Materials:
The telescopic cylinders are made of high thickness laminated tubing without welds:
ST. 52.2 DIN –2391 R=500-650 N/mm²  Rs=355 N/mm² MW 450 20 MnV 6 R=550-720 N/mm²  Rs=420 N/mm²
Base, eyes and heads in steel: Fe 510 R=450-630 N/mm².

Stages:
They are made in a single piece starting from the raw bar, without the assistance of welding, with special NC lathes in order always to maintain perfect concentricity; moreover, they allow a greater drive length and make the cylinder work to the end of the run at the maximum pressure.

Surfaces:
The external surfaces of the stages undergo an initial machining phase followed by a chroming treatment and a final polishing phase, achieving a degree of roughness of:
Ra <= 0.5 monitored at each cycle by means of a roughness meter.
Even during this phase of the production cycle each piece is checked by means of a roughness meter..

Seals:
Seals, scrapers and guide rings are bought in.
Max Pressure: 400 Kg/cm² (395 Bar)
Temperature: da -40 a 110 C°.
Speed: 0,5 m/s
Oil: mineral based hydraulic and lubricating oils.

Testing:
All the cylinders undergo a final operating test with hydraulic pressure equal to the technical specifications stated in the catalogue and/or required by customer.