What This Locking Post Assembly Is
It is the threaded post that slides into the D-sub shell's mounting ears and accepts the screw-lock or hex-nut to secure the mated pair. Hardware is included in the bag — you get the bolt and the retaining clip or nut needed to install it into the connector body.
Thread Size and Fit — the 2-56 Standard
The thread size is 2-56 UNC, the standard for D-sub jack-screw hardware on standard-density and high-density shells. The length below the head measures 0.443" (11.25 mm), which clears most standard D-sub panel thicknesses and backshell cavities. If you are replacing a missing or stripped post on an AMPLIMITE HDE, HDF, or HDP shell, this is the direct drop-in part.