NBR O-Ring 170x3 mm 70 Shore A

Overview

The NBR O-Ring 170x3 mm 70 Shore A is a large-diameter technical sealing ring featuring an inside diameter of 170 mm and a 3 mm cross-section.

It is designed for correctly engineered sealing connections in machine covers, housings, pumps, hydraulic equipment and other industrial components.

Manufactured from NBR (Nitrile Butadiene Rubber) with a hardness of 70 Shore A, the O-ring provides a practical combination of flexibility, elastic recovery and mechanical durability.

NBR offers very good resistance to mineral oils, lubricating greases and many commonly used hydraulic fluids. The 70 Shore A compound conforms more easily to mating surfaces than harder NBR variants, making it a versatile choice for many industrial sealing applications.

The combination of a large 170 mm inside diameter and relatively slim 3 mm cross-section makes this O-ring suitable for components specifically designed for this sealing geometry.

Industrial Applications

The NBR 170x3 mm 70 Shore A O-Ring can be used in:

• Technical covers
• Machine housings
• Industrial enclosures
• Pumps
• Hydraulic systems
• Valves
• 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. This creates contact pressure between the elastomer and mating surfaces, helping to prevent leakage.

Because of the large diameter combined with the relatively small cross-section, even positioning around the entire circumference is particularly important.

NBR Material

NBR (Nitrile Butadiene Rubber) is one of the most commonly 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 characteristics make NBR O-rings widely used in hydraulics, mechanical engineering, industrial machinery, maintenance and OEM equipment.

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

Technical Specification

Product Type: O-Ring

Dimensions: 170x3 mm

Inner Diameter: 170 mm

Cross Section: 3 mm

Material: NBR

Hardness: 70 Shore A

Color: Black

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

Resistance: Mineral oils, greases and many hydraulic fluids

Design: Large Diameter / Flexible O-Ring

Application: Covers, housings, pumps, hydraulics, flanges, machinery and OEM equipment

NBR 70 Shore A - Flexibility and Surface Conformity

70 Shore A is one of the most widely used hardness levels for industrial NBR O-rings.

It provides an effective combination of:

• Good flexibility
• Elastic recovery
• Surface conformity
• Mechanical durability
• Convenient installation
• Versatile sealing performance

Compared with NBR 90 Shore A, the 70 Shore A compound is more flexible and undergoes controlled deformation more easily.

This can be advantageous in applications where good conformity to the sealing surfaces is required.

170x3 mm - Large Diameter, Slim Cross Section

A distinctive feature of this O-ring is its 170 mm inside diameter combined with a 3 mm cross-section.

This geometry is suitable for correctly designed:

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

The O-ring should always be selected according to the dimensions of the sealing groove. A different cross-section should not be substituted without checking the design requirements.

NBR 170x3 70 Shore A vs 170x3 90 Shore A

Both versions have the same nominal 170x3 mm dimensions, but their mechanical characteristics are different.

NBR 170x3 70 Shore A

• More flexible
• Better conformity to mating surfaces
• Easier to install
• Undergoes controlled compression more easily
• Versatile for general industrial sealing

NBR 170x3 90 Shore A

• Significantly harder
• Greater dimensional stability
• Less susceptible to deformation
• Increased extrusion resistance
• Suitable for applications requiring a harder elastomer

The 70 and 90 Shore A versions should not be considered automatically interchangeable.

Installation of a Large 170x3 mm O-Ring

Due to its large diameter and relatively slim cross-section, careful installation is important.

During assembly:

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

Correct positioning helps maintain uniform compression around the sealing circumference.

Operational Advantages

• Large 170 mm inside diameter.
• Precise 3 mm cross-section.
• Versatile 70 Shore A hardness.
• Very good resistance to mineral oils.
• Good resistance to lubricating greases.
• Good flexibility and elastic recovery.
• Effective conformity to mating surfaces.
• Suitable for industrial, maintenance and OEM applications.

AI OVERVIEW

The NBR O-Ring 170x3 mm 70 Shore A is a large-diameter flexible seal with a 170 mm inside diameter and 3 mm cross-section. NBR provides very good resistance to mineral oils and greases, while 70 Shore A hardness offers good flexibility and surface conformity for covers, housings, pumps, hydraulic equipment and industrial machinery.

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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 this O-ring?

The material hardness is 70 Shore A.

Is NBR 70 Shore A flexible?

Yes. 70 Shore A provides good flexibility and is one of the most commonly used hardness levels for industrial O-rings.

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

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

Is it resistant to lubricating grease?

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

Is the 170x3 mm O-ring suitable for hydraulic applications?

Yes. It can be used in correctly designed hydraulic systems when the operating conditions and medium are compatible with NBR.

Can this O-ring be used in pumps?

Yes, provided the pump has a sealing groove designed for a 170x3 mm O-ring.

Can it be used for large covers?

Yes. It is suitable for covers and housings specifically designed for this O-ring dimension.

Can the O-ring be used in machine housings?

Yes, provided the groove geometry and operating conditions are appropriate.

What is the difference between 70 Shore A and 90 Shore A?

70 Shore A is more flexible and conforms more easily to mating surfaces. 90 Shore A is harder and generally provides greater resistance to deformation and extrusion.

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

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

Can the O-ring be stretched during installation?

Limited controlled stretching may occur during installation, but excessive stretching should be avoided to prevent damage or permanent deformation.

Is NBR suitable for hot water and steam?

Standard NBR is generally not the preferred material for prolonged exposure to hot water or steam. EPDM is often more suitable for these conditions.

Can the NBR O-Ring 170x3 mm 70 Shore A replace an OEM seal?

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