Male/Female 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. This is fortunate because the coupling end cannot be replaced.
Roschen MF round extension rod with GT60 thread
GT60, the drill string components feature an entirely new thread design. Compared with T51 rods, the 40% larger rod cross-section of the GT60 rods provides 65% higher bending stiffness and withstands the Impact-waves from the piston much longer. So much so that both drill-rod and shank adapter life can be doubled. As an extra bonus, the more rigid drill string permits optimum drilling patterns and higher rates of penetration.
Compared with other drilling tool systems, GT60 system permits a wider hole range using the same rock drill. Have been specially developed for use with modern hydraulic top hammers and are available in a similar range to the standard Drill Rods. Plus GT60 Thread on 60mm Round material.
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.
Extension rod size:
R32-Round32-R32 length 3 4 6 8 10 12 ft
T38 (R38) Round39-T38 (38), length 4' 6' 10' 12'ft
T45 -Round46-T45, length 10' 12' 14' 20' ft
T51 -Round52-T51, length 12' 14' 20' ft
MF rod /speed rod size:
MF-rod R32-Round32-R32, length 3 4 5 6 10 12 14 ft
MF Rod T38-Round39-T38, length 4 5 6 10 12 14 ft
MF Rod T45-Round46-T45, length 5 6 10 12 14 20 ft
MF Rod T51-Round52-T51, length 6 12 14 20 ft
MF Rod ST58-Round60-ST58, length 12 14 20 ft
(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
(3) Length: 0.4m-10m
(4) Package: In wooden case or in bundles.
(5) Productivity: 20000MT / month
| Description |
Size |
Specification |
Length |
| R25 Rod |
Hex25 |
R25-Hex25-R25 |
610mm, 915mm, 1220mm, 1525mm,1830mm,2435mm, 3050mm, 3660mm |
| R32-Hex25-R25 |
1830mm,2130mm,2475mm,2795mm,3090mm,3700mm |
| Hex28 |
R32-Hex28-R25 |
3090mm, 3700mm |
| R38-Hex28-R25 |
| R28 Rod |
Hex28 |
R32-Hex28-R28 |
2475mm,2590mm,3090mm,3700mm,4005mm,4305mm |
| R38-Hex28-R28 |
3090mm, 3700mm,4305mm |
| R32 Rod |
Hex32 |
R32-Hex32-R32 |
2475mm,3090mm,3700mm,4305mm |
| R38-Hex32-R32 |
2475mm, 3090mm,3700mm, 4005mm,4305mm, 4610mm,4915mm |
| T38-Hex32-R32 |
4305mm |
| Hex35 |
R38-Hex35-R32 |
3090mm,3700mm,4305mm,4915mm,5525mm |
| T38-Hex35-R32 |
3090mm,3700mm,4305mm,4915mm,5525mm,6135mm |
| T38-Hex35-R32 MF-rod |
3090mm,3700mm,4305mm,4915mm,5525mm,6140mm |
| RD39 |
R38-RD39-R32 |
4305mm |
| T38-RD39-R32 |
4305mm,4915mm,5525mm,6135mm |
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