Reference image for 38999 series iv. Family reference image — MIL-DTL-38999 Series IV circular connector family. Reference receptacle; configuration varies.

Circular connectors / Source by specification

D38999 Series IV · Quarter-turn

Series IV · Breech-lock circular

Aerospace circular connectors using a quarter-turn breech lock, with environmental and hermetic receptacle options.

Aerospace · Land
Equipment power and mixed-circuit harnesses.

Price and lead time on request

SOURCING OPTIONS

One requirement. More possibilities.

Request an exact part reference or ask us to propose alternatives against your specification. We compare the interface, ratings, materials and required documentation before quoting a configuration.

A shared standard or similar appearance does not confirm interchangeability. Any proposed substitute requires your approval.

REFERENCE FAMILY DETAILS

Technical reference.

Standard	MIL-DTL-38999 Series IV
Coupling	90° quarter-turn breech lock
Inserts	MIL-STD-1560 arrangements
Termination	Crimp and PC-tail options
Versions	Environmental and hermetic styles

Reference-family data. Confirm dimensions, ratings, materials and approvals for the exact quoted part.

Power capability follows the chosen insert and contact arrangement.

D38999 Series IV · Quarter-turn

One requirement. More possibilities.

Technical reference.

Related product families.

D38999 Series III · Metal shell

D38999 Series III · Composite

D38999 Series I · Bayonet