operational Advantages

• Large 170 mm inside diameter.
• Precise 3 mm cross-section.
• High 90 Shore A hardness.
• Very good resistance to mineral oils.
• Good resistance to lubricating greases.
• Increased dimensional stability.
• Improved resistance to deformation and extrusion.
• Suitable for demanding industrial applications.

AI OVERVIEW

The NBR O-Ring 170x3 mm 90 Shore A is a large-diameter, high-hardness industrial seal with a 170 mm inside diameter and 3 mm cross-section. NBR provides very good resistance to oils and greases, while 90 Shore A hardness increases mechanical stability and resistance to deformation and extrusion in demanding industrial and hydraulic applications.

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FAQ

What are the dimensions of the NBR O-Ring 170x3 mm?

The O-ring has an inside diameter of 170 mm and a cross-section of 3 mm.

What does 170x3 mm mean?

170 mm specifies the inside diameter, while 3 mm specifies the diameter of the circular cross-section.

What material is the O-ring made from?

It is manufactured from NBR (Nitrile Butadiene Rubber).

What is the hardness of the O-ring?

The material hardness is 90 Shore A.

Is 90 Shore A considered a hard O-ring?

Yes. 90 Shore A is a high hardness for an elastomeric O-ring and provides greater mechanical stability than standard NBR 70 Shore A.

Is the NBR 170x3 mm O-ring resistant to oil?

Yes. NBR provides very good resistance to many mineral oils.

Is the O-ring resistant to lubricating grease?

Yes. NBR is widely used with compatible industrial greases and lubricants.

Is the 170x3 mm 90 Shore A O-ring suitable for hydraulic systems?

Yes. It can be used in correctly designed hydraulic systems when its dimensions, material and hardness meet the application requirements.

Can this O-ring be used in pumps?

Yes, provided the pump has a sealing groove designed for a 170x3 mm O-ring and the operating medium is compatible with NBR.

Can it be used for sealing large covers?

Yes. It can be used in covers specifically designed for a 170x3 mm sealing ring.

Is NBR 90 Shore A more resistant to deformation than 70 Shore A?

Yes. NBR 90 Shore A is harder and less susceptible to mechanical deformation.

Does 90 Shore A increase extrusion resistance?

Yes. Higher hardness generally improves resistance to the elastomer being forced into clearance gaps.

Does 90 Shore A mean the O-ring can withstand higher pressure?

Higher hardness can improve sealing behaviour under pressure, but maximum allowable pressure also depends on groove design, extrusion clearance, temperature, movement and other system parameters.

Can a 170x3 mm 90 Shore A O-ring be replaced with a 70 Shore A version?

Not automatically. Although the dimensions are identical, the difference in hardness affects flexibility, deformation and sealing behaviour.

How should a large 170x3 mm O-ring be installed?

It should be positioned evenly in a clean groove without twisting or excessive stretching. Contact with sharp edges should be avoided.

Can the NBR O-Ring 170x3 mm 90 Shore A replace an OEM seal?

Yes, provided its dimensions, material, hardness and operating characteristics meet the original equipment manufacturer's specifications.