I've looked through catalog after catalog of connectors, but can't find either the male or female version of this connector anywhere! Does anyone have any ideas?
The pitch appears to be 2.54mm (0.1"), but the pin holes appear to be flat, rather than the typical square profile of header pins.
I just had a bit of a breakthrough, as I took the photos attached... it appears to say "ALEX" on the side of the connector, so I've just checked out www.alexconn.com, but am still completely lost.
I've seen a smaller 2-wire version of this as a battery connector on one of our cordless phones (a larger, outdated model).
The matching connector encases the connector in your photo.
It has grooves in the sides, to grip the ridges shown in yours.
The pins are square although the openings are rectangular.
I guess that describes half the header connectors out there. Sorry I can't be of more help.