The 1958091-1 is a sealed copalum ring tongue wire terminal designed for 3/0 aluminum wire applications requiring high-temperature performance. The terminal features a copper body (ASTM-B187 annealed) with nickel plating (0.0003 inch minimum thickness per QQ-N-290) and a brass insert/funnel (MIL-C-50) with nickel plating (0.0001 inch minimum thickness per QQ-N-290). Key dimensional specifications include a maximum overall length of 3.21 inches, a conductor depth of 1.40 inches minimum, an insulation depth of 0.63 inches minimum, and a wire insulation diameter range of 0.520 to 0.633 inches. The terminal is designed for use with a 3/8 stud connection and has a weight of 103 ±5 grams. This terminal is commonly used in high-temperature electrical applications where reliable aluminum wire termination and sealed construction are essential for durability and performance.