excellent coal mining drill bit, carbide bit

الوصف

Coal drill bit/ coal bit: Applications: Apply to the anchor-network support hole drilling in coal mine, hydraulic project. Etc. Characteristics: 1. High wear resistance and impact-resistance toughness. 2. To repeat repair & gleaning are not necessary, long drill life. 3. High efficiency could be promoted sharply in penetration of high-medium hard rock formation. 4. Labour intensity could be reduced. 5. Rock formation to be suitable t: F=***2 Colliery Drilling Tools Main Standard(mm) D H L M Thread joint *7 *4 *7 M*4 1.5 *7 *4 *7 M*2 1.*5 *8 *4 *0 M*2 1.*5 *9 *2 *8 M*4 1.5 *0 *0 *8 M*4 1.5 *2 *2 *2 M*4 1.5 *2 *6 *2 M*2 1.*5