What the part number tells you
A Series III number such as D38999/26WB35PN breaks down as: /26 = straight plug (Series III); W = olive-drab cadmium over nickel finish; B = shell size 11; 35 = insert arrangement (13 contacts, size 22D); P = pin contacts; N = normal keying. Change any one letter and it is a different part. The slash sheets, by series:
- Series I (bayonet, scoop-proof) — /1–/9: D38999/1, D38999/2, D38999/3, D38999/4, D38999/5, D38999/6, D38999/7, D38999/8, D38999/9
- Series II (bayonet, low-profile) — /10–/19: D38999/10, D38999/11, D38999/12, D38999/13, D38999/14, D38999/15, D38999/16, D38999/17, D38999/18, D38999/19
- Series III (triple-start thread, EMI) — /20 wall-mount receptacle, /24 jam-nut receptacle, /26 straight plug, plus /21, /23, /25, /27, /28, /29: D38999/20, D38999/21, D38999/23, D38999/24, D38999/25, D38999/26, D38999/27, D38999/28, D38999/29
- Series IV (breech-lock) — /40–/49: D38999/40, D38999/42, D38999/44, D38999/46, D38999/47, D38999/49
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Finish codes that go obsolete first
Finish is the letter after the slash sheet, and it is where availability breaks down. W (olive-drab cadmium) and F (electroless nickel) are common; K (firewall, stainless), Z (black zinc-nickel), M (composite, nickel), J (composite, olive-drab) and T (nickel-PTFE) are where lead times stretch and last-time buys happen. Searches by finish: /26W, /26F, /26K, /26Z, /26M, /26J, /26T.
When a drawing calls a finish nobody makes any more, we quote what exists and say so — including remaining stock, alternates with the same intermateability, and the qualification status of each. What we never do is substitute quietly.
Contacts, backshells and the rest of the assembly
A D38999 connector ships without contacts. Crimp pins and sockets are M39029 slash sheets — /58 pins and /56 sockets for Series III, /57 and /60 for Series I/II — sized 22D, 20, 16, 12 by dash number: M39029/58, M39029/56, M39029/57, M39029/60. Backshells and strain reliefs are M85049: M85049. Dust caps are D38999/32 and /33: D38999/32, D38999/33.
Send the whole connector line — shell, contacts, backshell, sealing plugs — and we quote it as one kit with one date code lot where it matters.
Manufacturers
Amphenol Aerospace, TE Connectivity / DEUTSCH, Souriau (Eaton), ITT Cannon, Glenair, Conesys / Aero Electric, Corsair and Sunbank all build to the same QPL, so a qualified part from any of them intermates. Brand pages: Amphenol · Deutsch · Souriau · ITT Cannon · Glenair · Conesys.