The 1-66109-5 is a socket contact for Metrimate pin and socket connectors manufactured by TE Connectivity/AMP. This contact is engineered for wire-to-board and wire-to-wire applications, accommodating 18–14 AWG wire sizes (0.8–2.0 mm²) with insulation diameters ranging from 0.8–2.0 mm. The contact features a brass body with stainless steel retention spring, available in selective gold/nickel or bright tin-lead finish, and is designed to mate with corresponding pin contacts in square grid, drawer, and in-line connector configurations. Operating within a temperature range of -55°C to +130°C, the contact maintains an insulation resistance of 5000 MO minimum and supports a dielectric strength of 2000 Vrms at sea level. The connector system is rated for 600 VAC/VDC (UL/CSA) and 440 V (IEC), making it suitable for industrial control panels, rack-and-panel systems, and general-purpose signal distribution in electronic equipment.