It carries a 4-40 socket thread on the mating end and a 4-40 screw thread on the panel side, with a threaded portion length of 0.311" (7.91 mm) below the head.
The 4-40 thread is the standard UNC size for D-subminiature locking hardware, shared across the AMPLIMITE HD family. The 0.311" threaded length below the head sets the maximum panel or bracket thickness the screw can engage — any thicker and the threads won't reach the mating nut or standoff. The socket end accepts the male jackscrew from the mating connector half, so the pair cinches together without tools.