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Family reference image only — not a photograph of D38999/20FJ4SN. Check the part details for its contact arrangement, mounting and finish.
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D38999/20FJ4SN

MIL-DTL-38999 Series III · Wall receptacle

Socket-contact wall-mount receptacle with insert 25-4 and a nickel-finished aluminium shell.

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PART REFERENCE DETAILS

Technical reference.

Part referenceD38999/20FJ4SN
InterfaceMIL-DTL-38999 Series III
MountingWall receptacle / square flange (D38999/20)
Shell / insert25-4
Contacts48 × size 20 + 8 × size 16 (56 total); socket
TerminationCrimp
Shell / finishAluminium / electroless nickel (class F)
PolarisationN — normal
CouplingTriple-start thread
Insert service classI

Reference decoded from ordering and insert information, reviewed 2026-09-18. Confirm dimensions, ratings, materials and approvals for the exact quoted part.

← Browse D38999 Series III · Metal shell and related options

The manufacturer insert chart and ordering guide support these reference details. Working current and voltage depend on the selected contacts, wire, temperature and installation; confirm the operating limits in the quotation.

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