The 0.156" (3.96mm) pitch gives enough spacing to route 18-22 AWG wire without crowding the adjacent cavity — common for appliance, HVAC, and industrial control harnesses where the wire bundle feeds a PCB header.
The Contacts Are Not in the Bag — Order Them Separately
No terminal in the bag means the BOM needs two lines: one for the housing, one for the contacts. The housing accepts the standard SL-156 crimp socket, which takes 18-22 AWG stranded wire.
Mating Half and Locking — What Snaps In
This receptacle mates with the SL-156 series pin header, typically a vertical or right-angle through-hole header on the PCB. No secondary lock or screw is needed for a cabinet environment; the ramp holds against moderate vibration. If the harness sees constant flex or machine vibration, a wire strain relief or cable tie point near the connector is worth adding.
640251-6 vs the 5-Position Sibling
The 640251-6 is the 6-position version of the same SL-156 housing family. The 5-position 640251-5 shares the same 0.156" pitch, natural nylon body, and free-hanging crimp format — the only difference is the cavity count. If your harness needs six circuits, the 640251-6 is the match; the 5-position version leaves one circuit unpopulated and wastes a cavity. No other spec changes between the two.
No official second-source cross-reference is on record; the 1-2069882-6 from the same series is a 2-row, 5.08mm pitch part and is not a direct fit.