Piston U-Ring Set P36

Single acting Piston U-Ring Set P36 has asymmetrical profile and shortened outer lip and fabric reinforcement on the dynamic sealing side and an active back-up ring for gap closing. Piston Seal set P36 can be installed in “back-to-back” position in double-acting piston design with pressure on both sides.

Low friction due to fabric reinforcement, wide operating temperature range, easy instalation in closed groove and material FPM in black or brown color are significiant advantages of this Set.

Earth moving equipment
Special hydraulic cylinders.
Truck tail lift
Industrial wehicles
Mobile hydraulics

Standard material
Material set code SN218 SF266
Material base NBR 80 Shore A FPM 80 Shore A
Fabric Cotton Cotton
Back-up ring Acetal resine (POM) PTFE compound

For very low temperature applications up to -60 C, or excellent medium-rubber compatybility in special applications a few materials are recommended and available on request

Pressure, Speed
Working pressure, P 40 Mpa
Running speed, v 0,5 m/s
Medium; Working Temperature
Material set code SN218 SF266
Hydraulic oils HL, HLP -30 to 100˚C -15 to +150˚C
HFA, HFB fluids +5 to +60˚C
HFC fluids -30 to +60˚C
HFD fluids -15 to +150˚C
Water +5 to +90˚C
Mineral greases -30 to +90˚C -15 to +150˚C
Max. permissible gap dimension, emax
Max pressure ØD ≤ 80 ØD > 80
16 Mpa 0,60 0,65
26 Mpa 0,50 0,55
32 Mpa 0,40 0,45
40 Mpa 0,35 0,40
Surface quality*
Surface roughness Ra Rmax
Sliding surfaces 0.05.. 0,3 μm ≤ 2,5 μm
Groove base ≤ 1,6 μm ≤ 6,3 μm
Groove flanks ≤ 3,0 μm ≤ 15 μm

*Contact area Mr = 50% to 90% at cutting depth c=Rz/2 and reference line Cref=0%