DrillMore provide DTH drill bit designed according to your local rock condition, to ensure drilling safety and improve the drilling speed.  Our DTH Bit Size from 3" To 40", Bit Shank DHD/COP/QL/ SD/MISSION/NUMA/CIR/BR etc.

N4 115Middle-low Air Pressure DTH button bit, Shank Type: N125, 6 splines

CIR series N3-N4 drill bits

specifications		Head shape	Head dia(mm)	spline	Button Type	Gauge Buttons	Front buttons	weight(Kg)
	NUMA100	concave face	254	10	Domed	12X019	8X018+19X016	89.5
		concave face	275	10	Domed	13X019	8X018+20X016	99
		concave face	305	10	Domed	15X019	27X018+8X016	105.5
		concave face	325	10	Domed	15X019	27X018+9X016	112
		concave face	350	10	Domed	16X019	32X018+14X016	121
		concave face	400	10	Domed	16X019	40X018+25X016	146.5
	NUMA100A	concave face	254	10	Domed	12X019	8X018+19X016	89.5
		concave face	275	10	Domed	13X019	8X018+20X016	93
		concave face	305	10	Domed	15X019	27X018+8X016	112
		concave face	325	10	Domed	15X019	27X018+9X016	118
		concave face	350	10	Domed	16X019	32X018+14X016	121
		concave face	400	10	Domed	16X019	40X018+25X016	146.5
	N125	concave face	305	10	Domed	15X020	27X018+8X016	175.5
		concave face	311	10	Domed	15X020	27X018+8X016	185
		concave face	325	10	Domed	16X020	27X018+9X016	200
		concave face	350	10	Domed	16X020	32X018+13X016	213
		concave face	381	10	Domed	16X020	36X018+18X016	236.5
		concave face	400	10	Domed	16X020	40X018+20X016	265.5
		concave face	445	10	Domed	20X020	48X018+25X016	322
		concave face	500	10	Domed	24X020	90X018	398

How to find a suitable DTH bit? 

DrillMore DTH Drill Bit has a variety of carbide and face designsfor use in different ground conditions.

Spherical/round buttons are usually used as gauge buttons of DTH bits, suitable for very abrasive and very hard formations.	Parabolic buttons are usually used as gauge buttons and front buttons of DTH bits, suitable for medium abrasive and hard formations.	Ballistic buttons are usually used as front buttons of dth bits, suitable for medium abrasive and medium hard formations. They can also be used as gauge buttons if the rock is soft.	Sharp buttons are usually used as front buttons of DTH bits for soft formations, suitable for high rotation speed and low bit broken rate soft rock.	Flat buttons are usually used as protection buttons to reduce wear on rubbing surface of DTH bits.

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