CIRCULAR CONNECTOR

MIL-DTL-38999

The 38999 series style connector has each property in 3 divisions. This is a connector mainly used in aerospace equipment, special communication equipment, etc. requiring electrical, mechanical and environmental properties of high reliability. Connectors can accommodate the highest density of contacts and feature the most comprehensive selection of contacts, including fiber optic, twinax, coax, quadrax, and PC tail contacts.

Isotec's one of specialties is assembly of military cables with variety of 38999 series I & series III connectors and we have several years of experience assembling custom military cables for our customers both in Korean and U.S.A market.

Ordering Information

Military Nomenclature



° MS Number Shell Style MS27466 - Wall Mounting Receptacle MS27467 - Grounded Plug, Grounded MS27468 - Jam Nut Receptacle MS27656 - Wall Mounting Receptacle (back panel)(Class E) ° Class E - Inactive for new design. Superseded by Class T. T - Environment - resistant with accessory threads and teeth. ° Shell Size 9, 11, 13, 15, 17, 19, 21, 23, and 25 ° Contact Arrangement MIL-STD-1560A	° Hardware Finish A - Silver to light iridescent color cadmium plate over nickel, -65℃ to +150℃ (-85℃ to +302℃) B - Olive drab cadmium over electroless nickel plate, -65℃ to +175℃ (-85℃ to +347℃) F - Electroless nickel coating, -65℃ to +200℃ (-85℃ to 392℃) ° Contact Style P - Pin S - Socket A - Less Pin Contact* B - Less Socket Contact* * Used only when other than power contacts are to be installed (i.e., shielded, thermocouple, etc.) ° Polarizing Position A, B, C, and D. (No letters required for normal) Note : To order MS connectors less standard power contacts, purchase order must state "Less Contacts".

Technical Data

Standard Materials and Finishes


	Receptacle	Grounded Plug

Shell	Aluminum alloy	Aluminum alloy*

Insulator	High grade plastic	High grade plastic

Contacts	Copper allot, gold plate	Copper allot, gold plate

Grommet and Seal	Silicon bass elastomer	Silicon bass elastomer

Jam Nut	Aluminum alloy	-

Coupling	-	Aluminum alloy

Grounding Spring	-	Beryllium copper

* Finish as noted in how to order sections.

Contact Rating and Wire Size Accommodation								Service Rating
Wire Size	Contact Size and Test Amps							Altitude	Service	Rating M	Service	Rating M	Service	Rating M	Service	Rating M
Wire Size	22D	22M*	22*	20	16	12	10	Altitude	Mated	Unmated	Mated	Unmated	Mated	Unmated	Mated	Unmated
28	1.5	1.5	-	-	-	-	-	Sea Level	1300	1300	1000	1000	1800	1800	2300	2300
26	2.0	2.0	2.0	-	-	-	-	50,000 ft.	800	550	600	400	1000	600	1000	800
24	3.0	3.0	3.0	3.0	-	-	-	70,000 ft.	800	350	600	260	1000	400	1000	500
22	5.0	-	5.0	5.0	-	-	-	100,000 ft.	800	200	600	200	1000	200	1000	200
20	-	-	-	7.5	7.5	-	-
18	-	-	-	-	10.0	-	-
16	-	-	-	-	13.0	-	-
14	-	-	-	-	-	17.0	-
12	-	-	-	-	-	23.0	-
10	-	-	-	-	-	23.0	33.0

* For reference only Test Voltage, AC(rms)