Crimp termination, free-hanging fit
The 180437-2 is a non-insulated Faston receptacle that crimps onto 15-20 AWG wire and hangs free in-line — the serrated termination bites into the conductor for mechanical hold before the tin-plated brass contact engages the mating tab. Tab width is 0.110" (2.79mm) with a 0.020" (0.51mm) thickness; the insulation diameter range of 0.059" to 0.110" (1.50mm to 2.79mm) covers common wire insulation sizes in this gauge range.
