What it is and where it fits
The Amphenol FCI 87052-464HLF is the 64-circuit member of the BERGSTIK II dual-row board-to-board header series. Pitch is 0.100 inch (2.54 mm), with 0.100-inch row spacing giving a standard dual-rail footprint that routes cleanly in 0.100-inch grid layouts. Contacts are square male pins in an unshrouded header body — the push-pull fastening type means the mating receptacle latches by a push-in detent rather than screw-lock, suitable for applications where repeated mate/de-mate is expected but vibration locking is not required.
Contact plating and current rating
Both the mating-face and post-side contacts are tin-plated to 100 microinches (2.54 µm), which is a heavier tin coat than the minimum and provides good solderability retention over extended shelf life. The 5 A per contact rating is governed by the UL94 V-0 housing material's temperature ceiling; at 5 A per circuit through dual-row 64-position geometry the individual contact thermal budget stays within the housing rating at standard operating conditions. Voltage rating is 110 V — a signal-class ceiling, not a power rating, so this header is appropriate for signal bus or low-power distribution rather than mains-level power routing.
Board attachment and dimensions
Through-hole solder termination with a post length of 0.120 inch (3.05 mm) accepts standard PCBs in wave or hand-solder processes. The insulation body height is 0.100 inch (2.54 mm) — matching the header pitch, so the mated stack height is set by the receptacle insulator thickness rather than the header alone.
Typical applications and environments
Board-to-board headers at 0.100-inch pitch are the workhorse mezzanine and stacking interconnect in industrial control cards, instrumentation front panels, and communications equipment. The tin-plated contacts and UL94 V-0 housing suit commercial electronics environments; the push-pull fastening is adequate for fixed-installation board stacking but not for high-vibration machinery without a secondary retaining clip or screw-locked mating half. The 110 V rating is consistent with SELV signal-level circuits.