The 4-102972-0-25 is a 25-position, single-row unshrouded header from TE's AMPMODU Mod II series. Pitch is 0.100" (2.54 mm) — the standard grid for 0.100" ribbon cable and most prototyping boards. That tail length is enough to clear a 1/16" board and still have 0.050" of solder fillet visible on the far side. The tin-lead post finish (100 µinch) is the solder side; it wets well with standard SnPb or SAC305 solder profiles.
Common mates include the 5-104507 series IDC receptacles and the 1-87499 series crimp-socket housings. Through-hole mounting: the 0.125" post length fits a 0.062" PCB with standard wave-solder standoff.
