Operating Conditions 

Pressure Up to 50 MPa
Speed Up to 10 m/s
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 and others, depending on temperature, seal and O-Ring material compatibility - see Materials for PWM.
Clearance The maximum permissible radial clearance Smax is shown in Installation Dimensions, as a function of the operating pressure and functional diameter.

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:


PWM in PS8WM

All round material for light to heavy hydraulic applications 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

For specific applications, all PTFE materials are available.

Other material combinations are listed in Materials for PWM.

Materials for PWM 

Installation Dimensions - Standard Recommendations 

Series No. Bore Diameter DN H9 Groove Diameter Groove Width
Standard Application Available Range d1 h9 L1 +0.2 / -0.0
PWM 8 - 14.9 8 - 140 DN - 4.9 2.20
PWM 15 - 39.9 12 - 140 DN - 7.5 3.20
PWM 40 - 79.9 15 - 320 DN - 11.0 4.20
PWM 80 - 132.9 40 - 400 DN - 15.5 6.30
PWM 133 - 329.9 80 - 700 DN - 21.0 8.10
Series No. Radius Radial Clearance Smax O-Ring Cross Section
r1 max 10 MPa 20 MPa 40 MPa d2
PWM 0.4 0.40 0.30 0.20 1.78
PWM 0.6 0.60 0.50 0.30 2.62
PWM 1.0 0.70 0.50 0.30 3.53
PWM 1.3 0.80 0.60 0.40 5.33
PWM 1.8 0.80 0.60 0.40 7.00

Ordering Guide

PWM complete with O-Ring, standard application:

Series PWM
Bore Diameter DN = 80.0 mm
TMK Part No. PWM0800081

PWM 0800 081 PS8WM N

   1        2       3         4        5

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

Installation Dimensions / TMK Part No.