The Molex 87916-118HLF is an 18-position single-row unshrouded header from the BergStik II series, built for board-to-board stacking on a standard 0.100" (2.54 mm) pitch grid. It carries 5 A per contact at 110 V, with gold or Gold GXT plating at 30.0 µin (0.76 µm) on the mating surface — enough cycle life for field-serviceable assemblies.
The 0.100" (2.54 mm) pitch is the breadboard-compatible spacing — this header drops onto a standard 0.100" grid without layout changes. The 18 positions are fully loaded, so the BOM line matches the pin count one-to-one. 5 A per contact at 110 V is a signal-class rating; the gold plating (30.0 µin / 0.76 µm) is what governs the real duty — it handles repeated mating cycles without fretting corrosion, which matters if this board gets reworked or field-serviced.