O-Ring 32x1 NBR 70 ShA

O-Ring 32x1 NBR 70 ShA - 100 pcs Thin Nitrile Sealing Ring

O-Ring 32x1 NBR 70 ShA - 100 pcs is a thin elastomeric sealing ring with a 32 mm inside diameter and 1 mm cross-section, manufactured from NBR nitrile rubber with a nominal hardness of 70 Shore A. The small 1 mm cross-section makes this O-ring suitable for compact sealing grooves where installation space is limited. NBR is widely used with many mineral oils and lubricating greases, making this size relevant to hydraulic, pneumatic, machinery maintenance and general industrial sealing applications.

Technical Specifications

Product Type: O-Ring / sealing ring
Material: NBR - Nitrile Butadiene Rubber / Buna-N
Hardness: 70 ShA / 70 Shore A
Inside Diameter: 32 mm
Cross-Section: 1 mm
Nominal Outside Diameter: 34 mm
Color: Black
Typical Temperature Range: approximately -30 to +100°C for standard NBR compounds
Chemical Resistance: Many mineral oils, greases and compatible technical fluids
Packaging: 100 pcs

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

32x1 mm O-Ring Dimensions

The principal dimensions are:

Inside Diameter: 32 mm
Cross-Section: 1 mm
Nominal Outside Diameter: 34 mm

The outside diameter is calculated as:

32 + 1 + 1 = 34 mm

O-rings are normally identified by their inside diameter and cross-section. Therefore, the primary ordering dimension for this product is 32x1 mm.

Thin 1 mm Cross-Section

The distinguishing feature of this O-ring is its 1 mm cross-section.

This thin profile makes it suitable for compact assemblies and narrow sealing grooves specifically designed for a small cross-sectional seal.

Because the elastomer section is relatively thin, groove accuracy and installation technique are particularly important.

The O-ring should not be excessively stretched, twisted or pulled across sharp edges during assembly.

Why NBR 70 ShA?

NBR 70 Shore A is one of the most commonly used elastomer specifications for general technical sealing.

NBR provides good resistance to many:

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

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

This combination is widely used in industrial machinery, hydraulic components, pneumatic equipment and general mechanical assemblies.

Industrial Applications

The 32x1 NBR 70 ShA O-ring can be used in appropriately designed:

• hydraulic systems
• pneumatic systems
• valves
• fittings
• pumps
• technical equipment
• measuring devices
• industrial machinery
• mechanical assemblies
• static sealing connections

The 1 mm cross-section should only be installed in a groove designed for this specific seal geometry.

Static Sealing Applications

In static applications, the O-ring is compressed between two mating surfaces to create a sealing barrier.

Correct sealing performance depends on the relationship between the 1 mm cross-section and the groove dimensions.

Other important factors include operating pressure, temperature, surface finish and compatibility between NBR and the working fluid.

Due to the thin cross-section, relatively small dimensional changes can significantly affect percentage compression.

Hydraulic Applications

NBR is widely used in hydraulic systems operating with compatible mineral oil based hydraulic fluids.

The 32x1 mm O-ring may be suitable for hydraulic fittings, valves and other components where this specific groove size is required.

For higher-pressure applications, additional factors such as extrusion clearance, pressure direction and groove geometry must be evaluated.

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

Pneumatic Applications

The O-ring can also be used in appropriately designed pneumatic equipment.

Possible applications include fittings, connectors, valves and control components.

In dynamic pneumatic systems, additional consideration should be given to friction, lubrication, movement speed and surface finish.

Resistance to Oils and Greases

A major reason for using NBR nitrile rubber is its resistance to many commonly used mineral oils and lubricating greases.

This makes NBR particularly useful in machine building, maintenance, hydraulics and industrial equipment containing oil-based lubricants.

However, NBR is not universally compatible with every chemical or operating fluid. Compatibility should be checked before use with unusual media or elevated temperatures.

100 pcs Pack for Maintenance and Service

The 100 pcs package provides a practical quantity for users who require a working stock of one specific O-ring size.

It is suitable for:

• maintenance departments
• repair workshops
• machine servicing
• technical assembly
• spare parts inventory
• recurring maintenance operations

The 100 pcs format provides a convenient service quantity without requiring a large industrial bulk package.

Installation of a 1 mm O-Ring

Extra care should be taken when installing a thin O-ring.

Before assembly, inspect the groove and mating surfaces for dirt, burrs and sharp edges.

Avoid:

• excessive stretching
• twisting the O-ring
• cutting the elastomer
• pinching during assembly
• pulling the seal directly over sharp threads
• installing the seal in a damaged groove

If an assembly lubricant is used, it must be compatible with both NBR and the operating medium.

Storage of NBR O-Rings

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

The seals should be protected against:

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

Keeping the O-rings in suitable packaging until required for installation helps protect the stored components.

How to Select a 32x1 NBR O-Ring

Before installation, verify:

Inside Diameter: 32 mm
Cross-Section: 1 mm
Material: NBR
Hardness: 70 ShA
Operating Medium: Compatible with NBR
Temperature: Suitable for the compound
Pressure: Suitable for the sealing arrangement
Groove: Designed for a 1 mm cross-section
Application: Static or appropriately designed dynamic sealing

The 32x1 mm dimensions alone are not sufficient to determine suitability for every application.

Operational Advantages

1 mm cross-section: suitable for compact sealing grooves where installation space is limited.

32 mm inside diameter: provides clearly defined dimensional identification.

NBR 70 ShA: widely used material and hardness combination for technical sealing.

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

100 pcs packaging: practical quantity for maintenance, servicing and technical inventory.

Defined 32x1 mm size: simplifies identification for replacement and technical purchasing.

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FAQ - O-Ring 32x1 NBR 70 ShA

What are the dimensions of the 32x1 NBR O-ring?
The O-ring has a 32 mm inside diameter and 1 mm cross-section.

What is the outside diameter of a 32x1 O-ring?
The nominal outside diameter is 34 mm.

How many O-rings are included in the package?
The package contains 100 pcs of 32x1 NBR 70 ShA O-rings.

What does 70 ShA mean?
70 ShA indicates the nominal hardness of the elastomer measured on the Shore A scale.

Is the 32x1 NBR O-ring resistant to oil?
NBR provides good resistance to many mineral oils and lubricating greases. Compatibility should still be verified for the specific operating fluid.

Why does the 1 mm cross-section require careful installation?
A thin O-ring is more sensitive to cutting, twisting and excessive stretching. Correct groove dimensions and careful installation are therefore particularly important.

Frequently Asked Questions by Engineers

Does 32x1 mean inside diameter and cross-section?
Yes. 32 mm is the nominal inside diameter and 1 mm is the cross-sectional thickness.

Can a 32x1 O-ring be replaced with a 32x1.5 O-ring?
Not automatically. Increasing the cross-section from 1 mm to 1.5 mm significantly changes compression and groove filling and may prevent correct assembly.

Can NBR 70 ShA be used in hydraulic systems?
Yes, provided the fluid is compatible with NBR and the groove, pressure and operating conditions are appropriate.

Can this thin O-ring be used dynamically?
It may be used in appropriately designed dynamic applications, but friction, lubrication, speed, surface finish and wear must be considered.

Why is groove accuracy especially important with a 1 mm cross-section?
Because the cross-section is very small, even minor dimensional differences can produce a relatively large change in percentage compression and sealing conditions.