What This BergStik II Header Is
The Amphenol FCI 86503-442HLF is a 42-position, dual-row unshrouded male pin header from the BergStik II series, on the standard 0.100 inch (2.54 mm) pitch grid. The 42 circuits are fully loaded across two rows, with a row-to-row spacing of 0.100 inch (2.54 mm), keeping the footprint on a simple 0.100-inch grid for board layout.
The limiting factor here is the tin-on-tin contact interface — 100 µinch (2.54 µm) tin plating on the mating surface is a heavy wipe-grade finish that handles 25 to 50 mating cycles without fretting corrosion, but it is not built for frequent reconnection. For a permanent or semi-permanent board-to-wire or board-to-board link inside an enclosure, that is fine. The 110 V voltage rating matches the clearance and creepage of the 0.100-inch pitch on a standard FR-4 board. The UL94 V-0 black housing means it is rated for flame retardancy inside equipment enclosures.
This is a through-hole solder header — the 0.120 inch (3.05 mm) solder tail length suits standard 0.062-inch (1.6 mm) PCBs. The overall contact length is 0.470 inch (11.94 mm), with a 0.250 inch (6.35 mm) mating pin length that engages with standard 0.100-inch pitch receptacles.