Description
In addition to the choice of tunsten carbide button grade, how to
choose the drill bit design is very important for the drilling work
efficiency, also it will have a direct impact on the hole effect &
vertical degree. Combined with our production and sales experience,
we have summarized some of the following lessons for reference
only:
How to choose the bit tooth type:
Spherical buttons: The height of exposed teeth is low, mainly used in the very hard
rock formation above F14, to improve wear resistance, to prevent
the situation of debris, it should take lower drilling speed.
Ballistic buttons: It can expose more height of buttons, mainly used in soft rock and
ordinary rock below F12, with quicker drilling speed, but
encountered hard rock, very easily to happen buttons debris
phenomenon.
Color: Green,Blue or Based on Customer requirements
R38 2.5 Inch Stone Drill Bits CNC Milling Retractable Rock Drill
Bit
Material: Tungsten carbide and high strength alloy steel
Processing: CNC milling and proprietary heat treatment process
Type: R38 Retrac Button Bit Spherical Buttons
Applications
• Underground mining
• Tunneling
Advantage
1.High penetration rate for productivity.
2.Extended service life and lower drilling cost.
3.Excellent straightnesss and hole clean quality.
Specification
| Part Number | Bit Diameter (mm) | Bit Diameter (inch) | Front Buttons (No. x mm) | Gauge Buttons (No. x mm) |
| 4148300665 | 64 | 2 1/2 | 3x10, 1x10 | 6x11 |
| 4148300666 | 70 | 2 3/4 | 4x10, 1x10 | 8x11 |
| 4148300667 | 76 | 3 | 4x11, 1x11 | 8x11 |
| 4148300668 | 76 | 3 | 4x11, 1x11 | 8x12 |
| 4148300669 | 89 | 3 1/2 | 5x12 | 8x12 |
| 4148300670 | 89 | 3 1/2 | 4x13, 1x13 | 8x13 |
| Product Code and Brief Description | Angle | Front Flushing Holes | Side Flushing Holes | Weight (kg) |
| R1064-R38-S, R38 Retrac Button Bit, Spherical Buttons | 35° | 3 | - | 2.2 |
| R1370-R38-S, R38 Retrac Button Bit, Spherical Buttons | 35° | 4 | - | 2.4 |
| R1376-R38-S-1, R38 Retrac Button Bit, Spherical Buttons | 40° | 4 | - | 3.3 |
| R1376-R38-S-2, R38 Retrac Button Bit, Spherical Buttons | 35° | 4 | - | 3.3 |
| R1389-R38-S-1, R38 Retrac Button Bit, Spherical Buttons | 35° | 2 | - | 4.8 |
| R1389-R38-S-2, R38 Retrac Button Bit, Spherical Buttons | 35° | 4 | - | 4.8 |
