GM Series DTH Drill Bit

DTH bits (also called DTH bits or spline connection bit) is connected through the drill bit spline and impactor, for impact orientation and rotation of a transmission, braze the broken rock. Mainly used in large mines (open pit and underground mining), open architecture, and a large stone mining engineering construction conditions.

Technical Data of GM Series DTH Drill Bit(High Air Pressure)

Diameter		No x Buttons Diameter(mm)		Button Angle	Air Holes	Weight (kg)
mm	inch	Gauge Buttons	Front Buttons	Button Angle	Air Holes	Weight (kg)
Drill Bits for GM40 Hammers
105	4 1/8	7x16	6x14	38	2	6.0
110	4 5/16	7x16	6x14	38	2	6.2
115	4 1/2	7x16	6x14	38	2	6.6
120	4 3/4	8x16	8x13	38	2	7.0
125	4 15/16	8x16	10x13	38	2	7.4
130	5 1/8	8x16	8x14	38	2	8.0
Drill Bits for GM50 Hammers
138	5 1/2	7x18	7x15	38	2	13.0
146	5 3/4	7x18	7x15	38	2	14.0
152	6	7x18	8x15	38	2	14.4
165	6 1/2	7x18	8x16	38	2	15.6
178	7	7x18	10x16	38	2	18.2
185	7 1/4	7x18	10x16	38	2	24.0
Drill Bits for GM60 Hammers
152	6	8x18	4x16 +4x14	38	2	22.0
165	6 1/2	8x18	8x16	38	2	23.0
178	7	8x18	10x16	38	2	24.0
185	7 1/4	8x18	10x16	38	2	25.0
194	7 1/2	10x18	13x16	38	2	26.0
203	8	10x18	8x18 +6x16	38	2	28.0
216	8 1/2	10x18	8x18 +6x16	38	2	47.0
235	8 1/4	12x18	30x16	38	2	55.0
254	10	12x18	12x18 +8x16	38	2	63.0
Drill Bits for GM80 Hammers
203	8	10x18	8x18 +6x16	38	2	35.0
216	8 1/2	10x18	8x18 +6x16	38	2	40.0
235	9 1/4	12x18	30x16	38	2	50.0
254	10	12x18	12x18 +8x16	38	2	57.0
275	11	12x18	12x18 +9x16	38	2	68.0
305	12	12x18	12x18 +9x16	38	2	77.0