D38999/32Z19N
D38999/32Z19N - MIL-DTL-38999 Series III Plug Dust Cap | Size 19 | Black Zinc-Nickel
The D38999/32Z19N is a MIL-DTL-38999 Series III protective plug dust cap (also called a connector cover or protective cap) designed for shell size 19 plugs with black zinc-nickel finish, manufactured as a QPL accessory by multiple qualified vendors including Glenair, Amphenol PCD, and TE Connectivity / DEUTSCH. It is part of the /32 (plug cover) accessory family per MIL-DTL-38999 and is used to protect unmated plug pins from dust, moisture, mechanical damage, and EMI exposure in aerospace, defense, and industrial applications.
A MIL-DTL-38999 protective cap is a mechanical accessory designed to mate with the connector shell threads of MIL-DTL-38999 Series I, II, III, or IV plugs or receptacles. These caps are mandatory for any deployed military connector system because exposed pin fields and threaded coupling surfaces are vulnerable to contamination that can degrade electrical performance, cause intermittent failures, or prevent proper mating in the field. The D38999/32Z designation specifically targets plug (not receptacle) connectors and mates with the threaded plug shell using the same triple-start self-locking coupling threads as the main connector.
Key features include shell size 19 compatibility, black zinc-nickel plating per MIL-DTL-38999 (corrosion resistant, conductive for EMI grounding, RoHS compliant over older cadmium options), and a lanyard or chain retention option for captive attachment to the host cable assembly. The dust cap typically includes a rubber sealing gasket or O-ring rated for IP67/IP68 environmental sealing when properly installed. Operating temperature range typically spans -65C to +200C with chemical resistance to common aerospace solvents, fuels, and hydraulic fluids.
The D38999/32Z19N uses standardized MIL-DTL-38999 Series III mating interface geometry, meaning the cap is form-fit-function compatible with any QPL-qualified Series III plug connector of shell size 19. This includes insert arrangements ranging from 11 to 32 contacts depending on contact density. The cap threads match the plug's triple-start coupling threads, providing a positive mechanical lock and environmental seal identical to the main connector mating interface.
Typical applications include military ground vehicles (radios, navigation, ECU harnesses), aerospace avionics (flight control, communication, navigation bays), naval shipboard electronics (sonar, radar, fire control), and ruggedized industrial machinery (downhole oil/gas, mining, rail). In all of these, the cap protects the connector during shipping, storage, transit between operational sites, and periods of disconnection in the field.
When selecting a D38999/32Z19N cap, verify the host connector is Series III shell size 19 with the correct thread type (standard or metric, although military applications use imperial). The cap does not need to match the insert arrangement, only the shell size and Series designation. For Series I or Series II plugs, the equivalent part numbers are D38999/32 (Series I) and a different Series II part number, both cross-referenced in the MIL-DTL specification cross-reference PDF.
This page synthesizes cross-vendor availability, MIL-spec background, and practical selection guidance not consolidated in any single distributor listing, including same-vendor QPL alternatives and competitor equivalents qualified to the same MIL-DTL-38999 specification.
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