Defense Logistics Agency DLA logo and Link to DLA website DLA logo and Link to DLA website DEFENSE LOGISTICS AGENCY DLA Land and Maritime Mil Spec

MIL-DTL-38999



Connectors, Electrical, Circular, Miniature, High Density, Quick Disconnect (Bayonet, Threaded, or Breech Coupling), Environment Resistant with Crimp Removable Contacts or Hermetically Sealed with Fixed, Solderable Contacts, General Specification for (w/Amendment 1) FSC: 5935

This specification covers four series of miniature, high density, bayonet, threaded, or breech coupling, circular, environment resistant, electrical connectors using removable crimp or fixed hermetic solder contacts, and are capable of operation within a temperature range of -65 Deg. C to +200 Deg. C.



Points of Contact:

Circular Connector Group Phone: 614-692-YYYY Email: CircularConnector@dla.mil

Document Downloads

Connectors, Electrical, Circular, Miniature, High Density, Quick Disconnect (Bayonet, Threaded, or Breech Coupling), Environment Resistant with Crimp Removable Contacts or Hermetically Sealed with Fixed, Solderable Contacts, General Specification for (w/Amendment 1) Revision: N, Dated: 14 September 2023 File Name: dtl38999.pdf, File Size: 2677 kb


Memorandum For MIL-DTL-38999 Qualified Manufacturers, Assembly Houses and Value-Added Distributors.
Dated: 17 January 2023
File name: dtl38999suppliersmemo.pdf, File Size: 173 kb

Connectors, Electrical, Circular, Miniature, High Density, Quick Disconnect (Bayonet, Threaded or Breech Coupling), Environment Resistant with Crimp Removable Contacts or Hermetically Sealed With Fixed, Solderable Contacts, General Specification for
Dated: 09 June 2026
File name: iddtl38999.pdf, File Size: 2821 kb

List of MIL-DTL-38999 Associated Specifications
Dated: 11 February 2015
File name: dtl38999sup1.pdf, File Size: 42 kb

Connectors, Electrical, Circular, Receptacle, Dummy Stowage, Bayonet Coupling, (MIL-DTL-27599 Series I and MIL-DTL-38999 Series I)
Dated: 20 October 2017
File name: dtl38999ss9.pdf, File Size: 82 kb

Connectors, Electrical, Circular, Receptacle, Dummy Stowage, Bayonet Coupling, (MIL-DTL-27599, Series II and MIL-DTL-38999, Series II)
Dated: 11 August 2022
File name: dtl38999ss10.pdf, File Size: 182 kb

Connectors, Electrical, Circular, Receptacle, Dummy Stowage, Bayonet Coupling, (MIL-DTL-27599, Series II and MIL-DTL-38999, Series II)
Dated: 22 August 2025
File name: iddtl38999ss10.pdf, File Size: 325 kb

Connectors, Electrical, Circular, Receptacle, Wall Mounting Flange, Removable Crimp Contacts, Series III, Metric
Dated: 11 August 2022
File name: dtl38999ss20.pdf, File Size: 202 kb

Connectors, Electrical, Circular, Receptacle, Threaded, Wall Mounting Flange, Removable Crimp Contacts, Series III, Metric
Dated: 22 August 2025
File name: iddtl38999ss20.pdf, File Size: 384 kb

Connectors, Electrical, Circular, Threaded, Receptacle, Box Mounting Flange, Hermetic, Hermetic Solder Contacts, Series III, Metric
Dated: 11 August 2022
File name: dtl38999ss21.pdf, File Size: 175 kb

Connectors, Electrical, Circular, Threaded, Receptacle, Box Mounting Flange, Hermetic, Hermetic Solder Contacts, Series III, Metric
Dated: 22 August 2025
File name: iddtl38999ss21.pdf, File Size: 340 kb

Connectors, Electrical, Circular, Receptacle, Threaded, Dummy Stowage, Series III, Metric
Dated: 11 August 2022
File name: dtl38999ss22.pdf, File Size: 371 kb

Connectors, Electrical, Circular, Receptacle, Threaded, Dummy Stowage, Series III, Metric
Dated: 22 August 2025
File name: iddtl38999ss22.pdf, File Size: 577 kb

Connectors, Electrical, Circular, Threaded, Receptacle, Jam-Nut Mounting, Hermetic, Hermetic Solder Contacts, Series III, Metric
Dated: 11 August 2022
File name: dtl38999ss23.pdf, File Size: 158 kb

Connectors, Electrical, Circular, Threaded, Receptacle, Jam-Nut Mounting, Hermetic, Hermetic Solder Contacts, Series III, Metric
Dated: 22 August 2025
File name: iddtl38999ss23.pdf, File Size: 366 kb

Connectors, Electrical, Circular, Receptacle, Threaded, Jam-Nut Mounting, Removable Crimp Contacts, Series III, Metric
Dated: 11 August 2022
File name: dtl38999ss24.pdf, File Size: 142 kb

Connectors, Electrical, Circular, Receptacle, Threaded, Jam-Nut Mounting, Removable Crimp Contacts, Series III, Metric
Dated: 22 August 2025
File name: iddtl38999ss24.pdf, File Size: 325 kb

Connector, Electrical, Circular, Threaded, Receptacle, Solder Mounting, Hermetic, Hermetic Solder Contacts, Series III, Metric
Dated: 02 July 2024
File name: dtl38999ss25.pdf, File Size: 104 kb

Connector, Electrical, Circular, Threaded, Receptacle, Solder Mounting, Hermetic, Hermetic Solder Contacts, Series III, Metric
Dated: 22 August 2025
File name: iddtl38999ss25.pdf, File Size: 312 kb

Connectors, Electrical, Plug, Circular, Threaded, Straight, Removable Crimp Contacts, Series III, Metric
Dated: 11 August 2022
File name: dtl38999ss26.pdf, File Size: 89 kb

Connectors, Electrical, Plug, Circular, Threaded, Straight, Removable Crimp Contacts, Series III, Metric
Dated: 22 August 2025
File name: iddtl38999ss26.pdf, File Size: 270 kb

Connectors, Electrical, Circular, Threaded, Receptacle, Weld Mounting, Hermetic, Hermetic Solder Contacts, Series III, Metric
Dated: 22 August 2025
File name: iddtl38999ss27.pdf, File Size: 336 kb

Connectors, Electrical, Circular, Nut, Hexagon, Connector Mounting, Series III and IV, Metric
Dated: 11 August 2022
File name: dtl38999ss28.pdf, File Size: 115 kb

Connectors, Electrical, Circular, Nut, Hexagon, Connector Mounting, Series III and IV, Metric
Dated: 22 August 2025
File name: iddtl38999ss28.pdf, File Size: 294 kb

Connectors, Electrical, Circular, Threaded, Plug, Lanyard Release, Fail-Safe, Removable Crimp Contacts, Pins, Series III, Metric
Dated: 11 August 2022
File name: dtl38999ss29.pdf, File Size: 127 kb

Connectors, Electrical, Circular, Threaded, Plug, Lanyard Release, Fail-Safe, Removable Crimp Contacts, Pins, Series III, Metric
Dated: 22 August 2025
File name: iddtl38999ss29.pdf, File Size: 311 kb

Connectors, Electrical, Circular, Threaded, Plug, Lanyard Release, Fail-Safe, Removable Crimp Contacts, Sockets, Series III, Metric
Dated: 11 August 2022
File name: dtl38999ss30.pdf, File Size: 127 kb

Connectors, Electrical, Circular, Threaded, Plug, Lanyard Release, Fail-Safe, Removable Crimp Contacts, Sockets, Series III, Metric
Dated: 22 August 2025
File name: iddtl38999ss30.pdf, File Size: 310 kb

Connectors, Electrical, Circular, Threaded, Plug, Lanyard Release, Fail-Safe, Removable Crimp Contacts, Sockets, Shell Size 25, Series III, Metric
Dated: 11 August 2022
File name: dtl38999ss31.pdf, File Size: 265 kb

Connector, Electrical Circular, Cover, Protective, Plug, Series III, Metric
Dated: 11 August 2022
File name: dtl38999ss32.pdf, File Size: 145 kb

Connector, Electrical Circular, Cover, Protective, Receptacle, Series III, Metric
Dated: 11 August 2022
File name: dtl38999ss33.pdf, File Size: 215 kb

Connectors, Receptacle, Electrical, Circular, Breakaway Jamnut Mounting, Removable Crimp Contacts, Sockets, Series III, Shell Size 25, Metric
Dated: 02 July 2024
File name: dtl38999ss34.pdf, File Size: 133 kb

Connectors, Receptacle, Electrical, Circular, Breakaway Wall Mounting Flange, Removable Crimp Contacts, Sockets, Series III, Shell Size 25, Metric
Dated: 02 July 2024
File name: dtl38999ss35.pdf, File Size: 105 kb

Connectors, Electrical, Circular, Threaded, Plug, Lanyard Release, Fail-Safe, Removable Crimp Contacts, Pins, Shell Size 25, Series III, Metric
Dated: 02 July 2024
File name: dtl38999ss36.pdf, File Size: 454 kb

Connectors, Electrical, Circular, Receptacle, Wall Mounting Flange, Breech Coupling, Removable Crimp Contacts, Series IV, Metric
Dated: 10 March 2020
File name: dtl38999ss40.pdf, File Size: 80 kb

Connectors, Electrical, Circular, Receptacle, Box Mounting Flange, Hermetic, Breech Coupling, Hermetic Solder Contacts, Series IV, Metric
Dated: 02 July 2024
File name: dtl38999ss41.pdf, File Size: 102 kb

Connectors, Electrical, Circular, Receptacle, Box Mounting Flange, Breech Coupling, Removable Crimp Contacts, Series IV, Metric
Dated: 10 March 2020
File name: dtl38999ss42.pdf, File Size: 110 kb

Connectors, Electrical, Circular, Receptacle, Jam Nut Mounting, Hermetic, Breech Coupling, Hermetic Solder Contacts, Series IV, Metric
Dated: 02 July 2024
File name: dtl38999ss43.pdf, File Size: 113 kb

Connectors, Electrical, Circular, Receptacle, Jam-Nut Mounting, Breech Coupling, Removable Crimp Contacts, Series IV, Metric
Dated: 02 July 2024
File name: dtl38999ss44.pdf, File Size: 147 kb

Connectors, Electrical, Circular, Receptacle, Solder Mounting, Hermetic, Breech Coupling, Hermetic Solder Contacts, Series IV, Metric
Dated: 02 July 2024
File name: dtl38999ss45.pdf, File Size: 108 kb

Connectors, Electrical, Circular, Plug, Breech Coupling, EMI Grounding, Removable Crimp Contacts, Series IV, Metric
Dated: 10 March 2020
File name: dtl38999ss46.pdf, File Size: 81 kb

Connectors, Electrical, Circular, Plug, Breech Coupling, Removable Crimp Contacts, Series IV, Metric
Dated: 10 March 2020
File name: dtl38999ss47.pdf, File Size: 98 kb

Connectors, Electrical, Circular, Receptacle, Weld Mounting, Hermetic, Breech Coupling, Hermetic Soler Contacts, Series IV, Metric
Dated: 02 July 2024
File name: dtl38999ss48.pdf, File Size: 80 kb

Connectors, Electrical, Circular, Receptacle, in Line Cable, Breech Coupling, Removable Crimp Contacts, Series IV, Metric
Dated: 02 July 2024
File name: dtl38999ss49.pdf, File Size: 106 kb

Connectors, Electrical, Circular, Receptacle, Dummy Stowage, Breech Coupling, Series IV, Metric
Dated: 02 July 2024
File name: dtl38999ss50.pdf, File Size: 101 kb

Connector, Electrical, Circular, Cover, Protective, Plug, MIL-DTL-38999 Series IV
Dated: 02 July 2024
File name: dtl38999ss51.pdf, File Size: 138 kb

Connector, Electrical Circular, Cover, Protective, Receptacle, MIL-DTL-38999 Series IV
Dated: 02 July 2024
File name: dtl38999ss52.pdf, File Size: 145 kb

Connectors, Electrical, Plug, Circular, Threaded, Straight, Removable Crimp Contacts, Fiber Optic Termini, Tight Tolerance, Series III, Shell Size 25, Metric
Dated: 20 September 2019
File name: dtl38999ss60.pdf, File Size: 131 kb

Connectors, Electrical, Circular, Receptacle, Threaded, Wall Mounting Flange, Removable Crimp Contacts, Fiber Optic Termini, Tight Tolerance, Series III, Shell Size 25, Metric
Dated: 20 September 2019
File name: dtl38999ss61.pdf, File Size: 99 kb

Sealing Boot, Size 8, Pin or Socket, Shielded Crimp Contacts, Electrical Connector, Circular, Metric
Dated: 02 July 2024
File name: dtl38999ss62.pdf, File Size: 115 kb

Adapter, Electrical Connector, Series I and II
Dated: 08 February 2008
File name: ms27342.pdf, File Size: 87 kb

Connector, Receptacle, Electrical, Wall Mounting Flange, Crimp Type, Bayonet Coupling, Series I
Dated: 27 August 2024
File name: ms27466.pdf, File Size: 136 kb

Connector, Plug, Electrical, Straight, Crimp Type, Bayonet Coupling, Series I
Dated: 27 August 2024
File name: ms27467.pdf, File Size: 85 kb

Connectors, Receptacle, Electrical, Jam Nut Mounting, Crimp Type, Bayonet Coupling, Series I
Dated: 27 August 2024
File name: ms27468.pdf, File Size: 182 kb

Connector, Receptacle, Electrical, Wall Mounting Flange, Solder Type, Hermetic Seal, Series I
Dated: 27 August 2024
File name: ms27469.pdf, File Size: 143 kb

Connector, Receptacle, Electrical, Jam Nut Mounting, Solder Type, Hermetic Seal, Series I
Dated: 27 August 2024
File name: ms27470.pdf, File Size: 202 kb

Connector, Receptacle, Electrical, Solder Mounting, Solder Type, Hermetic Seal, Series I
Dated: 27 August 2024
File name: ms27471.pdf, File Size: 113 kb

Connector, Receptacle, Electrical, Wall Mounting Flange, Crimp Type, Bayonet Coupling, Series II
Dated: 10 September 2024
File name: ms27472.pdf, File Size: 161 kb

Connector, Plug, Electrical, Straight, Crimp Type, Bayonet Coupling, Series II
Dated: 10 September 2024
File name: ms27473.pdf, File Size: 139 kb

Connector, Receptacle, Electrical, Jam Nut Mounting, Crimp Type, Bayonet Coupling, Series II
Dated: 10 September 2024
File name: ms27474.pdf, File Size: 222 kb

Connector, Receptacle, Electrical, Wall Mounting Flange, Solder Type, Hermetic Seal, Series II
Dated: 13 April 2012
File name: ms27475.pdf, File Size: 130 kb

Connector, Receptacle, Electrical, Box Mounting, Solder Type, Hermetic Seal, Series II
Dated: 10 September 2024
File name: ms27476.pdf, File Size: 171 kb

Connector, Receptacle, Electrical, Jam Nut Mounting, Solder Type, Hermetic Seal, Series II
Dated: 10 September 2024
File name: ms27477.pdf, File Size: 214 kb

Connector, Receptacle, Electrical, Solder Mounting, Solder Type, Hermetic Seal, Series II
Dated: 10 September 2024
File name: ms27478.pdf, File Size: 141 kb

Connector, Receptacle, Electric, Wall Mounting Flange, Crimp Type, Bayonet Coupling, Series II
Dated: 10 September 2024
File name: ms27479.pdf, File Size: 231 kb

Connector, Plug, Electric, Straight, Crimp Type, Bayonet Coupling, Series II
Dated: 10 September 2024
File name: ms27480.pdf, File Size: 209 kb

Connector, Receptacle, Electric, Jam Nut Mounting, Crimp Type, Bayonet Coupling, Series II (Cancellation Notice)
Dated: 27 June 2012
File name: ms27481not2.pdf, File Size: 19 kb

Connector, Plug, Electrical, Straight, Crimp Type, Bayonet Coupling, EMI, Series II
Dated: 29 October 2024
File name: ms27484.pdf, File Size: 195 kb

Connectors, Adapter, Electrical, Threaded, Kit, Straight and 90 Degrees, EMR Hardware, Series I and II (Cancellation Notice)
Dated: 05 February 2016
File name: ms27487not1.pdf, File Size: 17 kb

Connectors, Adapter, Electrical, Reducer, EMR Hardware, Series I and II (Cancellation Notice)
Dated: 06 August 2012
File name: ms27489.pdf, File Size: 16 kb

Connectors, Receptacle, Electrical, Box Mounting, Crimp Type, Bayonet Coupling, Series I
Dated: 29 October 2024
File name: ms27496.pdf, File Size: 156 kb

Connector, Receptacle, Electrical, Back Panel Wall Mounting Flange, Crimp Type, Bayonet Coupling, Series II
Dated: 29 October 2024
File name: ms27497.pdf, File Size: 175 kb

Connector, Receptacle, Electrical, Box Mounting Flange, Crimp Type, Bayonet Coupling, Series II
Dated: 29 October 2024
File name: ms27499.pdf, File Size: 99 kb

Connector, Plug, Electrical, 90 Deg. Elbow, Crimp Type, Bayonet Coupling, Series II
Dated: 29 October 2024
File name: ms27500.pdf, File Size: 156 kb

Connectors, Electrical, Circular, Cover, Protective, Plug, Bayonet Coupling, Series I
Dated: 29 October 2024
File name: ms27501.pdf, File Size: 163 kb

Connectors, Electrical, Circular, Cover, Protective, Receptacle, Bayonet Coupling, Series I
Dated: 29 October 2024
File name: ms27502.pdf, File Size: 96 kb

Connector, Receptacle, Electric, Solder Mounting, Solder Type, Hermetic Seal, Series II
Dated: 04 May 1990
File name: ms27503.pdf, File Size: 130 kb

Connector, Receptacle, Electric, Box Mounting Flange, Crimp Type, Bayonet Coupling, Series II (Cancellation Notice)
Dated: 27 June 2012
File name: ms27504not2.pdf, File Size: 16 kb

Connector, Receptacle, Electrical, Back Panel, Box Mounting Flange, Crimp Type, Bayonet Coupling, Series I
Dated: 29 October 2024
File name: ms27505.pdf, File Size: 117 kb

Connector, Receptacle, Electrical, Back Panel Box Mounting Flange, Crimp Type, Bayonet Coupling, Series II
Dated: 12 September 2019
File name: ms27508.pdf, File Size: 117 kb

Connectors, Electrical, Circular, Cover, Protective, Plug, Bayonet Coupling, Series II
Dated: 27 June 2025
File name: ms27510.pdf, File Size: 233 kb

Covers, Protective, Electrical, Connector Receptacle, Bayonet Coupling, Series II
Dated: 27 June 2025
File name: ms27511.pdf, File Size: 172 kb

Connectors, Electrical, Circular, Nut, Hexagon, Connector Mounting, for MIL-DTL-38999, Series II, and MIL-DTL-27599, Series II
Dated: 27 June 2025
File name: ms27512.pdf, File Size: 89 kb

Connector, Receptacle, Electrical, Box Mounting Flange, Extended Grommet, Crimp Type Bayonet Coupling, Series II
Dated: 27 June 2025
File name: ms27513.pdf, File Size: 123 kb

Nut, Slotted, Hexagon Connector Mounting, Series I
Dated: 26 July 1990
File name: ms27514.pdf, File Size: 84 kb

Connector, Receptacle, Electric, Crimp Type, Back Panel Wall Mounting Flange, Series I
Dated: 27 June 2025
File name: ms27515.pdf, File Size: 175 kb

Connector, Receptacle, Electric, Wall Mounting Flange, Crimp Type, Bayonet Coupling, Series I
Dated: 27 June 2025
File name: ms27652.pdf, File Size: 176 kb

Connector, Plug, Electric, Straight, Crimp Type, Bayonet Coupling, Series I
Dated: 27 June 2025
File name: ms27653.pdf, File Size: 167 kb

Connector, Receptacle, Electric, Back Panel Wall Mounting Flange, Crimp Type, Bayonet Coupling, Series I
Dated: 27 June 2025
File name: ms27654.pdf, File Size: 177 kb

Connectors, Receptacle, Electrical, Back Panel Wall Mounting Flange, Crimp Type, Bayonet Coupling, Series I
Dated: 27 June 2025
File name: ms27656.pdf, File Size: 117 kb

Connector, Plug, Electrical, Crimp Type, Lanyard Release, Fail-Safe, Series I
Dated: 27 June 2025
File name: ms27661.pdf, File Size: 123 kb

Connector, Receptacle, Electrical, Thru-Bulkhead Mounting, Bayonet Coupling, Series I
Dated: 27 June 2025
File name: ms27662.pdf, File Size: 113 kb


Related Items







Comments or questions: VaWebTeam@dla.mil