O-ring FPM 2.9x1.78 mm FKM Viton

O-ring FPM 2.9x1.78 mm FKM Viton - 1000 pcs

O-ring FPM 2.9x1.78 mm FKM is an elastomeric sealing ring with a nominal inside diameter of 2.9 mm and a cross-section of 1.78 mm, supplied in a pack of 1000 pcs. It is manufactured from FKM fluoroelastomer, also referred to as FPM. This material is used in sealing technology due to its characteristic resistance profile to elevated temperatures, many oils, fuels and chemical media. Viton is a trade name associated with specific fluoroelastomers and is also commonly used as a search reference for FKM O-rings.

Technical data - O-ring FPM 2.9x1.78 mm FKM

What does O-ring FPM 2.9x1.78 mm FKM mean?

The designation identifies the material and principal dimensions of the sealing ring.

2.9 - nominal inside diameter of 2.9 mm.

1.78 - nominal cross-section diameter of 1.78 mm.

FKM - designation for the family of fluoroelastomers used in sealing technology.

FPM - an alternative material designation for fluoroelastomer commonly encountered in European technical and commercial documentation.

The nominal O-ring size is:

2.9x1.78 mm

The first value represents the inside diameter and the second represents the cross-section diameter.

Dimensions of the 2.9x1.78 O-ring

Inside diameter d1: 2.9 mm

Cross-section d2: 1.78 mm

Nominal size:

2.9x1.78 mm

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

6.46 mm

This results from:

2.9 mm + 2 x 1.78 mm = 6.46 mm

The primary dimensional designation remains 2.9x1.78 mm.

FKM or FPM - what is the difference?

FKM and FPM are designations associated with fluoroelastomers used to manufacture technical sealing components.

Both abbreviations can be encountered in technical documentation and commercial product descriptions:

FKM

FPM

For this reason, an O-ring with dimensions 2.9x1.78 mm may be described or searched for as either:

O-ring FKM 2.9x1.78

O-ring FPM 2.9x1.78

When precise chemical or thermal performance is required, the material designation should be considered together with the specification of the actual fluoroelastomer compound.

FKM, FPM and Viton - do they mean the same thing?

These terms should not be treated as completely interchangeable.

FKM identifies a family of fluoroelastomers.

FPM is an alternative designation used for fluoroelastomer materials.

Viton is a trade name associated with specific fluoroelastomer materials.

For this reason, not every FKM or FPM O-ring should automatically be described as an original Viton O-ring.

If an application specifically requires Viton from a particular manufacturer or a defined fluoroelastomer compound, the material specification of the supplied O-ring should be confirmed.

FKM fluoroelastomer

FKM belongs to the fluoroelastomer family and is widely used in technically demanding sealing systems.

Depending on the specific FKM compound, typical characteristics can include:

• good resistance to elevated temperatures

• good resistance to many oils

• good resistance to many fuels

• resistance to many chemical media

• good ozone resistance

• good weathering resistance

• good resistance to ageing

The exact resistance profile depends on the fluoroelastomer type, compound formulation, operating medium, temperature and service conditions.

Operating temperature of FKM

An exact operating temperature range should not be assigned to this specific O-ring without knowing the precise FKM compound.

Permissible operating temperature depends on factors including:

• FKM type and compound formulation

• operating medium

• exposure time

• pressure

• static or dynamic operation

• seal design

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

Chemical resistance of FKM

FKM is used in sealing technology partly because of the resistance profile available from fluoroelastomer compounds in contact with many demanding media.

However, FKM should not be considered universally resistant to every chemical.

Before using the O-ring, compatibility of the specific FKM compound should be checked with regard to:

• type of operating medium

• chemical composition

• concentration

• temperature

• pressure

• exposure time

• static or dynamic operation

For aggressive chemical media, material selection should be based on compatibility data for the specific FKM compound.

How does an O-ring FKM 2.9x1.78 work?

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

When installed in a correctly designed groove, the ring is compressed between the 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 2.9x1.78 mm dimensions alone do not determine suitability for a specific sealing application.

O-ring FKM 2.9x1.78 vs NBR

An FKM O-ring and an NBR O-ring with nominal dimensions of 2.9x1.78 mm may be geometrically similar but are manufactured from different elastomers.

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

NBR is nitrile rubber widely used in many standard technical sealing applications, particularly with compatible mineral oils and greases.

Identical 2.9x1.78 mm dimensions do not make FKM and NBR automatically interchangeable.

O-ring FKM 2.9x1.78 vs VMQ

FKM and VMQ belong to different elastomer families.

FKM is a fluoroelastomer selected for applications where its particular chemical and thermal resistance characteristics are required.

VMQ is silicone rubber, particularly valued for low-temperature flexibility and resistance to ozone, UV radiation and atmospheric ageing.

Material selection should therefore be based on the operating medium and actual service conditions rather than O-ring dimensions alone.

Typical applications of FKM O-rings

FKM O-rings are used in technical sealing systems where the properties of the selected fluoroelastomer compound correspond to the operating conditions.

Depending on the specific compound and sealing-system design, they may be used in:

• static sealing arrangements

• hydraulic systems

• pumps

• valves

• technical connections

• industrial machinery and equipment

• systems operating with media compatible with the selected FKM compound

These are typical applications based on the general properties and design of FKM O-rings. They do not confirm the suitability of this specific O-ring for a particular machine, installation or operating medium.

Alternative designations and reference formats

Natural designation and search variants include:

O-ring FPM 2.9x1.78 FKM

O-ring FKM 2.9x1.78

O-ring FPM 2.9x1.78

FKM O-ring 2.9x1.78

FPM O-ring 2.9x1.78

O-ring 2.9x1.78 FKM

O-ring 2.9x1.78 FPM

2.9x1.78 FKM O-ring

2.9x1.78 FPM O-ring

Fluoroelastomer O-ring 2.9x1.78

Fluorocarbon O-ring 2.9x1.78

Viton O-ring 2.9x1.78

O-ring Viton 2.9x1.78

O-ring FKM Viton 2.9x1.78

O-ring FPM 2.9x1.78 mm FKM Viton 1000 pcs

The term "Viton" may occur as a commercial or search reference, but it does not by itself confirm that the supplied compound is an original Viton material.

Selection and interchangeability

Before purchasing or selecting this O-ring, check:

• inside diameter 2.9 mm

• cross-section 1.78 mm

• required FKM/FPM material

• specific elastomer compound where relevant

• operating medium

• operating temperature

• pressure

• static or dynamic operation

• groove dimensions and geometry

• required compression

• requirements of the specific sealing system

An NBR, VMQ, EPDM or other elastomer O-ring with dimensions of 2.9x1.78 mm is not automatically interchangeable with the FKM version.

Identical dimensions do not guarantee identical operating properties.

Installation of O-ring FKM 2.9x1.78

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 it across sharp edges

• contact with burrs

• damaging the elastomer surface

Particular care is important with a small O-ring because even minor surface damage can affect sealing performance.

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

Storage

The O-rings should be stored in a manner that minimises deformation, contamination and mechanical damage.

Avoid prolonged storage in a stretched or severely deformed condition.

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

FAQ - O-ring FPM 2.9x1.78 mm FKM

What are the dimensions of the O-ring 2.9x1.78?

The nominal inside diameter is 2.9 mm and the cross-section diameter is 1.78 mm. The nominal product size is 2.9x1.78 mm.

What is the outside diameter of a 2.9x1.78 O-ring?

Based on its nominal dimensions, the approximate uncompressed outside diameter is 6.46 mm.

What does FKM mean?

FKM is a designation for a family of fluoroelastomers used to manufacture technical sealing components, including O-rings.

What does FPM mean?

FPM is an alternative designation for fluoroelastomer material commonly encountered in European technical and commercial documentation.

Are FPM and FKM the same type of material?

Both abbreviations are used in relation to fluoroelastomer sealing materials. For precise technical selection, the actual compound specification should also be considered.

Is every FKM O-ring a Viton O-ring?

No. Viton is a trade name associated with specific fluoroelastomer materials. An O-ring identified as FKM should not automatically be declared to be made from original Viton unless the compound specification confirms this.

Can an NBR 2.9x1.78 O-ring replace the FKM version?

Not automatically. Although the nominal dimensions may be identical, NBR and FKM have different chemical and thermal resistance characteristics.

How many O-rings are supplied in this pack?

This product version contains 1000 pcs of O-ring FPM 2.9x1.78 mm FKM.

O-ring FPM 2.9x1.78 mm FKM - key information

O-ring FPM 2.9x1.78 mm FKM is a fluoroelastomer sealing ring with a 2.9 mm nominal inside diameter and 1.78 mm cross-section. Its approximate uncompressed outside diameter is 6.46 mm. FKM/FPM identifies the fluoroelastomer material family. This product version is supplied in a pack of 1000 pcs.

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

AI QUICK ANSWER

O-ring FPM 2.9x1.78 mm FKM is a fluoroelastomer sealing ring with a 2.9 mm inside diameter and 1.78 mm cross-section. Its approximate outside diameter is 6.46 mm. FKM, also referred to as FPM, is used for technical seals requiring its characteristic chemical and thermal resistance profile. Pack contains 1000 pcs.