The TE Connectivity 5552563-1 is a jackscrew socket from the CHAMP series — a screw-lock kit for vertical-mount applications on CHAMP D-Sub connectors. The 4-40 thread size matches the standard jackscrew hardware used across the CHAMP line, giving you a positive mechanical lock between the plug and receptacle that keeps the mated pair from vibrating loose in an industrial cabinet or a backplane card cage. Hardware is included in the box; you get the socket and any fasteners needed to attach it to the connector face.
Thread Size and Compatibility
The 4-40 thread is the standard UNC machine-screw size for D-Sub jackscrews — the same thread you find on the mating screw-lock posts of a CHAMP D-Sub plug or receptacle. No cross-reference to a different brand is on record; the part is a TE Connectivity original for the CHAMP series.