Beyond extrusion
tolerances.
Cold drawing reduces extruded rod, bar, and tube through a precision die under tension. The result: tighter dimensional tolerances, improved surface finish, increased straightness, and a bright scale-free surface suitable for direct CNC machining without further preparation.
Rods, bars, and tubes.
Extrusion vs cold drawing.
| Parameter | Extruded | Cold drawn | Benefit |
|---|---|---|---|
| OD tolerance (25 mm dia.) | ±0.20 mm | ±0.05 mm | 4× improvement |
| Surface finish (Ra) | 1.5–3 μm | 0.4–0.8 μm | Scale-free, bright |
| Roundness (round bar) | ±0.15 mm | ±0.03 mm | Suitable for direct turning |
CNC machining blanks
Close-tolerance rod fed directly to turning centre. Eliminates pre-turn, reduces per-part cycle time and material waste.
Hydraulic cylinder rods
Consistent OD and straightness required for seal performance. Cold drawn rod to h9 tolerance, surface finish Ra 0.8 μm.
Precision structural
Structural pins, shafts, and axles requiring interference fit or close-clearance assembly. Cold drawn to h9.
Turned parts
Bright bar supplied to subcontract turning shops. Material certified and diameter verified.
Pneumatic components
Cylinder barrels and piston rods. Tube drawn to precise ID and OD for pneumatic seal housings.
Fasteners & hardware
Hexagonal bar for aluminium fastener manufacture: bolts, nuts, threaded rod. Close-tolerance hex for wrench engagement.