High Pressure DTH Hammers

Superdrill DTH hammers are all simple structure, easy to assemble and disassemble, as well as reliable quality and long service life. Superdrill has various hammer models suitable to drill holes from 64mm to 1000 mm (2-1/2” ~ 39-3/8”) in diameter; and come with three kind: low pressure (5 ~ 7 bars), middle pressure (7 ~ 15 bar) and high pressure ­­(7~ 30 bars).

Superdrill  DTH hammers mainly be produced with shank type of DHD, QL, SF, COP, Mission, SD, BR, CIR and ACD series, Diameter ranging from 2” to 8” for mining and quarrying, and 6” to 32” for      water-well drilling, oil-well drilling and foundation and so on.

DTH Hammer Selection:

Choosing the right hammer is largely determined by drill machines (mainly compressor output), drilling hole size and type of rock formation. Ideally, the size of the hammer should match the required hole dimension as closely as possible, leaving just enough space for compressed air to flush cuttings and clean the hole.

The optimum range of hole size for blast-hole drilling with DTH method is 90~254 mm (3-1/2” ~ 10”) with 3.5 ~ 8” hammers. Smaller blast holes are generally drilled with top-hammer tools, while larger holes typically with rotary drilling tools. In other applications, like foundation drilling, DTH hammers can be used in hole size up to 1,000 mm (39-3/8”).

Usually, the smallest hole diameter a DTH hammer can drill is its nominal size, for example, a 4” hammer would drill a 4” (100/102 mm) hole. The limiting factor is the outside diameter of the hammer, because, as hole diameter reduces, airflow is restricted. Maximum hole size for production drilling is the nominal hammer size plus 1”for 5” and smaller hammers and plus 2 for 6” and bigger hammers, for example, for a 4” hammer the maximum hole size is 5” (127/130mm) while for a 8” hammer the maximum hole size is 10” (254mm).

High Pressure DTH Hammers:

Hammer Size	Shank Design	Working Pressure		Drilling Range
		Bar(0.1 MPa)	PSI (lb/in2)	mm	inch
2.5”	SPD2.5	10~15	150~220	76~90	3 ~ 3 1/2
3.5”	DHD3.5	10~15	150~220	90~115	3 1/2 ~ 4 1/2
	Mission30	10~24	150~350	90~105	3 1/2 ~ 4 1/8
4”	DHD340A	10~24	150~350	108~135	4 1/4 ~ 5 3/8
	Mission40	10~24	150~350	108~135	4 1/4 ~ 5 3/8
	SD4	10~24	150~350	110~135	4 3/8 ~ 5 3/8
	QL40	10~24	150~350	110~135	4 3/8 ~ 5 3/8
5”	DHD350R	10~25	150~360	127~155	5 ~ 6 1/8
	Mission50	10~25	150~360	135~155	5 1/4 ~ 6 1/8
	SD5	10~25	150~360	135~155	5 1/4 ~ 6 1/8
	QL50	10~25	150~360	135~155	5 1/4 ~ 6 1/8
6”	DHD360	10~25	150~360	152~254	6 ~ 10
	Mission60	13~25	190~360	152~254	6 ~ 10
	SD6	10~25	150~360	155~203	6 1/8 ~ 8
	QL60	15~25	220~360	155~203	6 1/8 ~ 8
	DHD360	18~30	260~440	175~216	6 7/8 ~ 8 1/2
8”	DHD380	10~30	150~440	195~305	7 3/4 ~ 12
	Mission80	10~25	150~360	195~305	7 3/4 ~ 12
	SD8	15~25	220~360	195~254	7 3/4 ~ 10
	QL80	18~30	260~440	195~254	7 3/4 ~ 10
	QL80	18~30	260~440	216~254	8 1/2 ~ 10
10”	SD10	15~30	220~440	240~311	9 1/2 ~ 12 1/4
	NUMA100	15~30	220~440	254~311	10 ~ 12 1/4
12”	DHD112	18~30	260~440	305~445	12 ~ 17 1/2
	SD12	18~30	260~440	311~445	12 1/4 ~ 17 1/2
	QL120	17~24	250~350	305~445	12 ~ 17 1/2
	NUMA120	18~35	260~510	305~445	12 ~ 17 1/2
	NUMA125	18~35	260~510	305~445	12 ~ 17 1/2