What this 1.27mm-pitch shrouded header is for
The 1600641103 is a Molex 6-position, 2-row vertical header with a 1.27mm pitch, designed for board-to-cable/wire connections.
This header mates with a Molex 1.27mm-pitch receptacle housing — look for the matching 6-circuit, 2-row, shrouded receptacle from the same 160064 base series. The crimp terminal that drops into that receptacle is a Molex 1.27mm-pitch female terminal, typically 28-30 AWG wire range. It's three parts, not one: header, housing, terminal — confirm all three before committing the BOM line.
Board layout notes for the 1.27mm pitch
The 1.27mm pitch sets the board footprint — the two rows are spaced 1.27mm apart, and the through-hole solder tails require drilled holes matching the pin diameter. In a mixed-technology board, the through-hole header can be wave-soldered after SMT reflow.