DTH Hammers & Bits II

DTH cluster drills consist of several smaller DTH hammers which are housed and driven in a circular steel barrel. The main advantage is that smaller and cheaper DTH hammers with less air consumption are combined to drill holes in hard rock up to 1830 mm diameter. Our DTH cluster drills and accessories can also be used for RCD (reverse circulation drilling).

RCD Cluster System
Model	Drilling O.D	Casing Size	Hammer Weight	Hammer Length	Drilling Speed in Hard Rock
	mm	mm	kg	mm	m/h
HTRC975	975	1016	5200	3100	2 - 3
HTRC1175	1175	1219	7500	3100	1 - 2
HTRC1340	1340	1500	8900	3100	1 - 2
HTRC1830	1830	2000	14000	3500	0.5 - 1

Our Overburden Drilling Systems are the optimum solution if temporary or permanent steel casings have to be installed by drilling in hard rock. Special extending and retracting drill bits undercut the wall thickness of the steel casing so that the casing can be easily sunken down to the required depth simultaneously with the drilling operation.

Overburden Drilling System
Axel Wing Model No.	Size	Bit Size		No. of Wings	Recommended Casing Size		Drive Shoe Inner Dia
Axel Wing Model No.	Size	Extended	Retracted	No. of Wings	Pipe O.D	Pipe Wall	Drive Shoe Inner Dia
	mm	mm	mm		mm	mm
No. 6	138	189	139.5	2	168.2	6.5	141.5
No. 6S	163	219.5	166	2	193.6	7.6	168
No. 8	188	253	188	3	219	7.6	190
No. 8S	213	279.2	217	3	254	6.4	219
No. 10	238	309.5	233	3	273	9.2	236
No. 10S	278	334	281	3	318.5	6.4	234
No. 12	318	372	319	3	355.6	9.5	323
No. 14	363	424	362	3	406.4	9.5	365
No. 16	408	477	410	3	457.2	11.1	414
No. 18	458	529	453	4	508	12.7	457
No. 20	508	580.5	505	4	558.8	12.7	507
No. 22	558	613.5	557.5	4	609.6	12.7	561.5
No. 24	608	684	604	4	660.4	12.7	609
No. 26	658	736	654	4	711.2	12.7	658
No. 28	708	78.5	706.5	4	762	12.7	710.5
No. 30	748	848.5	752	4	812.8	12.7	757
No. 32	808	885	808	4	863.6	12.7	813

We reserve the right to change technical specifications without prior notice.