ESAB OK Tubrodur 40 O M (formerly OK Tubrodur 15.42) is a self or CO2-shielded, flux-cored wire for GMAW hardfacing. It is designed for surfacing wheel runners, track links, billet rolls, wheels and rollers for conveyor belts, and wheels for mine trucks, rolls and shafts, where a hardness of 35-45 HRC is desired.