Extension rod,Other names are Extension drill steel, Extension drill rod, and Extension steel, M/F rod ( Speedrod ).
(1)Hexagon rods are more rigid, heavier and transfer energy more efficiently, while increasing flushing;
(2)Round rods are generally lighter than hexagonal rods and are normally used in extension drilling applications.
(3)For Extension Rod and M/F steel process, the below two different types of heat treatment
– Carburization is a process used to harden the entire rod surface both internally and externally to strengthen and extend the life of the rod.
– High Frequency Induction is a process where only the thread ends of the rod are hardened to lengthen thread life.
Threaded:R32,T38,T45, T51 …
Length: 1220mm, 3050mm,3660mm…
threaded MF rods
Top hammer drill rods MM MF
