Rod U-ring

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Technical data

U-RingProfileMaterialHardnessBarsTemperatureSpeed
RodCollarín VástagoPU / TPU92 / 93 SH A≤400 -40 to +105 ºC≤0,50 m/s

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rod U-Rings

Compact rod U-Rings have symmetrical lips and are generally used in single acting applications. Unlike standard rod U-rings design, this shape also has a lip on the inner face, which greatly improves sealing by reducing the thickness of the oil film and preventing contaminants from entering the system. Designed for small bore cylinders, the compact collar design generates a higher preload which is an advantage in lower pressures and long stroke cylinders. JIOrings offers a range of 130 standard sizes.

ADVANTAGES

  • High degree of sealing thanks to the secondary lip
  • Economical sealing solution
  • Simple housing design Low axial housing height
  • Almost total guarantee that no dirt and/or air enters the system
  • Good sealing performance even at low pressures

APPLICATIONS

Construction machinery, forklift trucks, injection molding machines, agricultural machinery, mobile hydraulics, standard cylinders, loading platforms and telescopic cylinders.

WORKING CONDITIONS

TPU92 / TPU94 

Media 

Mineral oils (DIN 51524) 

HFA & HFB 

HFC 

Temperature 

-40 °C to +105 °C 

+5 °C to +50 °C 

-30 °C to +40 °C 

Pressure 

≤400 Bar 

≤400 Bar 

≤400 Bar 

Speed

≤0,5 m/sn 

≤0,5 m/sn 

≤0,5 m/sn 

 

 TPU95 High performance 

Media

Mineral oils (DIN 51524) 

HFA & HFB 

HFC 

Temperature

-35 °C to +110 °C 

+10 °C to +50 °C 

-35 °C to +50 °C 

Pressure

≤400 Bar 

≤400 Bar 

≤400 Bar 

Speed

≤0,5 m/sn 

≤0,5 m/sn 

≤0,5 m/sn 

 

Roughness surface

  

Ra 

Rmax 

Dynamic surface

≤0,4 μm 

≤3,2 μm 

Groove base

≤1,6 μm 

≤10,0 μm 

Groove flanks

≤3,2 μm 

≤16,0 μm 

INSTALLATION

Easily assembled into closed grooves according to the minimum diameter values that are given in the below table. Open grooves or special assembly tools should be used for the values that are outside this table. It is very important that the assembly tools must be of soft material and have no sharp edges. Before installation the wiper must be oiled with system oil.

Minimum diametre values for closed type of grooves

(D-d)/2 (mm) 

7,7 

10 

12,5 

15 

D min (mm) 

25 

30 

40 

50 

80 

100 

105 

 

Maximum permissible gap PU/TPU

Sección 

Pressure (Bar) 

150 

250 

400 

≤5 

0,30 

0,20 

0,15 

>5 

0,35 

0,25 

0,20 


Note: The largest sealing gap value occurring on the non-pressurized side of the seal does have a vital importance for the function of the seal and in this respect it is quite important to use the S value lower than the above indicated numbers.

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