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Hydraulic Line Tubes (HPL)

Hydraulic Line Tubes (HPL) from Salzgitter Mannesmann Precision (SMP) are a high quality Seamless Cold Drawn precision tube predominantly for use as pressure lines in hydraulically or pneumatically operated equipment though they can also be used for a wide range of other applications.

Size Range:

  • Outside Diameter: 4mm to 80mm
  • Wall thickness: 0.75mm to 12.50mm
  • Technical standards: EN 10305-4 (Previously DIN 2391 and DIN 1630)
  • Tolerances: According to table HPL Tubes
  • Steel grades: E235 (ST37.4) and E355 (ST52.4)
  • Delivery condition: +N (NBK) Normalised
  • Design of wall thickness: DIN 2413-1 Load case I, II or III

Cold Workability:

The final heat treatment gives HPL tubing good cold workability such as bending & flaring. When bending is performed, the associated reduction in wall thickness on the outer bend and out of roundness on the inner bend must be taken into consideration.


The tubes are weldable without preheating and post-weld heat in accordance with current procedures.

Corrosion protection:

All tubes are provided with corrosion protection:

HPL Tubes Black

  • 2mm di <6mm: internal and external surface is lubricated
  • di >6mm : internal and external surface phosphatized and lubricated or only lubricated

HPL Tubes Galvanised - Cr 6 free high performance passivation

Externally galvanised tubes with a Zinc coating of 8 to 12 micron and subsequently passivated or chromated, plus temporary corrosion protection (inhibitor containing mineral), resistance against white corrosion.

Other details as standard:

  • In fix lengths as required
  • Ends square cut, un-worked, tubes with OD < 8 mm resp. ID <= 4 mm also ends square cut, un-worked and sealed with plugs or caps
  • ID <= 6 mm internal and external surface lubricated ( only for non-pinched off ends )
  • ID >= 6 mm internal and external surface phosphated and lubricated resp. only lubricated ( only for non-pinched off ends )
  • Tubes with inside diameter <= 4 mm sealed with plastic caps
  • Tubes with inside diameter < 4 mm sealed with plastic plugs
  • Eddy current tested acc. to DIN EN 10246, Part 3, class E3H
  • Marking: continuously marked along a line parallel to the tube axis with manufacturer, steel grade, dimension ( OD and wall ) and test code
  • Mill Test Certificate 3.1. acc. DIN EN 10204:2005
  • Packed in seaworthy fumigated wooden boxes
hydraulic line tubes (HPL)
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