10-Position Dual-Row Housing — What You're Actually Ordering
The Molex 5054321001 is the 10-circuit receptacle housing from the Micro-Lock PLUS 505432 series. It's a free-hanging (in-line) dual-row housing with a 1.25mm pitch, designed for wire-to-board applications where the mating header is board-mounted.
This is the single most common sourcing miss on this part.
Mating Half and Wire Range
This receptacle mates with the Micro-Lock PLUS 505432 series board-mount header (the male pin header with the matching latch). The 1.25mm pitch and dual-row layout are fixed — the header must be the same 10-circuit, 2-row configuration. The wire range accepted by the crimp terminals is specified in the terminal datasheet; the housing itself does not limit wire size — the terminal's wire barrel does.