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Our standard stock includes cold drawn tubes, both SEAMLESS and WELDED, with machined ID according to tolerance H8 EN 20286 and roughness (Ra) below 0.4 micron (µm).
GENERAL FEATURES
Chemical and mechanical features are the same of the raw tube (see steels-table for cold drawn tubes suitable for honing), which is machined on ID. The dimensional tolerances are the same of the raw tube, except for the ID, which is according to H8.
NORMS3.
COLD DRAWN SEAMLESS TUBES EN 10305-1
COLD DRAWN WELDED TUBES EN 10305-2
DIMENSIONAL FEATURES OF THE ID EN 20286
TUBES SUITABLE FOR SHAFTS
APPLICATIONS
Itis used for cylinders on self-propelled cranes, hydraulic systems for lifts, tipping pistons and telescopic cylinders for automotive and hydraulic platforms. They can replace solid piston rods for pneumatic cylinders in order to reduce mass forces in high speed pistons.
NORMS
EN 10305-1
TOLERANCES AND SIZES
ID: standard stock material is according to EN 10305-1. In case of tubes suitable for telescopic cylinders, that can be supplied on request, the tolerance allowing the machining also on the ID has to be agreed at the time of the order.
W.T.: ± 10% with a minimum of ±0.1 mm
Max.W.T.- Min W.T.
ECCENTRICITY: _____________________ *100
Max.W.T.+ Min W.T.
STRAIGHTNESS:
for OD ≤ 260 mm
if ReH ≤ 500 Mpa 0.0015 L;
if ReH > 500 Mpa 0.002 L;
for OD >260 mm
if ReH ≤ 500 Mpa 0.0025 L;
if ReH > 500 Mpa 0.003 L;
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