Selecting a jaw crusher requires a deep dive into material characteristics and production goals. First, evaluate the Feed Opening Size; the maximum size of the input material should be about 80% of the feed opening to prevent bridging. Second, consider the Crushing Ratio and the required Final Product Size (CSS - Closed Side Setting). For hard rocks like granite or basalt, ensure the Toggle Plate and Swing Jaw are made of high-manganese steel (Mn13Cr2 or Mn18Cr2) for maximum wear resistance. Additionally, check the Motor Power (kW) and Eccentric Shaft Speed to ensure the machine can handle your required Tons Per Hour (TPH) capacity without overloading.