Jaw plate is an important component in a stone crusher machine, functioning as a stone crusher. Consists of two parts: Jaw Plate Type 1. Upper jaw plate (moving jaw): moves and crushes rocks. 2. Lower jaw plate (fixed jaw): still and holds rocks. Manufacturing Materials 1. Manganese steel (Mn-Steel). 2. Chromium steel (Cr-Steel). 3. Martensitic steel. Function 1. Crushing rocks into smaller sizes. 2. Increasing crushing efficiency. 3. Reducing machine wear. 4. Maintaining product quality. Applications 1. Mining industry. 2. Stone processing plant. 3. Road and bridge construction. 4. Cement and aggregate industry.