What This Connector Is
The Amphenol FCI 86503-450HLF is the 50-circuit member of the BERGSTIK II board-to-board header series — a dual-row, unshrouded male pin header on 0.100" (2.54 mm) pitch intended for through-hole solder mounting in industrial control cards, automation modules, and instrumentation assemblies. The 0.100" row spacing matches the pitch, so the 50 positions distribute across two rows at standard 2.54 mm grid spacing; all 50 circuits are loaded. Tin plating at 100 µin (2.54 µm) covers both the mating interface and the solder-post side. Contact material is phosphor bronze, and the insulation body carries a UL94 V-0 flammability rating. The push-pull fastening type indicates the mating connector's housing provides retention — the header itself carries no integral lock. Contact shape is square, which seats into the matching receptacle's beam geometry with predictable normal force. Insulation height is 0.100" (2.54 mm), matching the pitch and confirming the stack-height dimension for board-to-board or mezzanine stacking.
What It Mates With
The 86503-450HLF mates with the corresponding BERGSTIK II dual-row receptacle housing — typically a female IDC or box-connector socket that accepts the square pin array at the same 0.100" grid. Because the header is unshrouded, keying and polarization depend entirely on the receptacle's housing ribs or chamfered corners, not on the header's own shroud. Verify the mating half's retention mechanism and board footprint separately from this listing. Termination is through-hole solder — the post drills into the board and is wave- or hand-soldered, not surface-mounted, which constrains this part to through-hole PCB processes and makes field replacement a reflow-desolder operation rather than a hot-air swap.