The TE Connectivity 749087-3 is a jackscrew socket from the AMPLIMITE.050 series, designed as a screwlock for D-sub connectors in that family. It carries a thread size of 2-56 on the socket end and 4-40 on the screw end, with a length below head of 0.223" (5.66 mm).
Thread Size and Compatibility
The 2-56 socket thread accepts the standard jackscrew found on most AMPLIMITE.050 D-sub connectors, while the 4-40 screw thread matches the common panel-mount or backshell hardware. This dual-thread design means the 749087-3 can be used as a replacement or build-up part for any AMPLIMITE.050 D-sub assembly that uses a 2-56 socket / 4-40 screw locking system. It is compatible with standard D-sub connectors that follow the same thread convention, but the 0.050-inch contact pitch of the AMPLIMITE series is the specific housing family it was intended for.