What this connector is
The Amphenol FCI (now Amphenol) 87052-170HLF is the 70-circuit dual-row member of the BERGSTIK II series — a 0.100-inch (2.54 mm) pitch unshrouded male pin header rated 5 A per contact, designed for board-to-board stacking and panel-to-board interconnects in industrial and communications equipment.
Ratings that drive selection
Mating and termination
Termination is through-hole solder — the post extends 0.120 inch (3.05 mm) below the housing for mechanical retention in the plated through-hole, with an overall contact length of 0.990 inch (25.15 mm) and a mating length of 0.770 inch (19.56 mm). All 70 positions are loaded — no partial-load option on this part number — and the header is unshrouded, so it mates with the matching BERGSTIK II dual-row receptacle housing or any standard 0.100-inch pitch dual-row female header with the same row spacing and pin count. Fastening type is listed as push-pull, consistent with the friction-latch engagement of a header pin into a housing slot — no external locking clip is specified for this part.
Physical and material notes
Insulation height is 0.100 inch (2.54 mm), the same as the pitch — when two boards are stacked header-to-header the mated stack adds two insulation heights plus any board thickness, which matters for z-height budget in tight enclosures. Contact material is phosphor bronze, which provides better spring temper and fatigue resistance than brass — the square contact cross-section maintains consistent contact force through the mating interface. Insulation color is black — primarily cosmetic, but useful in white or light-colored equipment enclosures where visual identification of the interconnect row matters during assembly and service.