In mineral processing, the jaw crusher is the first stage of comminution, and jaw plates are the most critical and fastest-wearing wear parts. This article explains what jaw plates are, their common materials (Mn13%, Mn18%, Mn22%), tooth patterns, and how they affect crushing efficiency, energy consumption, and product size. A practical selection logic based on rock type and processing goals is provided, along with guidance on lowering cost per ton. HUATAO GROUP supplies high-manganese, bimetal, and custom-tooth jaw plates for mining, quarrying, and recycling applications worldwide.