The FCI 86837-128HLF is a 28-position, dual-row BergStik® II unshrouded header — a through-hole, solder-terminated male pin strip on the standard 0.100" (2.54mm) pitch. The 28 circuits are fully loaded across both rows, with a row spacing of 0.100" (2.54mm) matching the pin pitch.
Rated 5A per contact, which is typical for a 0.100" pitch square pin — the current path is through the pin body, so the limiting factor is temperature rise in the housing rather than the contact itself. The mating-side finish is 30.0µin (0.76µm) gold over the phosphor bronze base — that thickness is specified for repeated mating cycles and corrosive environments, not just a first-mate contact resistance target. The overall contact length of 0.600" (15.24mm) breaks down as 0.380" (9.65mm) mating length and 0.120" (3.05mm) solder tail, which sets the board-to-board stack height when mated with the corresponding female socket.
The insulation height above the board is 0.100" (2.54mm), matching the pitch — a compact profile that keeps the header low on the board.