O-Ring 140x5 NBR 70 Shore

AI Overview

The 140x5 mm O-Ring manufactured from NBR 70 Shore rubber is an elastomer sealing ring intended for static and selected low-speed dynamic sealing applications. NBR provides good resistance to mineral oils, greases, hydraulic fluids and aliphatic hydrocarbons, making it one of the most commonly used sealing materials in industrial equipment, hydraulic systems, pneumatic installations and agricultural machinery. The 140 mm inner diameter and 5 mm cross-section make this O-Ring suitable for larger housings where reliable sealing and dimensional stability are required.

What Makes This Model Different

This O-Ring combines a large internal diameter with a relatively thick 5 mm cross-section, providing stable sealing in medium and large industrial assemblies.

Key characteristics include:

• 140 mm internal diameter
• 5 mm cross-section
• NBR 70 Shore hardness
• Good resistance to mineral oils
• Suitable for hydraulic and pneumatic sealing
• Compatible with standard O-Ring grooves designed for ISO metric dimensions

The 70 Shore hardness offers a balance between flexibility, sealing efficiency and mechanical durability.

Construction and Operating Principle

An O-Ring seals by being compressed between two mating components.

During assembly, the elastomer deforms elastically, filling microscopic surface irregularities and creating a pressure-tight seal.

As system pressure increases, the sealing force acting on the O-Ring also increases, improving sealing performance.

Reliable operation depends on:

• correct groove dimensions
• appropriate compression
• proper surface finish
• compatible lubricant
• suitable operating temperature
• correct installation without twisting

Material Properties

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

Material characteristics include:

• good resistance to mineral oils
• resistance to hydraulic oils
• compatibility with greases
• good abrasion resistance
• low gas permeability
• good mechanical strength
• reliable elasticity for general industrial applications

NBR is generally not recommended for prolonged exposure to ozone, strong oxidizing agents or weathering.

Typical Industrial Applications

Typical applications include:

• hydraulic cylinders
• hydraulic manifolds
• industrial pumps
• gearboxes
• compressors
• pneumatic valves
• agricultural machinery
• construction equipment
• industrial automation systems
• machine rebuilding projects

Typical Failure Symptoms

Replacement should be considered when the following symptoms are observed:

• external oil leakage
• hydraulic pressure loss
• pneumatic air leakage
• flattened sealing profile
• cracking caused by ageing
• extrusion damage
• swelling due to incompatible media
• permanent compression set

Recommended During Repair

During maintenance it is recommended to inspect:

• sealing groove
• mating surfaces
• shaft or piston condition
• housing cleanliness
• lubricant compatibility
• backup rings where applicable
• hydraulic fluid condition
• installation tools
• surface scratches
• dimensional tolerances

Technical Specification

Manufacturer:

Industrial Standard

Part Number:

140X5 NBR 70

Type:

O-Ring

Design:

Metric O-Ring

Material:

NBR (Nitrile Butadiene Rubber)

Inner Diameter:

140 mm

Cross Section:

5 mm

Hardness:

70 Shore A

Temperature:

Suitable for the operating temperature range typical of NBR elastomers.

Application:

Hydraulic systems, pneumatic equipment, industrial machinery, agricultural equipment and general mechanical engineering.

OEM Cross References

This product is manufactured according to standard metric O-Ring dimensions and is intended for applications requiring:

• 140x5 O-Ring
• Metric sealing ring
• NBR 70 Shore O-Ring

OEM reference depends on the equipment manufacturer.

Related Components

Products frequently replaced together include:

• hydraulic seals
• backup rings
• guide rings
• piston seals
• rod seals
• bearing housings
• hydraulic oil
• pneumatic fittings
• retaining rings
• flange gaskets

Why B2B Customers Choose This Product

Professional buyers commonly use this O-Ring for:

• preventive maintenance
• industrial service
• hydraulic repairs
• machine rebuilding
• production support
• maintenance stock
• OEM replacement
• MRO inventory

Professional Industrial Supply

This sealing component is regularly supplied to:

• maintenance departments
• industrial workshops
• hydraulic repair specialists
• pneumatic service companies
• agricultural machinery workshops
• machine builders
• OEM manufacturers
• industrial distributors
• automation integrators
• engineering companies

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FAQ

Should an O-Ring always be lubricated before installation?

A compatible lubricant is recommended in most hydraulic and pneumatic applications to reduce installation damage and improve service life.

Can an old O-Ring groove be reused?

Yes, provided the groove is free from corrosion, scratches and permanent deformation.

Does a higher Shore hardness always provide better sealing?

No. Hardness should match the application, pressure and groove design.

Can incompatible hydraulic fluids damage an NBR O-Ring?

Yes. Chemical incompatibility may cause swelling, hardening or loss of elasticity.

Should an O-Ring be replaced after disassembly?

In most maintenance procedures, replacing the O-Ring is recommended to ensure reliable sealing.