O-ring FPM 510x6 Viton FKM

O-ring FPM 510x6 Viton FKM

O-ring FPM 510x6 Viton FKM is an elastomeric sealing ring with a nominal inside diameter of 510 mm and a cross-section of 6 mm. It is made from FKM fluoroelastomer, also referred to as FPM. FKM is widely used in sealing technology where resistance to many oils, fuels, lubricants and hydrocarbons is required, as well as in applications involving elevated temperatures, depending on the specific compound.

Technical data

What does O-ring size 510x6 mean?

The designation 510x6 mm defines the two primary dimensions:

• 510 mm - nominal inside diameter ID
• 6 mm - cross-section CS

The 510 mm dimension does not refer to the outside diameter.

Based on nominal geometry, the approximate outside diameter is:

510 mm + 2 x 6 mm = 522 mm

For identification and ordering, the primary size remains 510x6 mm, meaning inside diameter x cross-section.

FKM, FPM and Viton - what is the difference?

FKM is the widely used ASTM designation for a family of fluoroelastomers. FPM is a designation commonly encountered in DIN/ISO terminology.

Viton is a trademark for fluoroelastomer materials owned by Chemours. Therefore, not every FKM/FPM O-ring is automatically made from genuine Viton material.

If genuine Viton material has not been confirmed by the manufacturer, the technically precise designation is O-ring FKM/FPM 510x6 mm.

FKM/FPM material properties

FKM fluoroelastomers are widely used for sealing applications involving many:

• mineral oils
• fuels
• lubricants and greases
• hydrocarbons
• chemical media compatible with the specific FKM compound

FKM is also commonly selected where operating temperatures or chemical conditions exceed the capabilities of a suitable standard NBR compound.

However, the exact chemical resistance and permissible operating temperature depend on the specific FKM formulation, medium and operating conditions.

FKM vs NBR O-rings

FKM and NBR O-rings may both be available in the same 510x6 mm size, but they have different material properties.

NBR is widely used in many standard sealing applications involving mineral oils and greases. FKM is commonly selected when greater resistance to temperature, fuels, hydrocarbons or specific chemical media is required.

Identical dimensions do not make FKM and NBR O-rings automatically interchangeable.

How to select an O-ring FKM 510x6

Before ordering, verify:

• inside diameter: 510 mm
• cross-section: 6 mm
• material: FKM/FPM
• required hardness
• operating medium
• operating temperature
• pressure
• groove dimensions and geometry
• static or dynamic sealing conditions

For a large-diameter O-ring such as 510x6 mm, correct positioning around the entire circumference and compatibility between the actual O-ring tolerances and groove geometry are particularly important.

Installation of O-ring 510x6

The groove and mating surfaces should be clean before installation. The O-ring should be positioned evenly around its entire circumference.

Avoid twisting the ring, excessive local stretching, contact with sharp edges, cuts or scratches, and uneven positioning in the groove.

Because of the large 510 mm inside diameter, it is advisable to check the position of the O-ring around the complete circumference before final assembly.

Alternative designations and search references

This product may also be searched as:

• O-ring FPM 510x6
• O-ring FKM 510x6
• O-ring 510x6 FKM
• O-ring 510x6 FPM
• FKM O-ring 510x6 mm
• FPM O-ring 510x6 mm
• Viton O-ring 510x6
• O-ring 510 x 6 FKM

The term Viton should identify the material only when the use of genuine Viton fluoroelastomer has been confirmed.

FAQ

What are the dimensions of O-ring FKM 510x6?

The nominal inside diameter is 510 mm and the cross-section is 6 mm.

What is the outside diameter of a 510x6 O-ring?

Based on nominal geometry, the approximate outside diameter is 522 mm.

Are FKM and FPM the same type of material?

Both designations refer to the fluoroelastomer family. FKM is widely used in ASTM terminology, while FPM is encountered in DIN/ISO terminology.

Is FKM the same as Viton?

Not necessarily. FKM describes a family of fluoroelastomers, while Viton is a Chemours trademark. Genuine Viton material should be confirmed by the manufacturer or product documentation.

Can an FKM 510x6 O-ring be replaced with an NBR 510x6 O-ring?

Not automatically. Although the nominal dimensions are identical, FKM and NBR have different material properties and resistance to temperature and operating media.

Is FKM suitable for oils?

FKM is compatible with many oils and lubricants, but compatibility of the specific compound with the actual medium and operating temperature should always be verified.

Do all FKM O-rings have the same temperature range?

No. The permissible temperature range depends on the specific FKM compound, operating medium, exposure time and application conditions.

O-ring FPM 510x6 FKM - key information

O-ring 510x6 FKM/FPM is a fluoroelastomer sealing ring with a nominal inside diameter of 510 mm and a 6 mm cross-section. Correct selection requires consideration of material, hardness, operating medium, temperature, pressure and groove geometry. Viton is a Chemours trademark and should not automatically be used as a synonym for every FKM material.