The Amphenol 86840-104HLF is a 4-circuit, dual-row unshrouded male header from the BERGSTIK® II series, built on the standard 0.100" (2.54 mm) pitch. The 30.0 µin (0.76 µm) gold plating on the mating surface handles moderate mating cycles without degrading contact resistance, while the UL94 V-0 rated black housing suits equipment inside an enclosure requiring a flammability rating.
The 0.100" pitch is the legacy through-hole footprint — every PCB layout tool has a padstack for it, and the 0.100" row spacing mirrors it, so the board pattern is a straightforward 2×2 grid. The 30 µ" gold plating is the key spec for duty — it supports repeated connect-disconnect cycles in test fixtures or field-serviceable boards, whereas a tin-plated equivalent would wear faster under the same cycle count.