🛡️ What It Is
A split‑body, EMI‑protected backshell for MIL‑DTL‑24308 D‑Subminiature connectors (Micro‑Miniature D‑Sub) — offered in top‑entry, side‑entry, or end‑entry forms.
🧩 Decoding the P/N: 550T039M3R1A0‑03
| Segment | Meaning |
|---|---|
| 550 | D‑Sub backshell series |
| T | Cable entry type: T = Top |
| 039 | Model family |
| M | Finish: Electroless Nickel (standard EMI shielding) |
| 3 | Shell size: 3 (Medium D‑Sub BCR, ~57 mm width) |
| R1 | Panel mounting: Rear‑mount, with 0.031″ (0.8 mm) panel thickness |
| A | Jackscrew type: Socket‑head male |
| 0 | No EMI gasket included. |
| ‑03 | Cable-entry port: 0.312″ (7.9 mm) diameter—fits up to .312″ round cable shield |
✅ Use Case
Ideal for rugged installations where you have a D‑Sub panel connector that requires:
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Reliable EMI shielding
-
Cable strain relief
-
Split housing for retrofitting without rewiring cable
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Panel‑mount on 0.8 mm thick flange, with top‑entry cable



