Many producers refer to jaws as breakers meaning that they break the rock down to a size manageable for the secondary crushers The numbers used in referring to jaw crushers such as 3042 refer to the opening size at the top of the jaw The 30 is 30 left to right the 42 is 42 across the jaw Allowable top size is Many producers refer to jaws as breakers meaning that they break the rock down to a size manageable for the secondary crushers The numbers used in referring to jaw crushers such as 3042 refer to the opening size at the top of the jaw The 30 is 30 left to right the 42 is 42 across the jaw Allowable top size is…