The Amphenol FCI 68705-425HLF is a 25-position, single-row BergStik II unshrouded male header on a 0.100" (2.54 mm) pitch.
The 0.100" pitch is the standard 2.54 mm grid — your PCB footprint needs to match that centerline spacing exactly. Tin contacts at 100.0 µin (2.54 µm) thickness are fine for a few mating cycles in assembly and test, but if this connector sees repeated field service, the tin will fret and the contact resistance drifts — gold plating on the mating half helps but does not fix the tin-to-tin interface. The 0.200" (5.08 mm) mating pin length gives a solid wipe before the contact seats.