Solder termination means each wire is hand-soldered or wave-soldered to the contact, not crimped — a detail that matters when the harness builder is setting up a bench station rather than a crimp press.
Termination is solder-only; the contact tails are designed for through-hole soldering into a PCB or for hand-soldering to discrete wires. Free-hanging (in-line) mounting means the plug body floats in the cable assembly, not anchored to a panel, so the cable strain relief and tie-wrap point need to carry the mechanical load.