The Amphenol FCI 67998-256HLF is a 56-position dual-row unshrouded male header from the BERGSTIK II series, on a standard 0.100" (2.54 mm) pitch.
Rated 5 A per circuit at 110 V — the current is typical for signal-level duty on a 0.100" pitch header; the voltage rating is conservative for the 0.100" insulation height. The 0.525" overall contact length (0.318" mating length plus 0.107" post) gives a standard through-hole footprint; the 0.107" post length suits a typical 0.062" board with room for a solder fillet.
Phosphor bronze contacts with a square pin cross-section — the square profile provides consistent contact wipe in the mating receptacle.
