The 1-1871315-0: This is a 40-position, dual-row header from TE's Dynamic D-1100 series, pitched at 2.00 mm. The full 4-wall shroud protects the male pins during mating and handling, and the board lock holds the header in place through wave solder.
Shrouded housing with detent lock
The header is shrouded on all four sides, which means the mating receptacle is guided into alignment and the pins are protected from accidental bending. A detent lock on the housing gives audible and tactile feedback when the connector pair is fully seated — you should hear it click. The board lock adds mechanical retention during soldering and in service, reducing shear stress on the solder joints from cable strain.