YT27 The rock drill is a kind of high efficiency air leg rock drill machinery.it is mainly used for blasting holes and other drilling works in a quarries, railway construction, water conservancy construction and defence project facility. specification Weight 27 kg Outside dimension(L¡ÃW¡ÃH) 668¡Ã248¡Ã202mm Cylinder dia 80mm Piston stroke 60mm Impact energy ¡Ã75.5J Impact frequencey ¡à 36.7Hz Air consumption ¡Ã83.3L/S Air pipe (inner dia) 25mm Water pipe (inner dia) 13mm Air pressure 0.63MPa Water pressure 0.3MPa Bore dia 34-45mm Bore depth 5m Shank dimensions(hex¡Ãlength) 22¡Ã108¡Ãmm¡Ãmm