37-Position D-Sub Plug Housing — Shell Size 4
The TE Connectivity AMPLIMITE HDP-20 205210-7 is a 37-position D-Sub plug housing for male crimp contacts. It uses the standard shell size 4 (DC, C) layout, which is the correct shell for a 37-position D-sub — the same shell that carries 37 signal contacts in a two-row arrangement. The housing is free-hanging (in-line), with unthreaded flange features for panel-mounting with screws or slide-locks. The black glass-filled nylon (polyamide) dielectric provides the UL-rated insulation for the contact cavity block, and the steel shell with tin plating gives the standard EMI/RFI shield for this connector class.
For a complete connector assembly, you need the matching AMPLIMITE HDP-20 crimp contacts (male pin contacts for this plug side) and a crimp tool. The signal contact type means standard stamped-and-formed contacts rated for signal-level current, not the machined high-power contacts used in mixed-layout D-subs. The housing accepts the full range of AMPLIMITE HDP-20 signal contacts for 20-24 AWG wire.
The mating half for this plug housing is the TE 205209-2 — a 37-position receptacle housing for female contacts, same shell size 4 (DC, C), same free-hanging in-line mount, same unthreaded flange.
Shell Finish Variants — Tin vs. Zinc
The 205210-7 uses a steel shell with tin plating. The sibling 205210-8 is identical in every other spec — 37 positions, shell size 4, black nylon, free-hanging — but uses a steel shell with yellow trivalent chromium chromate zinc plating at 200µin (5.08µm) thickness. The tin-plated shell (205210-7) is the standard commercial finish; the zinc-plated version (205210-8) adds a corrosion-resistant chromate conversion coating, useful in higher-humidity environments. Both are active and interchangeable in fit — the choice is environmental exposure tolerance.