What this connector is
The Amphenol 86503-418HLF is an 18-circuit dual-row unshrouded male pin header in the BERGSTIK II series — a standard 0.100-inch (2.54 mm) pitch board-to-board interconnect with through-hole termination. The housing is black PA nylon rated UL94 V-0, and all 18 positions are loaded with square-pin contacts in phosphor bronze, tin-plated on both the mating face (100 µin / 2.54 µm) and the solder tail. The push-pull push-pull fastening type relies on the header's own pin-to-receptacle interference rather than a separate locking tab — this is the expected behaviour for an unshrouded BERGSTIK II header. With 5 A per contact at 110 V, the 86503-418HLF sits above pure signal-header territory — the tin plating grade and phosphor bronze base metal are appropriately matched to low-level power distribution across the 18 circuits rather than high-current busing. The 0.100-inch insulation height of 0.100" (2.54 mm) defines the mated stack dimension for board-separation calculations.
Board layout fit
The 0.100" (2.54 mm) pitch and 0.100" row spacing are the canonical 2.54 mm grid — footprint-compatible with any dual-row 0.100" header from any manufacturer using the same grid. The through-hole post length is 0.120" (3.05 mm) with an overall contact length of 0.470" (11.94 mm); the mating extension above the board surface is 0.250" (6.35 mm). Board planners should confirm the 11.94 mm overall length does not conflict with underside components or stiffener features.
What it mates with
The 86503-418HLF is the male pin header half. It mates with any matching dual-row 0.100" receptacle or female IDC connector housing that accepts square pins at the stated row spacing. The unshrouded pin field means polarisation is determined entirely by the mating connector's keying features or the board-side silkscreen — there is no integral polarizing rib on the header itself. All 18 positions are populated, so the mating receptacle must carry all 18 contacts.