Operating Conditions 

RGM is recommended for linear (with a length of stroke at least twice the groove width) and helical movements.

Pressure Up to 60 MPa
Speed Up to 15 m/s
Frequency Up to 5 Hz.
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 seal and O-Ring material compatibility.
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:


RGM in PS8WM

All round material for light to heavy hydraulic applications with linear 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


RGM in PS61B

For media 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 RGM.

Materials for RGM 

Installation Dimensions - Standard Recommendations 

Series No. Rod Diameter dN f8/h9 Groove Diameter Groove Width
Series No. RG 43 Standard Application Series No. RG 45 Light Application Series No. RG 41 Heavy Duty Application D1 H9 L1 +0.2
RGM 3 - 7.9 8 - 18.9 - dN + 4.9 2.2
RGM 8 - 18.9 19 - 37.9 3 - 7.9 dN + 7.3 3.2
RGM 19 - 37.9 38 - 199.9 8 - 18.9 dN + 10.7 4.2
RGM 38 - 199.9 200 - 255.9 19 - 37.9 dN + 15.1 6.3
RGM 200 - 255.9 256 - 649.9 38 - 199.9 dN + 20.5 8.1
Series No. Radius Radial Clearance Smax O-Ring Cross Section
r1 max 10 MPa 20 MPa 40 MPa d2
RGM 0.4 0.30 0.20 0.15 1.78
RGM 0.6 0.40 0.25 0.15 2.62
RGM 1.0 0.40 0.25 0.20 3.53
RGM 1.3 0.50 0.30 0.20 5.33
RGM 1.8 0.60 0.35 0.25 7.00

Ordering Guide

RGM complete with O-Ring, standard application:

Series RGM
Rod Diameter dN = 80.0 mm
TMK Part No. RGM0800063

RGM 0800 063 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.