Zinc is the easiest metal to die-cast. It is economical to manufacture small parts, easy to coat, has high compressive strength and plasticity, and has a long casting life. The minimum wall thickness of zinc alloy die-casting parts can reach 0.3mm; the minimum wall thickness of aluminum alloy castings can reach 0.5mm; the minimum casting hole diameter is 0.7mm; the minimum thread pitch is 0.75mm.