The locking ramp is the fastening mechanism: when the housing is pushed onto a mating C-Grid III header, the ramp deflects and snaps into the header's locking window, providing an audible and tactile confirmation of full mate. This is a field-serviceable latch — it can be released with a small screwdriver to unmate the pair without damaging the housing.
Contacts Not Included — Which Terminals to Order
This housing ships without contacts. The matching female crimp terminals for the C-Grid III 90156 series are ordered separately.