9-Position D-Sub Receptacle, Unthreaded Flange — What This Connector Is
The Molex 1731090862 is a 9-position D-Sub receptacle from the FCT 173109 series, arranged in two rows in the standard DE-9 (E) shell size. The shell is steel with tin plating for basic EMI shielding, and the housing uses a glass-filled polyester dielectric rated UL94 V-0. A key distinction: the flange is unthreaded — it has no threaded insert for 4-40 jackscrews, so it mates with a plug that uses slide-locks or a locking post, not the typical screw-lock hardware.
The unthreaded flange means the mating plug must use a slide-lock or snap-in retention system; if your cable assembly uses standard 4-40 threaded jackscrews, this receptacle will not secure to it.