The 5040510601: The 0.059" (1.50 mm) pitch lets you route six signal or low-power lines in a footprint roughly the width of a standard 0.100" header's three positions — useful when the PCB real estate is already spoken for by passives or routing channels.
Contacts not included — the one line that changes your BOM
A common sourcing miss is ordering only the housing and stopping — the assembly is incomplete without the crimp contacts and the correct hand tool or applicator.
