Faston flag terminal, dual-gender
The 151321-4 is a dual-gender quick-disconnect terminal in TE's Faston series — it serves as both a receptacle and tab on the same contact, accepting a 0.250" (6.35mm) wide mating tab. Rated for 14-18 AWG wire with a crimp termination, the tin-plated brass contact carries no insulation and mounts free-hanging with a right-angle flag orientation.
Same-tab-width peers in the field
The 151321-4's 0.250" tab width and 0.032" tab thickness match the Utilux-series 1-1627194-4, which is a female-only terminal for 15-18 AWG with a narrower insulation diameter range of 0.102" to 0.122" — the 151321-4 accepts a wider wire insulation (0.120" to 0.170") and offers a dual-gender contact. The Utilux 1-1659250-0 uses a 0.248" tab width and 0.031" tab thickness for 17-20 AWG wire — the 151321-4 covers a heavier wire range (14-18 AWG) with a slightly wider tab.