O-ring FKM 3x2 mm Viton

O-ring FKM 3x2 mm Viton

O-ring FKM 3x2 mm is a round-section sealing ring made from FKM/FPM fluoroelastomer, commonly searched for as a Viton O-ring. It has a 3 mm inside diameter and a 2 mm cross-section, giving a calculated outside diameter of approximately 7 mm. FKM is commonly selected for demanding sealing applications requiring increased chemical and temperature resistance compared with standard NBR.

Technical Data - O-ring FKM 3x2 mm

What Does 3x2 mm Mean?

The O-ring dimension:

3x2 mm

means:

ID: 3 mm

CS: 2 mm

The first value represents the inside diameter, while the second represents the cross-sectional diameter.

The approximate outside diameter can be calculated as:

OD = ID + 2 x CS

Therefore:

3 mm + 2 x 2 mm = 7 mm

The calculated outside diameter is approximately:

7 mm

FKM / FPM O-ring Material

This O-ring is manufactured from a fluoroelastomer identified as:

FKM / FPM

FKM is an internationally used designation for a family of fluorocarbon elastomers. FPM is another designation commonly encountered in European technical documentation.

These materials are widely used for sealing applications where greater resistance to temperature, oils, fuels and numerous chemical media is required compared with conventional NBR.

FKM and Viton - What Is the Difference?

The terms FKM, FPM and Viton are frequently used interchangeably in commercial searches, but technically they do not mean exactly the same thing.

FKM identifies a family of fluoroelastomers.

FPM is another designation used for fluoroelastomer materials, particularly in European terminology.

Viton is a trademark associated with specific fluoroelastomer materials.

Therefore, an O-ring manufactured from FKM should not automatically be described as being manufactured from an original Viton compound unless this is confirmed by the manufacturer.

For product searches, however, terms such as:

FKM O-ring

FPM O-ring

Viton O-ring

are commonly used by customers looking for this type of fluoroelastomer sealing ring.

Why Choose an FKM O-ring?

FKM fluoroelastomers are selected for demanding industrial sealing applications because they generally provide:

• good resistance to many mineral oils

• good resistance to many fuels

• resistance to numerous chemicals

• good ageing resistance

• good ozone resistance

• good weathering resistance

• higher temperature capability than standard NBR compounds

Actual compatibility depends on the specific FKM compound, medium, concentration, temperature, pressure and duration of exposure.

O-ring FKM 3x2 vs NBR 3x2

FKM and NBR O-rings can have exactly the same dimensions:

3x2 mm

but their material properties are different.

FKM / FPM

Generally selected for more demanding chemical and temperature conditions.

NBR

A widely used nitrile rubber offering good resistance to many mineral oils and greases and suitable for numerous general industrial sealing applications.

Material selection should therefore never be based on dimensions alone.

Chemical Resistance of FKM

FKM provides broad resistance to many industrial fluids, but no elastomer is universally compatible with every chemical.

Compatibility should be evaluated according to:

medium + concentration + temperature + pressure + exposure time + specific FKM compound

For critical applications, compatibility should be confirmed using technical resistance data for the actual compound being supplied.

Applications of O-ring FKM 3x2

A 3x2 mm FKM O-ring can be used in appropriately designed:

• hydraulic systems

• pneumatic systems

• pumps

• valves

• industrial fittings

• industrial machinery

• lubrication systems

• technical equipment

• systems handling compatible oils

• fuel-related systems

• applications requiring increased chemical resistance

• applications operating at elevated temperatures

Suitability must always be verified for the specific operating medium and conditions.

Static and Dynamic Sealing

O-rings can be used in both static and appropriately designed dynamic sealing arrangements.

Static sealing

The O-ring seals between components that do not continuously move relative to one another during normal operation.

Dynamic sealing

Relative movement occurs between the sealing surfaces.

Dynamic applications require particular attention to:

• surface finish

• lubrication

• groove geometry

• operating speed

• friction

• temperature

• pressure

• material compatibility

O-ring Groove Selection

Groove dimensions should not be determined solely from the 2 mm O-ring cross-section.

Correct groove geometry depends on whether the seal is:

• static or dynamic

• radial or axial

• internal or external

• pressure-loaded

• used in vacuum or other special operating conditions

Required O-ring compression, stretch and groove fill must also be considered.

How to Select an O-ring FKM 3x2

Before ordering, verify:

1. Inside diameter - 3 mm.

2. Cross-section - 2 mm.

3. Required material - FKM/FPM.

4. Operating medium.

5. Operating temperature.

6. Pressure.

7. Static or dynamic operation.

8. Groove dimensions.

9. Required chemical resistance.

Identical O-ring dimensions do not automatically mean identical sealing performance.

Installation of a 3x2 mm FKM O-ring

Before installation, inspect the groove and mating surfaces.

During assembly, the O-ring should not be:

• cut

• twisted

• excessively stretched

• dragged over unprotected sharp edges

• damaged by threads or burrs

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

Alternative Search Terms

This product may also be searched as:

• O-ring FKM 3x2

• O-ring FPM 3x2

• O-ring Viton 3x2

• Viton O-ring 3x2 mm

• FKM O-ring 3x2 mm

• FPM O-ring 3x2 mm

• fluoroelastomer O-ring 3x2

• fluorocarbon O-ring 3x2

• 3 mm ID O-ring

• 3x2 mm sealing ring

• 3x2 FKM seal

• 3x2 Viton seal

FAQ

What are the dimensions of the FKM 3x2 O-ring?

The O-ring has a 3 mm inside diameter and a 2 mm cross-section.

What is the outside diameter of a 3x2 O-ring?

The calculated outside diameter is approximately 7 mm.

What material is this O-ring made from?

It is made from FKM/FPM fluoroelastomer.

Are FKM and FPM the same type of material?

Both designations refer to fluoroelastomer materials, although they originate from different nomenclature systems.

Is FKM the same as Viton?

Viton is a trademark associated with fluoroelastomer materials. An FKM O-ring should not automatically be claimed to use an original Viton compound unless confirmed by the manufacturer.

Is FKM resistant to oil?

FKM provides good resistance to many oils. Compatibility should nevertheless be checked for the specific oil, temperature and operating conditions.

Is FKM more temperature-resistant than NBR?

In general, FKM fluoroelastomers are suitable for higher operating temperatures than standard NBR. An exact temperature range should not be specified without knowing the particular FKM compound.

Can a 3x2 FKM O-ring replace a 3x2 NBR O-ring?

Not automatically. Although their dimensions are identical, FKM and NBR have different chemical and temperature resistance characteristics.

Can this O-ring be used in hydraulic systems?

It can be suitable for appropriately designed hydraulic applications provided that the FKM compound is compatible with the hydraulic fluid and operating conditions.

O-ring FKM 3x2 mm - Quick Technical Answer

O-ring FKM 3x2 mm is a round-section fluoroelastomer sealing ring with a 3 mm inside diameter, 2 mm cross-section and calculated outside diameter of approximately 7 mm. FKM/FPM is used for demanding sealing applications requiring good resistance to many oils, fuels, chemicals, ageing and elevated temperatures compared with standard NBR.

O-ring FKM 3x2 at simmering.pl

O-ring FKM 3x2 mm is available from simmering.pl, a specialist B2B supplier of O-rings, rotary shaft seals, industrial seals and technical sealing solutions.

Stock and technical service are located in Lublin, Poland, with worldwide shipping available.