Thread Round Extension Rods for Drill

Model NO.: BL Material: High Manganese Steel Condition: New Rod Type: Mf, Mm MOQ: 10PCS Specification: SGS, CE HS Code: 82071990 Usage: Ore Mining Type: Rotary Drilling Rig Model: T38 Weight: 15-50kg Trademark: R32, T38, T45, T51 Origin: Fujian, China
Product Description
For Extension Rod, there are two shapes, one is round type, another one is hexagonal type. All extension rod are threaded and made by hollow drill steels.
This hollow hole are usually named flushing hole, used for transmitting water or air during drilling. Two ends threads can be used for connecting couplings, shanks, couplings or bits. Typically two ends of extension rods are male, while sometime one end is male and another one is female, then we call it M/F rod. We need couplings to connect extension rods, while for M/F rods, because one end is female, so couplings are not necessary.
Specifications:

roduct Name	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

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.

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