4140 steel round bar loading 4140 steel round bar is one of our top sale items,and it’s been sold to South American,Europen& Diddle east area, Genrally diameter 16-400mm in stock,length:5500-8000mm. Condition :Nomalnized.QT,Anneal. https://www.aisi4140steel.com/wp-content/uploads/2021/03/4140-round-bar.mp4