Company:Shandong Winsense Machinery Co.,Ltd
Address:Korea Industrial Park,Fushan District,Yantai City,Shandong Province
The drill rods commonly used in mine shaft and lane engineering are hexagonal hollow steel and hollow steel. The inner diameters of hexagonal hollow steel are 22 mm and 25 mm, the outer diameters of hollow steel are 32 mm and 38 mm. The steel drill has finished steel and forged steel brass. The finished product brass is forged by a certain length and installed directly on the drill hole. Six the angle steel is cut, then the forging drill is used to forge the drill tail and drill head, then the drill bit is chiseled.