O-Ring 59x5 NBR 70 ShA

O-Ring 59x5 NBR 70 ShA - Industrial Sealing Ring for Hydraulics and Machinery

O-Ring 59x5 NBR 70 ShA is a technical elastomeric sealing ring with a 59 mm inside diameter and 5 mm cross-section, manufactured from NBR nitrile butadiene rubber with a nominal hardness of 70 Shore A. Its nominal outside diameter is 69 mm. The substantial 5 mm cross-section makes this O-ring suitable for appropriately designed sealing grooves in hydraulic systems, pneumatic equipment, pumps, housings and industrial machinery operating with compatible mineral oils, greases and technical fluids.

Technical Specifications

Product Type: O-Ring / sealing ring
Material: NBR - Nitrile Butadiene Rubber / Buna-N
Hardness: 70 ShA / 70 Shore A
Inside Diameter: 59 mm
Cross-Section: 5 mm
Nominal Outside Diameter: 69 mm
Color: Black
Typical Temperature Range: approximately -30 to +100°C for standard NBR compounds
Chemical Resistance: Many mineral oils, lubricating greases and compatible technical fluids
Application: Hydraulics, pneumatics, pumps, machinery, housings and industrial equipment

The exact temperature range and chemical resistance depend on the specific NBR compound, operating medium and service conditions.

59x5 mm O-Ring Dimensions

The principal dimensions are:

Inside Diameter: 59 mm
Cross-Section: 5 mm
Nominal Outside Diameter: 69 mm

The nominal outside diameter is calculated as:

59 + 5 + 5 = 69 mm

O-rings are normally identified by their inside diameter and cross-section. Therefore, the primary dimensional designation for this product is 59x5 mm.

5 mm Cross-Section

The 5 mm cross-section is an important characteristic of this sealing ring.

Compared with thinner O-rings, the larger section provides a greater volume of elastomer within the sealing groove and therefore requires appropriately matched groove dimensions.

An O-ring with the same inside diameter but a different cross-section should not automatically be used as a replacement.

Correct groove depth, width and compression are essential for reliable sealing performance.

Why NBR 70 ShA?

NBR 70 Shore A is one of the most commonly used material and hardness combinations in industrial sealing technology.

NBR provides good resistance to many:

• mineral oils
• lubricating greases
• compatible hydraulic oils
• machine lubricants
• oil-based technical fluids

A nominal hardness of 70 Shore A provides a practical balance between elasticity, sealing contact and resistance to deformation.

For these reasons, NBR 70 ShA is widely used in hydraulics, pneumatics, machine building, maintenance and general industrial sealing.

Industrial Applications

The 59x5 NBR 70 ShA O-ring can be used in appropriately designed:

• hydraulic systems
• pneumatic systems
• pumps
• valves
• mechanical housings
• flange connections
• industrial machinery
• production equipment
• lubrication systems
• static sealing joints

Suitability should always be evaluated according to groove dimensions, operating pressure, temperature and fluid compatibility.

Hydraulic Applications

NBR O-rings are widely used in hydraulic equipment operating with compatible mineral oil based hydraulic fluids.

The 59x5 mm O-ring may be used in housings, covers, valves, connections and other hydraulic components where this exact seal size is specified.

For higher-pressure systems, the extrusion gap becomes particularly important. Depending on the sealing arrangement, a backup ring may also be required.

Pressure capability cannot be determined from O-ring dimensions alone.

Pneumatic Applications

NBR sealing rings are also widely used in pneumatic equipment.

The 59x5 size may be suitable for appropriately designed valves, housings, connectors and other compressed-air system components.

In dynamic pneumatic applications, additional factors such as friction, lubrication, movement speed and mating surface finish should be considered.

Pumps and Machine Housings

The 59x5 NBR O-ring can be used as a sealing element between appropriately designed pump components, covers and machine housings.

In a static connection, the O-ring is compressed between mating surfaces to form a sealing barrier.

Sealing performance depends on several factors, including:

• groove dimensions
• compression
• groove filling
• surface condition
• operating temperature
• pressure
• fluid compatibility

Static Sealing Applications

O-rings are particularly effective as static sealing elements when installed in correctly dimensioned grooves.

Compression of the 5 mm cross-section produces sealing contact between the elastomer and mating surfaces.

Insufficient compression may reduce sealing effectiveness, while excessive compression can increase deformation and assembly forces.

The groove should therefore be designed specifically for the required O-ring size.

Dynamic Sealing Applications

NBR 70 ShA can also be used in appropriately designed dynamic O-ring applications.

Dynamic sealing requires additional consideration because relative movement introduces friction and wear.

Important factors include:

• movement speed
• lubrication
• friction
• surface finish
• pressure
• temperature
• extrusion clearance
• expected wear

The 59x5 mm dimensions alone do not determine suitability for dynamic operation.

Resistance to Oils and Greases

One of the principal advantages of NBR is its resistance to many conventional mineral oils and lubricating greases.

This makes nitrile rubber particularly useful in:

• hydraulic equipment
• industrial machinery
• lubrication systems
• mechanical assemblies
• machine maintenance
• MRO operations

NBR is not universally compatible with every chemical or operating fluid. Compatibility should be checked when the application involves unusual media or demanding temperatures.

Installation of the 59x5 O-Ring

Before installation, inspect and clean the sealing groove and mating surfaces.

The O-ring should not be:

• twisted
• cut
• excessively stretched
• pinched during assembly
• pulled unprotected across sharp edges
• installed in a damaged or contaminated groove

If an assembly lubricant is required, it should be compatible with both the NBR elastomer and the operating medium.

Groove Design for a 5 mm Cross-Section

The groove must be suitable for the 5 mm O-ring cross-section.

A groove that is too shallow can cause excessive compression, while an excessively deep groove may result in insufficient sealing contact.

Groove width must also provide sufficient space for the elastomer to deform when compressed.

Pressure, extrusion clearance and the type of sealing arrangement should be considered when determining the correct groove geometry.

O-Ring 59x5 vs 59x4

A 59x5 O-ring should not automatically be replaced by a 59x4 O-ring.

Although both sizes have the same nominal 59 mm inside diameter, their cross-sections are different:

59x5: 5 mm cross-section
59x4: 4 mm cross-section

This difference directly affects compression, groove filling and sealing contact.

The replacement O-ring should therefore match the dimensions specified for the sealing groove.

Storage of NBR O-Rings

NBR O-rings should be stored under conditions that help minimize premature elastomer ageing.

Protect them against:

• direct sunlight
• UV radiation
• ozone
• excessive heat
• aggressive chemicals
• permanent stretching
• mechanical deformation

Suitable storage helps preserve the physical properties of the sealing material before installation.

How to Select a 59x5 NBR O-Ring

Before installation, verify:

Inside Diameter: 59 mm
Cross-Section: 5 mm
Material: NBR
Hardness: 70 ShA
Nominal Outside Diameter: 69 mm
Operating Medium: Compatible with NBR
Temperature: Suitable for the specific compound
Pressure: Suitable for the sealing arrangement
Groove Geometry: Designed for a 5 mm cross-section
Application: Static or appropriately designed dynamic sealing

Dimensions alone are not sufficient to determine complete suitability for a particular machine or sealing system.

Operational Advantages

5 mm cross-section: provides a substantial sealing section for appropriately designed industrial grooves.

59 mm inside diameter: enables precise dimensional identification for replacement and technical purchasing.

NBR 70 ShA: widely used elastomer and hardness combination for industrial sealing.

Oil and grease resistance: NBR is compatible with many mineral oils and lubricating greases.

Continuous sealing ring: provides circumferential sealing without a joint in the O-ring.

Industrial versatility: suitable for appropriately designed hydraulic systems, pneumatic equipment, pumps and machinery.

POPULAR SEARCHES

O-Ring 59x5 NBR 70 ShA

O-Ring 59x5 NBR

59x5 O-Ring

NBR O-Ring 59x5

59 mm O-Ring

O-Ring 59 mm ID 5 mm

59x5 sealing ring

NBR 70 Shore A O-Ring

Industrial O-Ring 59x5

Hydraulic O-Ring 59x5

Pneumatic O-Ring 59x5

O-Ring for pump 59x5

NBR sealing ring 59x5

Industrial sealing ring 59x5

FAQ - O-Ring 59x5 NBR 70 ShA

What are the dimensions of the 59x5 NBR O-ring?
The O-ring has a 59 mm inside diameter and 5 mm cross-section.

What is the outside diameter of a 59x5 O-ring?
The nominal outside diameter is 69 mm.

What does NBR 70 ShA mean?
NBR means Nitrile Butadiene Rubber, while 70 ShA specifies the nominal elastomer hardness on the Shore A scale.

Is the 59x5 NBR O-ring resistant to oil?
NBR provides good resistance to many mineral oils and lubricating greases. Compatibility should still be checked for the specific operating fluid and temperature.

Can the 59x5 O-ring be used in hydraulic systems?
Yes, provided the hydraulic fluid is compatible with NBR and the groove geometry, pressure and temperature are appropriate.

Can a 59x5 O-ring be replaced with a 59x4 O-ring?
Not automatically. Changing the cross-section from 5 mm to 4 mm significantly changes compression and groove filling.

Frequently Asked Questions by Engineers

What does the 59x5 dimension mean?
The first value, 59 mm, is the nominal inside diameter, while 5 mm is the cross-sectional thickness of the O-ring.

Is the 69 mm outside diameter the primary ordering dimension?
Normally no. O-rings are primarily specified by inside diameter and cross-section, so the correct designation is 59x5 mm.

Can NBR 70 ShA be used for sealing a pump housing?
Yes, provided the housing groove is designed for a 59x5 mm O-ring and the operating medium and temperature are compatible with NBR.

Why is the correct 5 mm cross-section important?
Cross-section directly affects groove filling and compression. An incorrect section can result in insufficient sealing, excessive compression or assembly problems.

Can the 59x5 O-ring operate dynamically?
It can be used in appropriately designed dynamic systems, but friction, lubrication, movement speed, surface finish, pressure and wear must be evaluated.