D-Sub Latch Lock Screw, 4-40 Thread, 0.216" Below Head
The Molex 1731120405 is a jackscrew accessory from the F-SGK, FCT series, designed for use with D-sub latch lock hardware. It carries a 4-40 thread and a threaded portion below the head measuring 0.216" (5.49 mm), with a slotted drive for hand or tool tightening. This is the screw that secures the latch lock to the D-sub shell — not a connector body, but the mechanical fastener that keeps the mated pair from backing off under vibration.
Thread Fit and Mechanical Compatibility
The 4-40 thread is the standard UNC size for D-sub hardware — the same thread used on the jackscrews of standard-density DB connectors. The 0.216" length below head matches the typical panel thickness and latch lock clearance in a standard D-sub shell. If you are replacing a missing or stripped jackscrew on a D-sub latch lock assembly, this is the direct fit for the Molex F-SGK / FCT series latch locks.