BERGSTIK II Unshrouded Header, 21 Circuits
The Amphenol 91276-121HLF is a BERGSTIK® II series unshrouded male pin header, 21 positions in a single row on the industry-standard 0.100" (2.54 mm) pitch. It terminates through-hole for solder attachment to the PCB, with a 0.900" (22.86 mm) mating pin length and a 0.225" (5.72 mm) post for board thickness flexibility. The push-pull fastening means the retention comes entirely from the mating receptacle's latch system — the header itself provides no locking.
The 0.100" (2.54 mm) pitch is the classic breadboard-compatible spacing — any PCB footprint or mating socket designed for standard 0.100" headers will accept this part. The 21-position count is the BOM line check: confirm your circuit count matches before committing. Tin-plated headers at this pitch are cheaper but degrade faster under repeated use. The phosphor bronze contacts are a reliable spring alloy for this pitch class — they hold contact force without taking a set over temperature.
The push-pull retention means the mating half must provide the latch; the header itself has no locking ramp.