O-ring 3.17x1.78 mm FPM FKM FLUOR - Fluoroelastomer O-ring

O-ring 3.17x1.78 mm FPM FKM FLUOR - Fluoroelastomer O-ring

O-ring 3.17x1.78 mm FPM FKM FLUOR is a fluoroelastomer sealing ring with an inside diameter of 3.17 mm and a cross-section of 1.78 mm. FKM, also referred to as FPM and sometimes described commercially as FLUOR, belongs to the fluorocarbon elastomer family widely used in sealing technology for resistance to elevated temperatures, many oils, fuels, hydrocarbons, ozone and ageing.

Technical data - O-ring 3.17x1.78 mm FPM FKM

The FPM / FKM / FLUOR designation alone does not define the exact compound formulation, hardness, colour, material manufacturer, approvals or a single universal operating temperature range. These parameters should be confirmed for the specific compound where they are critical to the application.

What does O-ring 3.17x1.78 FPM / FKM / FLUOR mean?

The designation identifies the key product characteristics:

• O-ring - elastomeric sealing ring with a circular cross-section
• 3.17 mm - inside diameter
• 1.78 mm - cross-section diameter
• FPM - designation for fluorocarbon rubber commonly encountered in European technical terminology
• FKM - designation for the fluoroelastomer material family
• FLUOR - commercial or descriptive term indicating a fluorinated elastomer material

FKM and FPM are commonly encountered when identifying O-rings manufactured from fluorocarbon elastomers.

The term FLUOR alone does not define the exact elastomer compound or its complete technical properties.

FKM, FPM and Viton - what is the difference?

FKM is a generic designation for a family of fluoroelastomers.

FPM is a designation for fluorocarbon rubber widely encountered in European technical documentation and industrial trade.

Viton is a brand associated with specific fluoroelastomer materials belonging to the FKM family.

Therefore, an O-ring described as FKM or FPM should not automatically be identified as a specific Viton compound unless the material origin and formulation are confirmed by documentation.

Construction of the FKM 3.17x1.78 mm O-ring

The 3.17x1.78 mm O-ring is a closed elastomeric sealing ring with a round cross-section.

Its basic dimensions are:

• inside diameter: 3.17 mm
• cross-section diameter: 1.78 mm

The sealing effect is created by controlled compression of the O-ring cross-section between mating surfaces.

A standard O-ring does not have a sealing lip, metal case or garter spring.

Despite its simple geometry, correct sealing performance depends on proper selection of dimensions, material, hardness, groove geometry and operating conditions.

FPM / FKM fluoroelastomer properties

FKM belongs to the fluoroelastomer family widely used in industrial sealing technology.

Typical characteristics of many FKM compounds include:

• very good resistance to many oils
• very good resistance to many fuels
• resistance to numerous hydrocarbons
• very good resistance to ozone
• very good resistance to ageing
• very good weathering resistance
• suitability for elevated-temperature applications
• resistance to a broad range of chemical media

FKM is not universally resistant to every chemical substance.

Compatibility should be assessed with consideration of:

• exact FKM compound
• operating medium
• medium concentration
• temperature
• pressure
• duration of exposure
• static or dynamic operating conditions

Operating temperature of the FKM 3.17x1.78 mm O-ring

A single operating temperature range should not be assigned to this product solely on the basis of the FKM/FPM designation.

The FKM family contains many different fluoroelastomer compounds.

They can differ in:

• high-temperature resistance
• low-temperature flexibility
• chemical resistance
• hardness
• compression set

Where operating temperature is a critical parameter, the documentation for the specific FKM compound should be verified.

FKM 3.17x1.78 O-ring vs NBR 3.17x1.78 O-ring

An FKM 3.17x1.78 mm O-ring and an NBR 3.17x1.78 mm O-ring can have exactly the same dimensions, but this does not make them automatically interchangeable.

FKM is commonly selected for applications requiring resistance to elevated temperatures, many fuels, hydrocarbons, ozone and ageing.

NBR is widely used in sealing applications involving many mineral oils and lubricants.

The two elastomer families have different chemical and thermal characteristics. Changing from NBR to FKM, or from FKM to NBR, requires verification of the actual operating conditions.

FKM 3.17x1.78 O-ring vs EPDM 3.17x1.78 O-ring

FKM and EPDM belong to different elastomer families.

FKM is commonly selected for contact with many oils, fuels and hydrocarbons.

EPDM is widely used in applications involving water, ozone, weathering and selected chemical media.

Identical 3.17x1.78 mm dimensions do not mean that FKM and EPDM O-rings are automatically interchangeable.

Alternative designations and search references

Natural designation variants include:

• O-ring FPM 3.17x1.78
• O-ring FKM 3.17x1.78
• O-ring FPM 3.17x1.78 mm
• O-ring FKM 3.17x1.78 mm
• O-ring FLUOR 3.17x1.78
• FPM O-ring 3.17x1.78
• FKM O-ring 3.17x1.78
• O-ring 3.17x1.78 FKM
• O-ring 3.17x1.78 FPM
• fluorocarbon O-ring 3.17x1.78 mm
• fluoroelastomer O-ring 3.17x1.78 mm
• FKM seal 3.17x1.78 mm
• FKM sealing ring 3.17x1.78 mm

These are natural variants of the product dimensions, type and material designation. They are not confirmed OEM numbers or manufacturer-specific cross-reference numbers.

How to select an FKM 3.17x1.78 mm O-ring

Before ordering, verify:

• inside diameter: 3.17 mm
• cross-section: 1.78 mm
• required FPM / FKM material
• compound hardness
• operating medium
• operating temperature
• pressure
• groove design
• required compression
• extrusion clearance
• static or dynamic operation
• required material approvals

The 3.17x1.78 mm dimensions are only part of the product identification.

An O-ring with identical dimensions manufactured from NBR, EPDM, VMQ or another elastomer can have significantly different chemical, thermal and mechanical properties.

Typical applications of FKM O-rings

FKM O-rings are used as sealing elements in a wide range of industrial equipment and systems where the properties of the specific compound are compatible with the operating conditions.

Typical application areas include:

• hydraulic systems
• pneumatic systems
• pumps
• valves
• industrial fittings
• oil systems
• fuel systems
• industrial equipment
• production machinery
• process installations
• maintenance operations
• technical service

These are typical application areas for FKM O-rings as a product category.

They do not confirm that this specific 3.17x1.78 mm O-ring is intended for a particular machine, vehicle or OEM application.

Installation of the FKM 3.17x1.78 mm O-ring

Due to the relatively small dimensions of this O-ring, particular care should be taken during installation to prevent cutting, twisting or excessive stretching.

Before installation, carefully clean the groove and mating surfaces.

Avoid:

• cutting the O-ring
• damaging the elastomer surface
• contact with sharp edges
• excessive stretching
• twisting the ring
• pulling the O-ring over unprotected sharp threads
• contamination of the sealing surfaces

The O-ring should sit evenly in the groove without twisting.

If an assembly lubricant is used, verify its compatibility with both the FKM material and the operating medium.

FAQ - O-ring 3.17x1.78 FPM FKM FLUOR

What are the dimensions of the FKM 3.17x1.78 O-ring?

The O-ring has an inside diameter of 3.17 mm and a cross-section diameter of 1.78 mm. The complete dimensional designation is 3.17x1.78 mm.

What does FKM mean?

FKM identifies a family of fluoroelastomers used in sealing technology. Individual FKM compounds can have different chemical, thermal and mechanical properties.

What does FPM mean?

FPM is a designation used for fluorocarbon rubber and is commonly encountered in European technical terminology.

What does FLUOR mean in an O-ring description?

FLUOR is a descriptive or commercial term indicating a fluorinated elastomer material. It does not define the exact compound formulation or its complete technical specifications.

Are FKM and Viton exactly the same?

No. FKM is the generic designation for a family of fluoroelastomers, while Viton is a brand associated with specific materials belonging to this family. The FKM designation alone does not confirm a specific Viton compound.

Is the FKM 3.17x1.78 O-ring resistant to oil?

Many FKM compounds provide very good resistance to numerous oils. For a specific application, compatibility of the exact compound with the operating medium, temperature and other service conditions should be verified.

Is the FKM 3.17x1.78 O-ring resistant to fuel?

Many FKM materials provide very good resistance to numerous fuels and hydrocarbons. Exact compatibility depends on the fuel type, FKM compound and operating conditions.

What is the hardness of the 3.17x1.78 FPM/FKM O-ring?

The supplied designation does not specify hardness. A value such as 70 ShA, 75 ShA or 80 ShA should not be assigned without confirmation of the specific compound specification.

O-ring 3.17x1.78 FPM FKM FLUOR - key information

O-ring 3.17x1.78 mm FPM FKM FLUOR is a fluoroelastomer sealing ring with a 3.17 mm inside diameter and 1.78 mm cross-section. FKM is widely used for resistance to elevated temperatures, many oils, fuels, hydrocarbons, ozone and ageing. Correct selection requires consideration of the specific compound and actual operating conditions.

Availability from simmering.pl

O-ring 3.17x1.78 mm FPM FKM is available from simmering.pl for industrial customers, maintenance departments, technical services, distributors and B2B procurement.

simmering.pl specialises in supplying O-rings and technical sealing solutions in a wide range of dimensions and elastomer materials. Products are supplied from stock in Poland, with worldwide shipping available.