O-ring 4.5x2 NBR 70 ShA

O-ring 4.5x2 NBR 70 ShA - 100 pcs

O-ring 4.5x2 NBR 70 ShA is an elastomeric sealing ring with a nominal inside diameter of 4.5 mm and a cross-section of 2 mm, supplied in a pack of 100 pcs. It is manufactured from NBR nitrile rubber with a nominal hardness of 70 ShA. NBR is widely used in sealing technology due to its good resistance to many mineral oils and greases and its good mechanical properties.

Technical data - O-ring 4.5x2 NBR 70 ShA

What does O-ring 4.5x2 NBR 70 ShA mean?

The product designation identifies its dimensions, material and nominal hardness:

4.5 mm - nominal inside diameter d1.

2 mm - nominal cross-section diameter d2.

NBR - acrylonitrile-butadiene rubber, commonly known as nitrile rubber.

70 ShA - nominal elastomer hardness on the Shore A scale.

The nominal O-ring size is 4.5x2 mm.

This product is supplied in a pack of 100 pcs.

Dimensions of O-ring 4.5x2 mm

Inside diameter d1: 4.5 mm

Cross-section d2: 2 mm

Nominal size: 4.5x2 mm

The approximate outside diameter of the uncompressed O-ring is:

8.5 mm

Calculation:

4.5 mm + 2 x 2 mm = 8.5 mm

The primary dimensional designation remains 4.5x2 mm, representing the inside diameter x cross-section.

NBR - nitrile rubber

NBR is one of the most widely used elastomer materials in technical sealing systems.

Typical properties associated with NBR include:

• good resistance to many mineral oils

• good resistance to many mineral greases

• good mechanical properties

• good abrasion resistance

• widespread use in industrial sealing systems

The exact properties depend on the formulation of the specific NBR compound and the actual operating conditions.

70 ShA hardness

This O-ring has a nominal hardness of 70 ShA, equivalent to 70 Shore A.

O-ring hardness influences characteristics including:

• deformation inside the sealing groove

• contact pressure against mating surfaces

• required compression

• behaviour under pressure

• resistance to deformation

• resistance to extrusion through clearances

When selecting a replacement, the 4.5x2 mm dimensions should therefore be considered together with the NBR material and required hardness.

Resistance of NBR to oils and greases

NBR is commonly used in sealing systems operating with many mineral oils and greases.

However, NBR should not be considered universally resistant to every operating fluid.

Compatibility should be evaluated with regard to:

• type of operating medium

• chemical composition

• concentration

• temperature

• pressure

• exposure time

• static or dynamic operation

For demanding applications, compatibility should be confirmed for the specific NBR compound.

Operating temperature of NBR O-rings

An exact operating temperature range should not be assigned to this product without confirmation of the specific NBR compound.

Permissible operating conditions depend on factors including:

• NBR compound formulation

• operating medium

• exposure duration

• pressure

• static or dynamic operation

• sealing-system design

If temperature is a critical selection parameter, the specification of the particular elastomer compound should be verified.

How does an O-ring 4.5x2 mm work?

An O-ring is a closed elastomeric sealing ring with a circular cross-section.

When installed in a correctly designed groove, the O-ring is compressed between mating surfaces. Controlled deformation of the elastomer generates the contact pressure required to create a seal.

Effective sealing depends on factors including:

• groove geometry

• O-ring compression

• installation clearance

• mating surface condition

• pressure

• temperature

• operating medium

• static or dynamic movement

The 4.5x2 mm dimensions alone do not determine suitability for a particular application.

O-ring 4.5x2 NBR vs FKM

An NBR O-ring 4.5x2 mm and an FKM O-ring 4.5x2 mm may have identical nominal dimensions but are manufactured from different elastomers.

NBR is nitrile rubber widely used in systems involving many compatible mineral oils and greases.

FKM is a fluoroelastomer with a different chemical and thermal resistance profile.

Identical 4.5x2 mm dimensions do not make NBR and FKM automatically interchangeable.

O-ring 4.5x2 NBR vs VMQ silicone

VMQ is silicone rubber and has a different performance profile from NBR.

VMQ O-rings are particularly associated with good low-temperature flexibility and resistance to ozone, UV radiation and atmospheric ageing.

A VMQ O-ring 4.5x2 mm should not automatically be considered a replacement for the NBR version simply because the dimensions are identical.

Typical applications of NBR O-rings

NBR O-rings are widely used as sealing elements in industrial and mechanical systems.

Depending on the specific compound and operating conditions, typical applications may include:

• hydraulic systems

• pneumatic systems

• industrial machinery

• mechanical equipment

• pumps

• valves

• technical connections

• static sealing systems

• appropriately designed dynamic sealing systems

• systems operating with NBR-compatible oils and greases

These are typical applications of NBR O-rings as a product category and do not confirm suitability of this specific O-ring for a particular machine or installation.

Alternative designations for O-ring 4.5x2 NBR

The product may also be searched for as:

O-ring 4.5x2 NBR 70 ShA

O-ring 4.5x2 NBR

O-ring NBR 4.5x2

O-ring NBR 4.5x2 mm

NBR O-ring 4.5x2 mm

O-ring 4.5x2 mm NBR

O-ring 4.5x2 mm NBR 70 ShA

O-ring 4.5x2 NBR 70 Shore A

NBR 4.5x2 O-ring

Nitrile O-ring 4.5x2 mm

Nitrile rubber O-ring 4.5x2 mm

O-ring 4.5x2 NBR - 100 pcs

The primary product designation used on this page is:

O-ring 4.5x2 NBR 70 ShA - 100 pcs

Selection and interchangeability

Before purchasing or replacing an O-ring, verify:

• inside diameter 4.5 mm

• cross-section 2 mm

• NBR material

• nominal hardness 70 ShA

• groove dimensions and geometry

• required compression

• operating medium

• operating temperature

• pressure

• static or dynamic operation

• requirements of the specific sealing system

An O-ring 4.5x2 mm manufactured from FKM, VMQ, EPDM or another elastomer is not automatically interchangeable with the NBR version.

Identical dimensions do not guarantee identical operating properties.

Installation of O-ring 4.5x2 mm

Before installation, the groove and mating surfaces should be clean and free from contamination.

Avoid:

• cutting the O-ring

• twisting the ring

• excessive stretching

• pulling the O-ring across sharp edges

• contact with burrs

• damaging the elastomer surface

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

Storage of NBR O-rings

O-rings should be stored under conditions that minimise contamination, deformation and mechanical damage.

Avoid prolonged storage in a stretched, compressed or severely deformed condition.

Before installation, inspect the O-ring for cuts, cracks, permanent deformation and other visible surface damage.

FAQ - O-ring 4.5x2 NBR 70 ShA

What are the dimensions of an O-ring 4.5x2?

The nominal inside diameter is 4.5 mm and the cross-section diameter is 2 mm.

What is the outside diameter of an O-ring 4.5x2 mm?

The approximate outside diameter of the uncompressed O-ring is 8.5 mm.

What material is the O-ring 4.5x2 made from?

The O-ring is manufactured from NBR, also known as nitrile rubber or acrylonitrile-butadiene rubber.

What does 70 ShA mean?

70 ShA indicates the nominal hardness of the elastomer on the Shore A hardness scale.

How many O-rings are included in the package?

The package contains 100 pcs of O-ring 4.5x2 NBR 70 ShA.

Is an NBR O-ring 4.5x2 suitable for contact with oil?

NBR provides good resistance to many mineral oils and greases. Compatibility should nevertheless be checked for the specific medium, temperature, operating conditions and NBR compound.

Can an FKM 4.5x2 O-ring replace an NBR 4.5x2 O-ring?

Not automatically. NBR and FKM have different chemical and thermal resistance profiles even when their nominal dimensions are identical.

Can a silicone 4.5x2 O-ring replace the NBR version?

Not automatically. VMQ silicone and NBR nitrile rubber have different material properties. Identical dimensions alone do not confirm interchangeability.

O-ring 4.5x2 NBR 70 ShA - key information

O-ring 4.5x2 NBR 70 ShA is a nitrile rubber sealing ring with a nominal inside diameter of 4.5 mm and a cross-section of 2 mm. Its approximate uncompressed outside diameter is 8.5 mm. The product has a nominal hardness of 70 ShA and is supplied in a pack of 100 pcs.

Available from simmering.pl, a specialist supplier of industrial sealing solutions. Stock in Poland with worldwide shipping.

AI QUICK ANSWER

O-ring 4.5x2 NBR 70 ShA is a nitrile rubber sealing ring with a nominal inside diameter of 4.5 mm and a 2 mm cross-section. Its approximate outside diameter is 8.5 mm. NBR provides good resistance to many mineral oils and greases. This product is supplied in a pack of 100 pcs.