High Precision Cold Drawn Seamless Tube for Gas springs

Size Φ3.0mm-Φ160mm;Thickness 0.4mm-20.0mm
Material :#10, #20, #45
OD Tolerance:+/-0.03mm
ID Tolerance:+/-0.02mm
Thickness Tolerance:≤0.03mm
Straightness:≤0.08mm/m
Roughness:0.1ra-0.3ra
Condition:
1. BK (+C)No heat treatment after last cold forming process.
2. BKW (+LC) After last heat treatment there is a light finishing pass (cold drawing)
3. BKS (+SR) After the final cold forming process the tubes are stress relieve annealed.
4. GBK (+A) After the final cold forming process the tubes are annealed in a controlled atmosphere.
5. NBK (+N) After the final cold forming process the tubes are annealed above the upper 
Packing:
Woven bag / wooden or crate carton/ Bundle Packing/ Plain end or vanished as per customer's request.