The Locking Ramp — Why It Matters for Field Service
For equipment that ships as a sub-assembly and gets mated in the field (appliance control boards, thermostat harnesses), that click saves callbacks from loose connections.
Contacts Not Included — The Sourcing Trap to Watch
This is the most common miss on a BOM line: the buyer sees a 4-position housing and assumes it arrives with terminals. It does not. The mating contact is the SL-156 crimp socket (TE part number 640550-1 or equivalent), which must be crimped onto 18-24 AWG wire before insertion. Factor the terminal cost and the crimp tooling into the total line item, not just the housing price.