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12" Numa Down The Hole Numa120 DTH Button Drill Bits For Rock Drilling

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Changsha Sollroc Engineering Equipments Co., Ltd

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12" Numa Down The Hole Numa120 DTH Button Drill Bits For Rock Drilling

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Brand Name :	SOLLROC
Model Number :	Numa120 dth bits
Certification :	SGS
Supply Ability :	30000 sets per month
Delivery Time :	3-4 weeks

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12" Numa Down The Hole Numa120 DTH Button Drill Bits For Rock Drilling

12" Numa Down The Hole Numa120 DTH Button Drill Bits For Rock Drilling

Product specifications: Numa120 dth bits

For 12" hammer DTH bits shank	Bit Dia.		No Air Holes.	Gauge Buttons	Front Buttons	Weight (Kg)	Part No.
For 12" hammer DTH bits shank	mm	inch	No Air Holes.	Gauge Buttons	Front Buttons	Weight (Kg)	Part No.
DHD1120	305	12"	4	12×φ18	36×φ16	152.0	DHD1120-305
	311	12 1/4"	4	12×φ18	36×φ16	157.0	DHD1120-311
	330	13"	4	16×φ18	42×φ16	165.0	DHD1120-330
	356	14"	4	16×φ19	48×φ16	178.0	DHD1120-356
	381	15"	4	16×φ19	48×φ18	198.0	DHD1120-381
SD12	305	12"	4	12×φ18	36×φ16	156.0	SD12-305
	311	12 1/4"	4	12×φ18	36×φ16	168.0	SD12-311
	330	13"	4	16×φ18	42×φ16	180.0	SD12-330
	356	14"	4	16×φ19	48×φ16	191.0	SD12-356
	381	15"	4	16×φ19	48×φ18	200.0	SD12-381
NUMA120	305	12"	4	12×φ18	36×φ16	152.0	NUMA120-305
	311	12 1/4"	4	12×φ18	36×φ16	158.0	NUMA120-311
	330	13"	4	16×φ18	42×φ16	165.0	NUMA120-330
	356	14"	4	16×φ19	48×φ16	178.0	NUMA120-356
	381	15"	4	16×φ19	48×φ18	195.0	NUMA120-381
NUMA125	305	12"	4	12×φ18	36×φ16	170.0	NUMA125-305
	311	12 1/4"	4	12×φ18	36×φ16	173.0	NUMA125-311
	330	13"	4	16×φ18	42×φ16	182.0	NUMA125-330
	356	14"	4	16×φ19	48×φ16	191.0	NUMA125-356
	381	15"	4	16×φ19	48×φ18	200.0	NUMA125-381

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12" Numa Down The Hole Numa120 DTH Button Drill Bits For Rock Drilling

it face shape selection:
1. Drop Center Bit
For high penetration rates in soft to medium hard and fissured rock formations. Low to medium air pressures. Maximum hole deviation control.
2. Concave Face
The all-round application bit face specifically for medium hard and homogenerous rock formations. Good hole deviation control and good flushing capacity.
3. Convex Face
For high penetration rates in soft to medium-hard with low to medium air pressures. It is the most resistance to steel wash, and may reduce the load and wear on the gauge buttons, but poor hole deviation control.
4. Double Gauge Face
This kind of face shape is suitable for fast penetration rates in medium to hard rock formations. Designed for high air pressures and good resistance to steel wash step gauge bit.
5. Flat Face Bit
This kind of face shape is suitable for hard to very hard and abrasive rock formations in applications with high air pressures. Good penetration rates an resistance to steel wash.
Carbide button shape selection:
1. Domed/Round Button
2. Parabolic/Semi-Ballistic Buttons
3. Ballistic Button
4. Sharp Button
5. Flat Button

Shank style	Diameter in mm	Flushing holes No.	Gauge buttons	Face buttons	Approx.weight
NUMA120	305	4	12*18mm	36*16mm	152.0kg
	311	4	12*18mm	36*16mm	158.0kg
	330	4	16*18mm	42*16mm	165.0kg
	356	4	16*19mm	48*16mm	178.0kg
	381	4	16*19mm	48*18mm	195.0kg

We are a leading manufacturer of rock drilling tools, like DTH hammers and bits, DTH drill pipes, RC hammers and bits, tophammer button bits, coupling, cross bits, drill rods located in Changsha, Hunan, China.
We have rich experience in this field of DTH hammers and bits for 20 years.
Owing to high quality, professional serivce and competitive price, we have gotten good reputation from our customers from all over the world, such as France, Spain, Italy, South Africa, Iran, Malaysia, Australia ad etc.

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