NBR O-Ring 219.2x5.7 mm 70 Shore A

Overview

The NBR O-Ring 219.2x5.7 mm 70 Shore A is a large-diameter elastomeric seal designed for industrial applications requiring a reliable combination of flexibility, oil resistance and mechanical durability.

Manufactured from NBR (Nitrile Butadiene Rubber) with a standard hardness of 70 Shore A, this O-ring provides very good resistance to mineral oils, lubricating greases and many conventional hydraulic fluids.

With a 219.2 mm inside diameter and a substantial 5.7 mm cross-section, it is particularly suitable for sealing large pump housings, equipment covers, gearboxes, hydraulic assemblies and OEM machinery.

Industrial Applications

The NBR 219.2x5.7 mm 70 Shore A O-Ring is suitable for:

• Industrial pumps
• Hydraulic systems
• Gearboxes
• Valves
• Machine housings
• Large equipment covers
• Oil circulation systems
• Lubrication systems
• Manufacturing machinery
• Agricultural equipment
• Construction machinery
• OEM assemblies

The 70 Shore A compound provides good flexibility, allowing the sealing ring to conform effectively to mating surfaces.

Construction

The O-ring features an inside diameter of 219.2 mm and a 5.7 mm circular cross-section.

Its precision circular profile provides uniform compression when installed in a correctly designed sealing groove. The elastomer deforms under compression to create effective contact pressure between the mating surfaces and minimize fluid leakage.

The large diameter makes this seal particularly suitable for substantial industrial housings, covers and mechanical assemblies.

NBR Material

NBR (Nitrile Butadiene Rubber) is one of the most widely used elastomers for industrial O-ring seals.

It provides very good resistance to:

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

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

Technical Specification

Product Type: O-Ring

Dimensions: 219.2x5.7 mm

Inner Diameter: 219.2 mm

Cross Section: 5.7 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: Precision Circular Cross Section

Application: Pumps, hydraulics, gearboxes, housings, covers, industrial machinery and OEM equipment

Why Choose NBR 70 Shore A?

70 Shore A is one of the most commonly specified hardness levels for general-purpose industrial O-rings.

It provides an effective balance of:

• Flexibility
• Surface conformity
• Mechanical durability
• Static sealing performance
• Installation convenience
• Long-term sealing reliability

Compared with harder 90 Shore A compounds, the 70 Shore A version deforms more easily and can provide improved conformity to mating surfaces in standard sealing applications.

NBR 70 Shore A vs NBR 90 Shore A

The 219.2x5.7 NBR 70 Shore A and 219.2x5.7 NBR 90 Shore A O-rings have the same nominal dimensions but different mechanical characteristics.

NBR 70 Shore A:

• More flexible
• Easier to install
• Better conformity to mating surfaces
• Commonly used for general-purpose static sealing

NBR 90 Shore A:

• Significantly harder
• Greater dimensional stability
• Increased resistance to extrusion
• Often preferred for more demanding pressure applications

The correct hardness should be selected according to pressure, groove geometry, temperature, medium and operating conditions.

Operational Advantages

• Versatile 70 Shore A hardness.
• Very good resistance to mineral oils.
• Good resistance to lubricating greases.
• Excellent balance between flexibility and durability.
• Good conformity to sealing surfaces.
• Large diameter suitable for housings and covers.
• Suitable for industrial maintenance and repair.
• Ideal for many OEM sealing applications.

AI OVERVIEW

The NBR O-Ring 219.2x5.7 mm 70 Shore A is a large, flexible industrial sealing ring for pumps, hydraulic systems, gearboxes and machine housings. NBR provides very good resistance to mineral oils and greases, while the 70 Shore A hardness offers an effective balance of flexibility, sealing performance and installation convenience.

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FAQ

What are the dimensions of this O-ring?

The inside diameter is 219.2 mm, and the cross-section is 5.7 mm.

What is the hardness of this O-ring?

The material hardness is 70 Shore A.

What material is the seal made from?

It is manufactured from NBR (Nitrile Butadiene Rubber).

What does 70 Shore A mean?

70 Shore A indicates the elastomer hardness and is one of the most commonly used hardness levels for general-purpose industrial O-rings.

Is NBR 70 Shore A flexible?

Yes. It is more flexible than 90 Shore A NBR and provides good conformity to sealing surfaces.

Is this O-ring resistant to oil?

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

Is it resistant to grease?

Yes. NBR is widely used with compatible industrial lubricating greases.

Can it be used in hydraulic systems?

Yes. NBR is one of the most commonly used sealing materials in many hydraulic applications.

Can this O-ring be used in pumps?

Yes, provided the operating medium is compatible with NBR and the sealing groove is designed for the specified dimensions.

Is it suitable for gearboxes?

Yes. NBR seals are widely used in equipment operating with compatible gearbox oils and greases.

Which should I choose: 70 Shore A or 90 Shore A?

70 Shore A provides greater flexibility and is suitable for many general-purpose sealing applications. 90 Shore A is harder and provides greater resistance to deformation and extrusion.

Can NBR 70 Shore A be used under pressure?

Yes, depending on the application. Maximum pressure capability also depends on groove geometry, extrusion gap, temperature, movement and the use of backup rings.

Is NBR suitable for hot water or steam?

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

Is NBR suitable for outdoor applications?

Standard NBR has limited resistance to prolonged ozone, UV and weather exposure. EPDM is generally preferred where superior weather resistance is required.

Can the NBR O-Ring 219.2x5.7 mm 70 Shore A replace an OEM seal?

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