The 57102-F08-11ULF: Gold on the mating face handles occasional reconnects in clean environments; the tin-plated post (78.7 µin) solders reliably into plated through-holes. The 0.157" (4.00 mm) mating length gives a solid wipe before the push-pull latch seats.
Through-hole mounting with a 0.118" (3.00 mm) post length — the board thickness and solder fillet must stay within that tail. The 0.059" (1.50 mm) insulation height leaves clearance under the header for passives or traces on the top layer. Unshrouded means no side walls to interfere with adjacent components; the push-pull retention relies on the receptacle's latch, so the header itself adds no board-level locking.
Comparing to the 20-Position Sibling
The 57102-F08-10ULF is identical in every dimension, plating, current, and voltage rating — the only difference is 20 positions versus 22. If your BOM calls for 22, the 20-position part will not fit the receptacle cavity count. No other functional delta exists between the two.