It is a free-hanging (in-line) shell with a steel, tin-plated finish (200 µin) for basic EMI shielding and corrosion resistance. The housing uses a DE-9 shell size (connector layout 1) with two rows of signal contacts. A cable-side 4-40 threaded flange allows secure mating with a standard D-sub receptacle using jackscrews. The black housing is rated for signal-level circuits; the current rating depends on the contact and wire gauge chosen.
The 1658642-2 mates with any standard DE-9 D-sub receptacle housing (female shell, accepts female contacts). The cable-side 4-40 threaded insert accepts a jackscrew or slide lock to hold the pair together — critical for vibration-prone harness assemblies. The plug uses a free-hanging mounting style, so it is typically terminated to a cable bundle rather than a panel. The AMPLIMITE HDP-20 series supports a range of signal contacts (typically 20-24 AWG); the housing dielectric is thermoplastic, rated for the operating temperature of the chosen contact. The shell finish — steel with 200 µin tin plating — provides adequate shielding for most industrial signal applications, though it is not rated for high-frequency RF.