The Amphenol FCI 87901-104HLF is a dual-row BERGSTIK II unshrouded header in the board-to-board style, sized at 0.100" (2.54 mm) pitch with 4 positions loaded across two rows spaced 0.100" apart. Phosphor bronze contacts carry 5 A per circuit with gold or Gold GXT plating at 30.0 µin (0.76 µm) thickness on the mating face; the push-pull fastening type holds the mated pair without a locking clip. The through-hole header mounts with 0.120" (3.05 mm) post length and an overall contact length of 1.040" (26.42 mm), with 0.820" (20.83 mm) of that length available for the mating interface. Insulation is black with a 0.100" (2.54 mm) housing height and a UL94 V-0 flammability rating; the header is unshrouded, meaning no polarization ribs — circuit alignment relies on the mating receptacle's lead-in geometry and the push-pull body's mechanical locate.
The 4-position dual-row count and 0.100" pitch place this header in the lighter end of the BERGSTIK II family — a 2-row × N layout for signal or moderate-power board stacking where 5 A per circuit supports low-level power alongside data. The 110 V rating is typical for signal-level board-to-board interconnects; confirm the actual circuit voltage against this ceiling before committing.
Confirm the mating receptacle from the BERGSTIK II series carries the matching 0.100" pitch and dual-row position count — the push-pull header seats into a friction-lock socket; the 1.040" overall contact length means the mated stack height will be governed by the socket's insulator depth added to this header's 0.100" insulation height.