The 5749721-7: The 0.050-inch pitch and 0.100-inch row-to-row spacing pack 68 contacts into a shell layout that fits a standard D-sub footprint, but with finer pitch than the classic DB-style.
Mounting and Retention — Screws or Latchblocks
This receptacle mounts vertically through-hole with solder tails. The flange feature gives you two options for retention: a standard 2-56 threaded screw hole for a screw-lock install (vibration-resistant, good for panel-mount cables), or latchblocks for a quick push-to-lock mate with a matching plug. The latchblocks snap into place on the shell and engage the plug's latch ears — no tools needed for mating, but the screw option is better if the assembly sees shock or frequent disconnect.
Signal Duty Only — Don't Push the Current
The 0.050-inch pitch limits creepage distance, and the 30 V rating confirms it's not for power or bus distribution. If your circuit draws more than 1 A per line, you need a different connector family.