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Concave Face Diameter 216mm 8 1/2'' DTH Drill Bits

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Address: No55. Jiucaiyuan road, Furong District, Changsha, Hunan,China

Contact name:Ling Bo

Changsha Sollroc Engineering Equipments Co., Ltd

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Concave Face Diameter 216mm 8 1/2'' DTH Drill Bits

Country/Region	china
City & Province	changsha hunan

Product Details

Concave Face 216mm 8 1/2'' Black Color DTH Drill Bit For Mining

Product description

Penetraton rates with down-the-hole hammers are directly proportional to air pressure and, therefore, increasing the pressure will increase the drilling speed. Modern valveless hammers are products of precision engineering and are of a strong robustdesign with few internal parts making them economically attractive and easy to service. Air pressure is applied alternatively to both ends of the hammer piston by means of a system of ports and channels in the piston and cylinder to change the direction of the air. The valveless hammer operating cycle is described in the previous pages. DTH hammers are primarily percussion tools and penetrate more by shattering materials than by tearing it. The same air which passes through the hammer causing the piston to reciprocateand strike the bit also serves to expel cuttings from the bore hole and therefore maximumutilisation of the air is achieved.

SD8 216mm 8 1/2'' DTH Drill Bit overview

Bit Diameter	216mm 8 1/2''
No.* Button Dia. mm	Gauge Buttons 10*18mm
No.* Button Dia. mm	Front Buttons 818mm + 616mm
Weight (kg)	51.2

SD8 series DTH bit overview

Diameter		Button Configure Dia*qty.		Bit design	Weight (kg)
Metric	Inch	Guage button	Front button	Bit design	Weight (kg)
203mm	8''	18mm*10	18mm8+16mm5	Concave face	40.1
216mm	8 1/2''	18mm*10	18mm8+16mm6	Concave face	44.3
219mm	8 5/8''	18mm*10	18mm8+16mm6	Concave face	44.8
229mm	9''	18mm*12	16mm12+16mm7	Concave face	46.4
235mm	9 1/4''	18mm*12	16mm12+16mm7	Concave face	47.4
245mm	9 5/8''	19mm*12	16mm12+16mm8	Concave face	51.5

Product Advantages

1. 1. High grade tungsten carbide inserts

2. Bit bodies manufactured from high grade steel and processed using state-of-the-art CNC machinery and heat treatment

3.Multiple shank and face designs Various face and spline configurations

4.Perfect after-sales service. Free replacement is provided if there is quality problem with our products..

Face shape Features

Concave Face

1. Capable of drilling straighter holes in medium to hard rock which is broken or less consolidated

2. Offers high penetration rate in the above stated rock conditions

3. Has excellent air flushing characteristics

4. Predominant face style for majority of drilling conditions

Flat Face

1. Have a superior performance in hard, abrasive and broken rock conditions

2. They however have a slower penetration rate in comparison to a concave face bit

Convex Face

1. This face has been designed to offer high penetration rate in soft rock such as shale, limestone etc

2. They are recognized for having excellent capability for drilling into moderately consolidated rock conditions

Structure picture

Product application

At present, DTH drilling tool is widely used in underground mining, quarries, hydraulic and Hydro-Power Engineering, water well drilling, Mineral exploration, anchoring hole drilling, geothermal engineering, Subway excavation, another civil engineering.

DTH is one of the most efficient ways of drilling rock, using a rapid hammer action to break the rock into sizeable chips which are then evacuated from the bore hole by the air exhausted from the DTH Hammer. The technique provides fast drilling of accurately aligned, straight and clean holes in most ground conditions.