- EN 10305-1

 - EN 10305-4

 - EN ISO 286-2

TMK HYDRA ART identification        

TMK Hydra  ArtH xxx  OD x ID / TMK Hydra  ArtH xxx  OD x ID –IFR

TMK Hydra is the TMK-Artrom classification of Cold drawn inside skived and roller burnished (SRB) tubes.

Art H xxx is the grade identification, xxx being the minimum granted yield point in Mpa.

OD, ID are outside and inside diameters nominal values. 

Size program according Table 1 (Intermediate sizes can be produced subject of agreement before ordering). 

 - Outside Diameter (OD) in accordance with EN 10305-1

  - Inside Diameter (ID) in accordance with ISO H8 – EN ISO 286-2, Ra – 0.3 µm or better (please see Table 1).

Note: On request, OD can be supplied only on agreed positive tolerances suitable for future machining (for example for telescopic cylinders). For such purpose the tubes can be pre-machined using a center-less grinding process, the final OD value and OD variation being necessary to be agreed.

 - Max 0.5 mm/1000 mm

 - Total deviation for tubes with length 6 m: max. 3.5 mm/length.

 - Total deviation for tubes with length > 6 m: for each meter over 6 m the tolerance must be increased by 0.5 mm.

-   OD and ID roundness deviation shall be within the limits of the OD and ID tolerances.

 - Eccentricity shall be maximum 5%.

 - Eccentricity calculated by formula: 

Where Wt max, Wt min are maximum and minimum measured wall thickness in same cross-section.

 - Square cut to the longitudinal axis of the tubes with a slight bevel on outside surface.

 - Protected with plastic caps.

-  Minimum and maximum manufacturing lengths according to Table 1. Usually, the tubes shall be supplied in random lengths within 2 m variation.

 - As an option fix lengths  or multiple of fix length are available with cutting tolerance of -0/100 mm as well as cut to length pieces in range 0.4 - 4 m, cutting tolerance of -0/+3 mm.