Specifications
The coal bit mainly used in coal mine drilling for roof bolting.We do different measures according to customer's requirements
The coal bits mainly used in coal and mine drilling.We can do different measures according to customer's requirement or drawing
type one
| Colliery Tools | Main Standard(mm) | |||
| D | H | L | M | |
| 27 | 44 | 17 | M14×1.5 | |
| 27 | 54 | 17 | M12×1.75 | |
| Thread | 28 | 54 | 20 | M12×1.75 |
| joint | 29 | 52 | 18 | M14×1.5 |
| 30 | 50 | 18 | M14×1.5 | |
| 32 | 52 | 22 | M14×1.5 | |
| 32 | 56 | 22 | M12×1.75 |
type 2
| Colliery Tools | Main Standard(mm) | |
| D | M | |
| Thread Joint | 38 | 12 |
| 40 | 12 | |
| 42 | 12 |
