Lastek 121

High efficiency electrode

Electrode for fillet welding and butt welding of construction steel at high travel speed. Because the deposit is twice as fast as with multilayer techniques with conventional rutile electrodes, the shrinking force that could lead to twisting or distortion is minimized. Long beautiful welding beads; slag easy to remove.

Efficiency: 160 %.

Specifications & Usage


Filling V-grooves and fillet welds.

Steel and cast steel with tensile strength up to 520 N/mm².


Weld with short or medium arc length.

Can be welded with dragging or weaving technique.

The electrode is kept slightly inclined in the direction of the weld.


Welding proces: Covered electrode (SMAW)
Material Type: Mild steel (unalloyed)
Welding positions: PA, PB, PC
Norm : EN ISO 2560-A
Classification: E 42 A RR 73
Norm: AWS A5.1
Classification: E 7024
Minimum packing: 5 kg in a cardboard box