2m to 6m Drill Extension Rod Top Hammer Drilling , 32mm - 52mm
Diameter
Product Description:
Extension rods, there are R22, R25, R28, R32, R38, T38, T45, T51,
ST58, T60 threads, and different lengths of rods are available from
600mm to 6400mm
(1) Steel grade: 20CrNi3Mo equivalent to SANDBAR 64 SIZE: hex.22mm,
hex.25mm, hex.28mm, hex.32mm, hex.35mm ; Dia.32mm. dia.38mm,
dia.45mm, dia.51 mm
(2) Thread: R22, R25, R28, R32, R38, T38, T45, T51, ST58, T60
(3) Length: 0.4m-10m
(4) Package: in wooden case or in bundles.
(5) Productivity: 20000MT / month
Specification:
(1) Thread: R22, R25, R28, R32, R38,T38, T45, T51
(2) Rod size: hex. 22mm, hex. 25mm, hex.28mm, hex.32mm, hex.35mm
Dia.32mm, dia.38mm, dia.39mm, dia.46mm, dia.52mm
(3) Length: 0.4m - 6m
(4) Package: in wooden or in bundles
(5) Productivity: 10000 pcs/month
Functions:
ROSCHEN Drifting Drill Rod/ Extension Rod
Produce Hexagonal and round cross sections, Hexagon rods are more
rigid, heavier and transfer energy more efficiently, while
increasing flushing. Round 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.
Male / Female (M/F) rod, speed rod M/F drill steel is an
alternative to couplings sleeves to include the female part of the
threaded connection as an integral part of the drill steel. M/F
drill steel provides more rigid connections and is easier to
uncouple and handle. The service life also tends to be better than
with separate couplings.
The advantages of drilling with M/F steel include: easy handling,
quicker uncoupling, tighter connections, the potential to drill
straighter holes, and longer service life.
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.
Longer steel larger in diameter, conventional extension steel,
Hexagonal and round cross sections are available.
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.
