Description

Extension rods are generally lighter than hexagonal rods and are normally used in extension drilling applications.With the longer steel tending to be larger in diameter, conventional extension steel is characterized by a duplicate thread on each end of the steel.
For Extension Rod and M/F steel process, the below two different types of heat treatment are used to strengthen high speed and powerful percussive drill string components to maximize their performance and reliability. -    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.
 Length (mm)  Dia. (mm)  Thread weight（kg) Product No. ***0 Hex*5 R**-H**-R*5 4.*0 HDR******0 ***5 R**-H**-R*5 *0.*0 HDR******5 ***0 R**-H**-R*5 *2.*0 HDR******0 ***0 R**-H**-R*5 *4.*0 HDR******0 ***5 R*5 MF 5.*2 KHDR******5 ***0 R*5 MF ROD *2.*5 KHDR******0 ***0 Hex*8 R**-H**-R*8 9.*0 HDR******0 ***0 R**-H**-R*8 *5.*0 HDR******0 ***0 R*8 MF 6.*0 KHDR******0 ***0 R*8 MF *5.*0 KHDR******0