Operating Conditions 

Speed Up to 15 m/s for PTFE materials
Temperature -45 °C to +200 °C. Depending on seal and O-Ring material
Media Mineral oil-based hydraulic fluids, flame retardant hydraulic fluids, environmentally friendly hydraulic fluids (bio-oils), phosphate ester, water, air and others, depending on the O-Ring material compatibility.

Important Note : The above data are maximum values and cannot be used at the same time, e.g. the maximum operating speed depends on material type, pressure, temperature and gap value. Temperature range also depends on media.



Recommended Materials 

The following material combinations have proven effective for hydraulic applications:


WE3 in PS8WM

All round material for light to medium hydraulic applications with linear, short stroke or helical movements in mineral oils, flame retardant hydraulic fluids, phosphate ester, bio-oils or fluids having low lubricating properties:

O-Ring NBR 70 Shore A N
FKM 70 Shore A V
Set Code PS8WMN or PS8WMV


WE3 in PS61B

For medium to heavy applications with linear movements in mineral oils and other media with good lubrication:

O-Ring NBR 70 Shore A N
FKM 70 Shore A V
Set Code PS61BN or PS61BV

For specific applications, all PTFE materials are available.

Other material combinations are listed in Materials for WE3.

Materials for WE3

Installation Dimensions - Standard Recommendations 

Series No. Rod Diameter dN f8/h9 Groove Diameter Groove Width
Standard Application Available Range D3 H9 L3 +0.2 / -0.0
WE3 4 - 11.9 4 - 130 dN + 4.8 3.7
WE3 12 - 64.9 10 - 245 dN + 6.8 5.0
WE3 65 - 250.9 25 - 400 dN + 8.8 6.0
WE3 251 - 420.9 40 - 655 dN + 12.2 8.4
Series No. Bore Diameter Step Width Radius O-Ring Cross Section
D4 H11 a min. r1 max. d2
WE3 dN + 1.5 2.0 0.4 1.78
WE3 dN + 1.5 2.0 0.8 2.62
WE3 dN + 1.5 3.0 1.0 3.53
WE3 dN + 2.0 4.0 1.5 5.33

Ordering Guide

WE3 complete with O-Ring, standard application:

Series WE3
Rod Diameter dN = 50.0 mm
TMK Part No. WE30500050

WE3 0500 050 PS8WM N

   1       2       3         4        5

1 TMK Series No.
2 Rod Diameter x 10
3 Groove Width x 10
4 Material Code ( Seal Ring )
5 Material Code ( O-Ring )

Installation Dimensions / TMK Part No.