The FCI 86503-444HLF is a 44-position, dual-row unshrouded header from the BERGSTIK® II series, built for board-to-board stacking or wire-to-board interconnect through a standard 0.100" (2.54 mm) pitch.
What the 5 A rating means in practice
5 A per contact is the per-circuit limit at the rated temperature rise. The tin plating (100.0 µ" on the mating side) suits low-cycle, low-vibration environments.
The 0.100" pitch and 0.100" row spacing place the 44 pins on a standard 0.100" x 0.100" grid — the same footprint used by DIP sockets, ribbon-cable headers, and prototyping boards. The overall contact length is 0.470" (11.94 mm), with a mating pin length of 0.250" (6.35 mm) and a solder tail of 0.120" (3.05 mm).