Rock drill y19a The rock drill is mainly used in samll quarries, small coal mines and limestone mines for drilling, blasting for constructing roads in mountain areas, alsoz in the capital construction for water conservancy works.It is suitable for drilling works in large mines for boulder blasting and other projects as well. Specification Weight 19kg Outside dimensions(l-w-h) 600-534-157mm Cylinder dia 65mm Piston stroke 54mm Air pressure 0.4~0.5mpa Air pipe inner dia 19mm Water pipe inner dia 13mm Shank dimension 22-108mm When working pressure is 0.4mpa 0.5mpa Impact energy28j40 j Impact frequency28hz35 hz Idling speed180 r/min200 r/min Air consumption _37 l/s _43 l/s