The reverse circulation hammer is used to collect underground rock and mineral samples quickly and efficiently using a pneumatic rotary drill. This hammer offers high speed and low cost per meter drilling. This type of drilling is considered ideal for obtaining mineral samples in the early phases of an exploration project. As all the rock cuttings in an RC hammer are recovered at the surface through the centre of the hammer and drill string, the samples collected through this method are uncontaminated. This hammer has also been designed to handle injection of water, foam, oil and polymers without any performance loss.

As all the rock cuttings in an RC hammer are recovered at the surface through the centre of the hammer and drill string, the samples collected through this method are uncontaminated. This hammer has also been designed to handle injection of water, foam, oil and polymers without any performance loss.

specifications

Hammer	BD351	RC3.5	BD004			BD542			BD543		BD545		BD040				BD52		BD54		A67
Top sub thread	R3″	R3″	R3.5″	R4″	M4″	R3.5″	R4″	M4″	R4″	M4″	M4.5″	R4.5″	M4″	R4″	M4.5″	R4.5″	M4.5″	R4.5″	M4.5″	R4.5″	M4.5″
Package case size, mm	(L)1100 (W)110 (H)120	(L)1230 (W)120 (H)150	(L)1300 (W)150 (H)180			(L)1230 (W)140 (H)170					(L)1260 (W)150 (H)180		(L)1300 (W)150 (H)180				(L)1300 (W)160 (H)190		(L)1300 (W)160 (H)190		(L)1330 (W)160 (H)190
Recommended bit size, mm	86-100	100-110	111-125			113-133					123-140		127-140				133-143		136-146		136-146
Bit shank	RE351	RC3.5	RE004			RE542			RE543		RE545		RE040				PR52		PR54		BD67
External diameter, mm	81	94	107			109.5			116		117.5		121				120.5		130		132
Length excl. thread, mm (Less bit)	1069	1184	1252			1191					1261		1210				1227		1294		1200
Hammer weight, kg (Less bit)	29	44	52			57			63		65		53.8	47.5	69.4	69.4	68.5		84.5		81.8
Piston weight, kg	4.8	8.3	10.5			11.6			11.6		13.5		13.6				14.3		17		17
Wrench flat, mm	No Wrench Flat	(L)82 (W)40	(L)90 (W)45	(L)90 (W)45	(L)90 (W)45	(L)95 (W)45	(L)95 (W)45	(L)95 (W)50	(L)95 (W)45	(L)95 (W)50	(L)102 (W)50	(L)102 (W)50	(L)94 (W)50	(L)94 (W)50	(L)94 (W)50	(L)94 (W)50	(L)94 (W)50	(L)94 (W)50	(L)100 (W)50	(L)100 (W)50	(L)95 (W)51
Drilling conditions and project specifications may require larger air packages to be used