Mark I female quick-disconnect terminal — 0.250" tab, nickel-plated
The 1-160773-0: The phosphor bronze contact carries a nickel finish, and the non-insulated barrel accommodates insulation diameters from 0.091" to 0.130" (2.31mm to 3.30mm).
Nickel vs tin contact finish — selection within the series
The 1-160773-0 uses a nickel-plated contact, while the functionally identical 160773-7 and 160773-4 in the same Mark I series use tin-plated contacts — the tab width, wire range, and overall length are shared.
