The TE Connectivity 5745563-4 is a jackscrew socket kit for the AMPLIMITE HDE-20 series of D-subminiature connectors. It's a 10-piece bag of female screwlock hardware — each with a 4-40 threaded socket on one end and a 4-40 screw on the other — meant to secure the connector pair against vibration and cable strain. The threaded portion below the head measures 0.250" (6.35 mm), which is the standard engagement depth for HDE-20 backshells and hoods. Hardware is included in the bag, so you get the screws and sockets together, no separate sourcing.
Thread Size and Compatibility
The thread size is 4-40 on both the socket and the screw — that's the standard UNC thread for D-sub hardware. This kit mates with any AMPLIMITE HDE-20 connector housing, hood, or backshell that accepts a 4-40 jackscrew. The 0.250" threaded length below the head is enough to engage the mating thread in the receptacle without bottoming out. If you're replacing a lost or stripped screwlock on an HDE-20 assembly, this is the direct drop-in part.