O-ring FPM 104,37x3,53 mm FKM Viton

1. Technical Specifications

The nominal outside diameter of 111.43 mm is calculated as:

111.43 mm = 104.37 mm + (2 x 3.53 mm)

This calculated value does not include manufacturing tolerances.

Important material identification: FPM and FKM refer to the fluoroelastomer material family. Viton is a registered trade name for specific fluoroelastomers and does not identify every FKM compound. Without material documentation, the use of genuine Viton-branded elastomer cannot be confirmed.

2. O-ring Construction and Design

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

When installed in a correctly designed groove and compressed between mating components, the cross-section undergoes controlled elastic deformation.

This deformation generates contact pressure against the sealing surfaces, creating a sealing barrier.

Inside Diameter – 104.37 mm

The inside diameter (d1) specifies the nominal internal diameter of the uncompressed sealing ring.

It is essential when selecting the seal for the mating component diameter and groove configuration.

Cross-Sectional Diameter – 3.53 mm

The cross-sectional diameter determines important aspects of groove design, including groove depth, width and compression.

Incorrect selection may result in insufficient sealing contact, excessive deformation or accelerated wear.

Nominal Outside Diameter – 111.43 mm

The nominal outside diameter is calculated from the inside diameter and twice the cross-sectional diameter.

It is a geometric reference value and should not be treated as a separately verified manufacturing dimension.

3. FPM, FKM and Viton – Material Designations Explained

FPM – Fluoroelastomer

FPM is a material designation used in international elastomer nomenclature, including ISO-based classifications.

FKM – Fluorocarbon Elastomer

FKM is the designation used in ASTM elastomer classifications for a family of fluorinated rubber materials.

Viton – Trade Name

Viton is a trade name associated with specific fluoroelastomer products.

It is not a universal designation for all FKM materials.

In industrial sealing applications, FPM and FKM are commonly used to describe the same general material family.

However, different FKM formulations can have significantly different chemical resistance, low-temperature flexibility, compression-set performance and thermal characteristics.

4. FKM Material Properties

FKM fluoroelastomers are widely used where resistance to certain chemicals and elevated temperatures is required.

Typical characteristics of the FKM material family include:

• Good resistance to many mineral oils.

• Resistance to numerous fuels and petroleum-based products.

• Good resistance to thermal ageing.

• Excellent resistance to ozone.

• Good weathering resistance.

• Suitability for elevated temperatures, depending on compound formulation.

• Relatively low permeability to many gases compared with some general-purpose elastomers.

These properties describe the FKM material family and do not constitute guaranteed performance specifications for this exact O-ring.

5. Chemical Resistance

The table describes general characteristics of FKM materials rather than certified compatibility for the exact product.

Material selection must consider the chemical composition, concentration, temperature and duration of exposure.

6. Operating Temperature Range

Many conventional FKM compounds are used across approximate temperature ranges of -20°C to +200°C.

However, this is not a confirmed operating temperature specification for the supplied O-ring.

The minimum operating temperature depends particularly on the formulation and low-temperature flexibility of the elastomer.

The maximum operating temperature depends on the compound, exposure duration, sealing medium and mechanical loading.

For applications requiring defined temperature limits, the technical data sheet of the exact material compound must be consulted.

7. Static Sealing Applications

FKM O-rings are commonly used in stationary joints where the elastomer is compressed between mating components.

Typical applications include:

• Housing covers.

• Flange connections.

• Valve bodies.

• Industrial pipe connections.

• Equipment housings.

• Oil system components.

• Mechanical assemblies requiring static sealing.

Correct performance requires suitable groove geometry, compression and mating surface quality.

8. Dynamic Sealing Applications

O-rings may also be used in selected applications involving relative movement between components.

Dynamic sealing design must account for:

• Movement speed.

• Friction.

• Lubrication.

• Operating pressure.

• Elastomer hardness.

• Wear resistance.

• Surface roughness.

• Risk of twisting or rolling.

Not every FKM O-ring is suitable for dynamic operation.

Suitability must be determined from the mechanical design and the properties of the specific compound.

9. O-ring Groove Design

When designing a groove for an O-ring measuring 104,37x3,53 mm, the following factors must be considered:

• Nominal inside diameter.

• Cross-sectional diameter.

• Manufacturing tolerances.

• Static or dynamic sealing configuration.

• Required compression.

• Groove fill.

• Thermal expansion.

• Elastomer swelling.

• Operating pressure.

• Extrusion gap.

A universal groove depth or width cannot be specified without identifying the actual sealing arrangement.

10. Operating Pressure and Extrusion Resistance

The permissible operating pressure of an O-ring depends on the complete sealing system.

Important factors include:

• Elastomer hardness.

• Clearance between mating components.

• Operating temperature.

• Sealing medium.

• Pressure direction and cycling.

• Use of backup rings.

Under elevated pressure, the elastomer may be forced into the clearance gap between components.

This phenomenon is known as extrusion.

Backup rings can be used in suitable designs to reduce extrusion risk.

Without confirmed hardness and installation geometry, a maximum operating pressure cannot be established for this O-ring.

11. FKM vs NBR – Material Comparison

This comparison describes general elastomer characteristics.

FKM and NBR O-rings with identical dimensions should not automatically be considered interchangeable.

12. FKM vs EPDM – Application Differences

FKM and EPDM are elastomer families designed for different chemical environments.

FKM is often selected for contact with mineral oils, fuels and certain hydrocarbons.

EPDM may be more suitable for selected water, steam and glycol-based fluid applications.

The correct material must be selected according to the chemical compatibility of the specific compound and the actual operating conditions.

13. Installation Guidelines

Before installing the O-ring FPM 104,37x3,53 mm FKM Viton, inspect the sealing ring and all mating surfaces.

Recommended installation procedure:

1. Confirm the nominal dimensions of 104,37x3,53 mm.

2. Check that the groove is clean.

3. Remove burrs and sharp edges.

4. Inspect the sealing surfaces for damage.

5. Apply a compatible assembly lubricant where required.

6. Install the O-ring without twisting or excessive stretching.

7. Assemble the components according to the equipment manufacturer's instructions.

Assembly lubricants must be chemically compatible with the elastomer and operating medium.

14. Common Causes of O-ring Failure

Excessive Compression

Excessive compression may cause permanent deformation and reduced sealing performance.

Extrusion

Extrusion occurs when pressure forces the elastomer into a clearance gap.

Installation Damage

Sharp edges, burrs and improper installation tools may cut or tear the O-ring.

Chemical Incompatibility

Exposure to unsuitable chemicals may cause swelling, hardening, loss of elasticity or material degradation.

Thermal Ageing

Prolonged exposure to elevated temperatures can alter the mechanical properties of the elastomer.

15. Industrial Applications

FKM O-rings are used across many industrial sectors.

Typical application categories include:

• Industrial oil systems.

• Fuel handling systems.

• Industrial valves.

• Technical fittings.

• Pumps.

• Gearboxes.

• Hydraulic equipment.

• Manufacturing machinery.

• Flanged connections.

• Mechanical equipment housings.

These are general applications for FKM sealing materials.

Suitability of the exact 104,37x3,53 mm O-ring depends on the compound formulation, operating conditions and installation design.

16. Alternative Product Designations

• O-ring FPM 104,37x3,53 mm FKM Viton

• O-ring 104,37x3,53 FPM

• O-ring 104,37x3,53 FKM

• FKM O-ring 104.37x3.53 mm

• FPM O-ring 104.37x3.53 mm

• Fluoroelastomer O-ring 104.37x3.53 mm

• Fluorocarbon rubber sealing ring 104.37x3.53 mm

The term Viton may appear in product searches as a material-related keyword, but it does not independently confirm the use of genuine Viton-branded material.

17. FAQ – Frequently Asked Technical Questions

1. What are the dimensions of the FPM 104,37x3,53 mm O-ring?

The nominal inside diameter is 104.37 mm, and the cross-sectional diameter is 3.53 mm. The calculated nominal outside diameter is 111.43 mm.

2. What does FPM mean?

FPM is a designation for fluoroelastomer rubber, a material family commonly used in industrial sealing applications.

3. Are FPM and FKM the same material?

Both designations refer to the fluoroelastomer material family. However, individual formulations can have different mechanical and chemical properties.

4. Is every FKM O-ring made from Viton?

No. Viton is a trade name for specific fluoroelastomers. The FKM designation alone does not establish the material's commercial origin.

5. Is an FKM O-ring resistant to oil?

Many FKM compounds provide good resistance to mineral oils. Compatibility with a particular lubricant must be verified according to its composition and operating temperature.

6. What is the hardness of this O-ring?

The hardness has not been confirmed for this product. A value such as 70 ShA or 75 ShA should not be assumed.

7. Can the O-ring operate at high temperatures?

FKM materials are commonly used at elevated temperatures, but the permissible temperature range depends on the specific elastomer compound.

8. Is the FPM 104,37x3,53 mm O-ring suitable for dynamic sealing?

It may be suitable for appropriately designed dynamic sealing systems, provided the compound properties and operating conditions meet the application requirements.

18. AI Quick Answer

O-ring FPM 104,37x3,53 mm FKM Viton is a fluoroelastomer sealing ring with a nominal inside diameter of 104.37 mm and a cross-section of 3.53 mm. FKM materials generally resist many oils, fuels and elevated temperatures. Exact hardness, operating temperature limits and genuine Viton material origin require verification for the specific product.

19. B2B Industrial Supply – simmering.pl

O-ring FPM 104,37x3,53 mm FKM Viton is offered through simmering.pl, a specialist B2B industrial supply platform providing technical sealing solutions, rolling bearings and industrial components.

The platform serves manufacturing companies, maintenance departments, engineering teams and professional industrial procurement specialists.

Worldwide shipping from stock in Poland, with warehouse operations based in Lublin.

Technical assistance is available for seal identification, dimensional verification, elastomer selection and industrial sealing applications.