Extension Rod

Extension Drill Rod

Thread: R22, R25, R28, R32, R35, R38, T38, T45, T51;
Effective lengths:600mm ~ 6400mm;
Type：Thread extention Rod and MF rod
Body Type：Round shape and hexagonal type
Product description: Super drifting and extension drill rods are for in drifting, tunneling, long-hole drilling, bench and production drilling industries. These rods are produced with round or hexagonal sections in all co
INQUIRY Email Whatsapp

Extension Drill Rod

Extension rods are one major spare part in terms of drill application area, there are two shapes of extension rods, one is round type, another one is hexagonal type.

But all extension rods are threaded and made by hollow drill steels, this means usually extension rods are hollow.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:
Thread sizes: R22, R25, R28, R32, R35, R38, T38, T45, T51;

Rods diameter: round 32mm, round 39mm, round 46mm, round 52mm, Hex.22mm, Hex.25mm, Hex.28mm, Hex. 32mm, Hex. 35mm;
Effective lengths:600mm ~ 6400mm;

Extension Drill Rod

Rods Dimension	Length				Driven Thread	Suitable Bits Thread	Drilling Hole Range
	M-M		M-F				Drilling Hole Range
	mm	foot	mm	foot			mm	inch
Hex.25	915 ~ 3700	3 ~ 12	610 ~ 1220	2 ~ 4	R25, R28, R32	R25	33 ~ 51	1 19/64 ~ 2
Hex.28	2100 ~ 4920	6 3/4 ~ 16	1220 ~ 3050	4 ~ 10	R28, R32, R38	R28	37 ~ 51	1 29/64 ~ 2
Hex.32	2400 ~ 5530	7 7/8 ~ 18			R28, R32, R38, T38	R32	40 ~ 64	1 37/64 ~ 2 1/2
Round32	915 ~ 4310	3 ~ 14	915 ~ 4270	3 ~ 14	R32, R38, T38	R32	45 ~ 64	1 3/4 ~ 2 1/2
Hex.35	2670 ~ 6100	8 5/8 ~ 20	3700 ~ 6400	12 ~ 21	R32, R38, T38	R32	45 ~ 76	1 3/4 ~ 3
Round38	610 ~ 6095	2 ~ 20	610 ~ 6095	2 ~ 20	R38, T38, T45	T38, T45	57 ~ 89	2 1/4 ~ 3 1/2
Round45	1830 ~ 6095	6 ~ 20	1525 ~ 6095	5 ~ 20	T38, T45, T51	T45, T51	70 ~ 102	2 3/4 ~ 4
Round51	3050 ~ 6095	10 ~ 20	1525 ~ 6095	5 ~ 20	T45, T51	T45, T51	76 ~ 127	3 ~ 5