D-sub Screwlock Kit, Not a Connector
The TE Connectivity 5748271-3 is a jackscrew socket kit for the AMPLIMITE series of D-subminiature connectors. The thread size is 4-40 socket and 4-40 screw, and the length below the head measures 0.312" (7.92 mm). This kit is used with AMPLIMITE D-sub connectors to provide the mechanical retention that keeps the plug and receptacle mated under cable strain or vibration. The hardware is included in the bagged package — no separate sourcing of screws or washers needed.
Thread Size and Fit: 4-40 Socket, 4-40 Screw
The thread size is 4-40 socket and 4-40 screw. This is the standard UNC 4-40 thread used across nearly all standard-density D-sub connectors. The 0.312" (7.92 mm) length below the head is enough to engage the threaded insert in the mating connector's flange — typically a D-sub backshell or a panel-mount receptacle. If you are replacing a missing or stripped jackscrew on an existing AMPLIMITE D-sub assembly, this kit is the direct fit. The female socket accepts the male screw from the mating half; the included 4-40 screw secures the kit to the connector body.
Compatibility: AMPLIMITE D-sub Only
This screwlock kit is for use with AMPLIMITE series D-sub connectors. It is not a generic D-sub hardware kit — the thread size and shoulder dimensions are specific to the AMPLIMITE product line. If you are working with a standard-density D-sub from another manufacturer (e.g., Amphenol, NorComp, or Cinch), the 4-40 thread size is common, but the length below the head and the socket depth may differ. For AMPLIMITE connectors, the fit is verified. The hardware included covers both the female socket and the male screw, so no additional fasteners are required.