321522 is a pre-insulated PIDG ring tongue terminal designed for reliable termination in control circuits and power wiring applications. The terminal features a tin-plated copper body with a copper sleeve and nylon insulation sleeve, accommodating 20-16 AWG solid or stranded wire with a maximum wire diameter of 0.125 inches. The design incorporates a serration or dimple feature inside the terminal barrel to provide exceptional barrel contact and tensile strength, while the special plating process creates high resistance to corrosion. This terminal is UL and CSA approved and is commonly used in automotive, industrial control, and heavy-duty power distribution applications where reliable, long-term termination performance is required.