Primary Jaw Crushers Primary Jaw Crushers are ideal for crushing hard granite stones black trap rock river gravel lime stone coal and others Stone Jaw Crushers are available in four different models depending upon the size of the machine The common sizes for stone jaw crushers are available in 24 quot x12 quot 30 quot x15 quot 36 quot x24 quot and in 42 quot x36 quot sizes The approximate weight of jaw crushers are different for each product and vary from 7200 kg to 24000kgs The body of the stone jaw crusher are made of MS plates and fabricated with horizontal and vertical ribs to provide it the desired strength and durability The chances of the body getting cracked are minimized by processing it through heat treatmenst The roller bearings in the machine are properly lubricated The crank shaft are fitted in the center to offer equal balance to the machine and load daretribution Jaw plates and side plates are made of high tensile manganese steel and both are connected through a swinging lever He/Sheavy duty cast iron flywheels are fitted on both ends of crank shaft to ensure steady crushing force