Decode an existing part number
Build a new part number
Picking an insert arrangement above sets this automatically — or choose a shell size here first to narrow the arrangement picker.
Accessories
Parts list
Tick “Add to parts list” next to any part number above: the connector, its contacts, a mate or an accessory, as you build other connectors. Contact quantities are for one connector; edit the quantity for more. The list clears on reload — copy or download it before you leave the page.
No parts yet.
| Qty | Part number | Description | Newark | Remove |
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Copy list gives part number, quantity and description separated by tabs, for a spreadsheet or a distributor’s paste-a-list form. The CSV has the same columns with a header row.
Check every part number and quantity against the current specification before you buy. Neither this site nor Newark is responsible for errors in generated part numbers; see Part numbers and purchases.
About this builder
MIL-DTL-38999 Series IV connectors are scoop-proof miniature circular connectors with breech coupling and metric dimensions. Their part numbers start with D38999/ and the slash sheet. This builder covers /40 (wall mount), /42 (box mount), /44 (jam nut), /46 (plug with grounding fingers) and /47 (straight plug), and the hermetic /41, /43, /45 and /48.
Find the mating connector
Build or decode a part number and the builder lists its candidate mating connectors: a plug for a receptacle or a receptacle for a plug, with the same shell size, insert arrangement and polarization or insert position, and the opposite contacts, pins to sockets. Similar plating and Similar contacts narrow the list, and Hermetic switches to the hermetic mates. Add a mate to the parts list with one click, and check it against both detail sheets before you use it. See Finding a mating connector.
Accessories that fit
The Accessories panel lists the backshells, shrink boots, shield bands and seal plugs for the connector you built, and builds each accessory’s part number for that connector’s shell size as you pick its options. Its Dust Caps section names the plastic dust cap the specification calls for, M85049/138, with its status; that sheet is SAE-only, so its part numbers aren’t built here. See M85049 accessories.
Build or decode a part number
Choose the options one field at a time, or paste a part number such as D38999/44WH23SA into Decode to see what each part of it means. Each list offers only the options the specification allows with your earlier choices. Tick “Add to parts list” to collect the connector, its contacts, mates and accessories as you go, then copy the list or download it as CSV.