Double acting NBR energised Bronzze filled PTFE rod seal.

- Design -

Claron Composite Seals Style CS6 are designed as high pressure, low friction Single-acting Rod seals for use in heavy duty hydraulic and pneumatic cylinders.
Claron Composite Seals Style 741 and Style 751 are designed as high pressure, low friction Double-acting Rod seals using the same housing designs as Style CS6. (These styles must be used in conjunction with single acting wiper seals, as Style 931). The inclusion of radial grooves on the P.T.F.E. element, from 20mm diameter onwards allows rapid response to bi-directional pressure changes.
Claron Composite Seals Style 741 is specifically designed for minimum leakage and slow rotary applications.
Housing sizes and tolerances are identical to Style CS6.

- Materials -

Standard materials are Bronze filled P.T.F.E with a Nitrile O-Ring Energiser but both the outer sealing element and the energiser are available in a wide range of high performance materials to suit a variety of applications .The application parameters should be carefully considered prior to selecting suitable materials from the tables.
Consult Claron for further advice.

- Operating Range -

Temp. -54°C to 200°C (Dependent upon O-Ring Material used see Appendix)
Pressure upto 800 bar
Velocity upto 15m/s
These range parameters are maximum conditional values.
Optimum service conditions are affected by temperature, speed, pressure, surface finish and extrusion gaps. Refer to Seal selection Guide for further information.

- Operating Conditions -

Maximum Pressure

Temp. Range
Temp. Range
-30°C to 80°C
80°C to 120°C
400 Bar
350 Bar
These range perameters are Maximum simultaneous conditions.
Optimum service conditions are affected by temperature, speed, pressure, surface finish and extrusion gaps.

Diametrical Clearance F shown in the graph is calculated as the maximum permissible extrusion gap, allowing for movement due to side load, for various pressures and temperatures upto 80°C. The use of a suitably selected Claron bearing ring will effectively reduce the Radial clearance to a value nearer to F/2 thus increasing the pressure capability of the seal. The maximum seal extrusion gap should be calculated allowing for all tolerances, movement and cylinder expansion.
For pressures > 400 bar, the seal extrusion gap should be reduced by utilising smaller tolerances. e.g H8 for Cylinder bore, f8 for piston diameter.

- Range of Installation Dimensions -

The full range of diameters applicable to the "Standard", "Light" and "Heavy" Duty Sections are shown in the table below

- How to Order -

When ordering, prefix the size reference with the style required and use the suffix shown in the material application tables.
e.g. CS6 Standard section in Bronze filled material for 70mm Rod CS60700/B
CS6 Light duty section in Glass filled material for 70 mm Rod CS60700/1G
741 Heavy duty section in Carbon filled material for 70 mm Rod 741-0700/2C
For O-Ring energiser materials other than Nitrile, use suffix shown in material table.
e.g Flourocarbon material (FKM), CS60700/B/FKM.

- Housing -

For surface finish and recommended lead in chamfers refer the illustration below. For housing dimensions and machining tolerances refer to the table of recommended sizes and Tolerance Tables for value of tolerence symbols

- Fitting -

For the seal to function correctly, it is important that care be taken in fitting the seal within its housing. For details refer to Seal Installation.

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