The packaging is MIL SERIES CONNECTOR.Mounting type is CABLE AND PANEL.Then there's STANDARD: MIL-DTL-38999, POLARIZED, COMPATIBLE CONTACT: M39029/58364, for example.
D38999/20WF11AA Features
D38999/20WF11AA Applications
There are a lot of SOURIAU-SUNBANK D38999/20WF11AA Circular Connectors applications.