The Amphenol FCI 10162583-411151LF is a 51-position plug from the Conan™, MezzSelect™ series, using center strip contacts on a 0.039" (1.00mm) pitch. Gold flash on the contacts handles a modest number of mating cycles; this isn't a connector you'd repeatedly unmate in the field.
Why the pitch and orientation matter for your board layout
At 0.039" (1.00mm) pitch, this plug demands a PCB with fine trace routing between pads — you're not running wide power traces through this connector; it's a signal-density interconnect. No hand-soldering this one on site; if a pad lifts, the whole board needs rework.
51 positions vs the 41-position sibling — same footprint, different circuit count
The 10162583-411141LF is the 41-position version at the same 0.039" (1.00mm) pitch and 0.211" (5.35mm) height. No other spec changes between them — same gold flash, same right-angle SMT, same board guide features.