Precision tubes for mechanical machining – HPZ type

We offer a wide range of cylinder tubes for mechanical machining within the following parameters:

Dimensions of hydraulic cylinder tubes


INNER DIAMETER (OD)	40.0 - 115.0 mm
WALL THICKNESS (WT)	5.0 - 10.0 mm

Tube are destined to have the inside surface machined by honing or stripping and subsequent rolling

EN 10305-1; DIN 2391; STN / ČSN 42 6711, 42 6712;	See tube sizes acc. to European standards

Tolerances of hydraulic cylinder tubes

Tolerances of the outside diameter (OD) HPZ tubes meet the appropriate dimensional table standards. Tolerances values of the inside diameter (ID) are presented in the table. Tolerance of the wall thickness is -/+ 7.5% of the wall thickness. HPZ tubes eccentricity is included in the wall thickness tolerance

Steel grades for cylinder tubes


EN 10305-1 EN 10294-1	E355, 20MnV6, Marking system for steel grades according to EN

DIN 2391-2 DIN 17100	St 52 St 52-3

Chemical composition and mechanical properties of steels acc. to EN, DIN

Length of cylinder tubes


- manufactured length of precision tubes in the range of 3 to 6 meters - maximum precise length 6 meters

Cylinder tubes ends


The ends are vertical to the longitudinal axis and are without burrs. Upon agreement the tubes may be capped with plastic caps.

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Marking of cylinder tubes and tube bundles

The tubes are marked along the length of the tube where the following pieces of information are used: manufacturers’ logo, dimension (OD x ID), steel, heat number and the number of standard or other data as per the customers’ request. Bundles of tubes are marked with one or more labels with the required data

Packaging of the cylinder tubes

Tube are supplied in packages with a circular or hexagonal outline with maximum weight of 2 000 kg

(a) tubes bound with a steel band

(b) tubes wrapped in plastic sheets, burlap,

Cylinder tube testing


Selection of the tests is either according to standards or upon agreement with customer:			cast / chemical analysis

			tensile test,

			dimensional inspecti

			visual inspection

			NDT to find longitudinal defects

eddy current (STN 01 5054, PRP 02-74, SEP 1925, ASTM E 309, EN 10246-3 Gr.E3), stray flux (STN 01 5047, ČSN 01 5047, SEP 1913, ASTM E 570, EN 10246-5 Gr.F3), ultrasound (STN 01 5028, ČSN 01 5028, SEP 1915, ASTM E 213, EN 10246-7 Gr.U3),

Certified test reports for cylinder tubes


EN 10204	3.1 specific testing,

DIN 50049	3.1.B,

Straightness of cylinder tubes

Straightness of the tubes is 0,001 multiple of the tube length maximum, allowed straightness for one meter length is 1.0 milimeters.

Delivery condition of cylinder tubes

The tubes are delivered as cold drawn and annealed to relieve the stress BKS (+SR). Other delivery conditions are possible upon agreement. Marking for material condition according to DIN 2391-2 and ASTM 519 may be found here.