These are produced by Powell or Amphenol.
Mil-Spec Circular Connectors Product Roundup
M39029/58-363 Amphenol Circular Mil Spec Connector Gold Contact
TE Connectivity DEUTSCH - M39029/5-118 - Contact Socket
Amphenol - Circular Mil Spec Contacts
TE Connectivity DEUTSCH - M39029/5-116 - Contact Socket Assyembly
TE Connectivity DEUTSCH - M39029/4-110 - Contact Pin, Size 20
Industrial Wire & Cable Connectors 12 Pins for Panel for sale
Connector Tooling Guide, PDF, Electrical Connector
The M39029/56-352 is a crimp Socket Contact for use with MIL-DTL-38999 series III circular connectors. This crimp contact is made of copper with gold
AMPHENOL AEROSPACE M39029/56-352 Circular Connector Contact, MIL-DTL-38999 Series III TV, TV/CTV Series, Socket, Crimp, 16 AWG
Contact Pin, Size 22D, Male, Crimp Terminal, Gold Plated, Mil-C-39029 Series
M39029/58-360
JST1030 Crimp Tool Kit (JRD-AF8 M22520/1-01 Crimp Tool+TH163 Turret Head) 12-26awg 3 Pack
Mil-Spec Circular Connectors Product Roundup
Mil-Spec Circular Connectors Product Roundup
Tooling for M39029/56-353
DJT MIL-DTL-38999 Series Datasheet by TE Connectivity Deutsch