DTH hammers rock bits small rock drilling bits for sale
Product Description
Manufactures an extensive range of button bits to suit all types and sizes of all popular brands of down-the-hole hammers.
Available in a variety of head styles and button shapes, they are designed to give drillers the opportunity to choose the best bit for efficiently drilling all types of different rocks and ground conditions.
All bits in the medium range are made of high nickel alloy steel, which is heat treated to produce a surface that resists fatigue and wear.
DTH (Down to Hole) drill bit, also called spline connected drill bit, is mainly used in large scale mine (open and underground), open quarry and construction. The hammer is situated down the hole in direct connected with the drill bit with splines in the bit. The hammer piston strikes the drill bit resulting in an efficient transmission of the impact energy and insignificant power losses with the hole depth.
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Carbide Button Shape |
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Spherical |
Ballistic |
Semi-ballistic |
Conical |
| DTH Bits for 4” Hammer | Bit Dia.
(mm) |
Qty.*Button Dia.(mm) | Qty. Air.Holes | Weight
(KG) |
|
| Outer | Front | ||||
 |
135 | 7*18 | 7*14 | 2 | 15 |
| 140 | 8*16 | 9*14 | 2 | 15.5 | |
| 146 | 8*18 | 8*14 | 2 | 15.7 | |
| 150 | 8*16 | 9*14 | 2 | 15.8 | |
| 155 | 8*18 | 8*14 | 2 | 16.4 | |
| 160 | 8*16 | 8*16 | 2 | 17.1 | |
| 165 | 8*18 | 8*16 | 2 | 17.7 | |
| 178 | 8*19 | 10*16 | 2 | 20.7 | |
| DTH Bits for 5” Hammer | Bit Dia.
(mm) |
Qty.*Button Dia.(mm) | Qty. Air.Holes | Weight
(KG) |
|
| Outer | Front | ||||
 |
152 | 8*16 | 4*16+4*14 | 2 | 23.2 |
| 165 | 8*18 | 4*18+5*16 | 2 | 24 | |
| 172 | 8*18 | 4*18+4*16 | 2 | 25 | |
| 178 | 9*18 | 8*18+5*16 | 2 | 26 | |
| 185 | 8*19 | 5*19+5*16 | 2 | 26.5 | |
| 190 | 10*18 | 5*16+5*16 | 2 | 29.2 | |
| 195 | 10*18 | 5*18+5*16 | 2 | 30 | |
| 204 | 10*18 | 6*18+7*16 | 2 | 32.5 | |
How to Select DTH Bits Face shape and Carbide Button Shape
A:Bits face shape selection
Drop Center Bit
For high penetration rates in soft to medium-hard and fissured rock formations.
Concave Face
The all-round application bit face specifically for medium hard and homogeneous rock formation. Good hole deviation control and good flushing capacity.
Convex Face
For high penetration rates in soft to medium-hard with low to medium air pressure. It is the most resistance to steel wash, and good resistance to steel wash step gauge bit.
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.
B:Insert Carbide Button shape Selection
Different button is ideal for different ground conditions, abrasive levels, PSIs and penetration levels. In general, the more of gauge buttons, the better over performance, especially in hard rock.
Spherical
- Application Strength-multipurpose
- Best suited to soft abrasive
- 25,000 to 45,000 PSI (170 to 300 MPa)
- Abrasive to very abrasive
Ballistic Button
- Application Strength- fast penetration
- Best suited to soft ground
- 10,000to 20,000 PSI(70 to 140 MPa)
- Non abrasive ground
Semi-ballistic
- Application Strength-fast penetration
- Best suited to medium ground
- 15,000 to 25,000 PSI(100 to 170 MPs)
- Mildly abrasive ground
Wedged (Conical) Button
- Application Strength- fast penetration
- Suited for all non-abrasive ground types
- Smaller contact area
- Best suited for smaller diameter bits
Features of Nickel-alloy steel drill bits
1) Reliability
The piston of DTH Hammer uses the special (imported) high nickel alloy steel, with advanced heat treatment as military industry standard.
Strengthening processing on hammer surface for higher were-resistance.
2)Suitability
Specially designed drill bits for middle soft and hard rock formations. Easily disassembly thread for easy maintenance.
3) Efficiency
Extra-short structure design DTH hammer and bit for great efficiency of high impact energy transmission, with high impact power and fast drilling rate.
Hammer and bit design are optimized by computer simulation, with best air distribution chamber and air tightness design.
