The Amphenol FCI 86840-156HLF is a 56-position, dual-row unshrouded header from the BERGSTIK® II series, on the standard 0.100" (2.54 mm) pitch. It uses square male pins with gold or Gold, GXT™ mating finish — 30.0 µin (0.76 µm) thick — and a right-angle through-hole termination, so the pins sit parallel to the board edge for a 90° wire exit. This is a board-to-board signal interconnect, typically used as the pin header half of a pin-and-socket pair on a PCB.
The 0.100" (2.54 mm) pitch and 0.100" (2.54 mm) row spacing are the industry-standard grid — the board footprint matches any legacy 0.100" pattern, and the 56 positions fill a 28-pin-per-row length.