MIL-C 38999 Series I,II,III,IV

Materials

	Shell Normal - Aluminium alloy, plated olive drab cadmium, black anodized or nickel. Hermetic - Steel, stainless steel & passivate or nickel. Sizes - Series II - 08, 10, 12, 14, 16, 20, 24. Series I & III - 09, 11, 13, 15,17, 19, 21, 23, 25
	Insulator Normal - Thermoplastic fluoronated silicone elastomer. Hermetic - Sintered glass insert.
	Contacts - Gold or gold/tin lead over copper alloy or nickel. Crimp / PC tail ~ 3 to 128 Male or Female. Accept 12 to 28 AWG terminating wire sizes
	Coaxial contact # 8 for RG 180B/U, RG 195A/U

Electrical

Current

Size	Normal	Hermetic	Volt drop
22D	5.0A	3.0A	73 millivolt max
20	7.5A	5.0A	55 millivolt max
16	13.0A	10.0A	49 millivolt max
12	23.0A	17.0A	42 millivolt max

Test voltage V rms

Service	Sea level	21000m	Unmated
M	1300	800	350
I	1800	1000	400
II	2300	1000	500

Contact Resistance

22D	14.6 m
20	7.3 M
16	3.8 M
12	1.7 M

Insulation Resistance - > 5,000 M

at 500 Vdc

Shielding 90 dB to 100 MHz.
50 dB to 10,000 MHz.

Mechanical

	Contact to insulator holding force. 22D - 45 N 8 - 110 N
	Mechanical operations - 500 Min
	Vibration: - sine 10 to 2000Hz 30g. - random 100 to 300 Hz 5 g²/Hz.
	Physical shocks - 300g. 3ms in the 3 axes

Environmental

	Working temperature : Cadmium plated -55 to +125ºC. Nickel plated -65 to +200ºC.
	Resistance to salt spray: Normal plating 500 hours per. MIL-STD 1344 method 1001, test B & NFC 93422. Nickel plated - 48 hours.
	Damp Heat: MIL-C-38999 - 10 cycles 24 hours.
	Sealing: Mated connector < 16 cm/hr under a differential pressure of 2.1 bar.
	Thermal shock: as MIL-C 38999 para. 3-7, 3-8.

Types

	Series 1 MS 27466 - Wall mount receptacle MS 27467 - Straight plug with EMI grounding MS 27468 - Jam nut receptacle MS 27469Y - Hermetic wall mount receptacle MS 27470Y - Hermetic jam nut receptacle MS 27471Y - Hermetic solder mount receptacle MS 27496E - Box mount receptacle MS 27505E - Box mount receptacle, rear panel mounting MS 27656 - Wall mount receptacle, rear panel mounting MS 27661 - Straight plug, lanyard release MS 27662E - Through bulkhead receptacle
	Series 2 MS 27472 - Wall mount receptacle MS 27473 - Straight plug MS 27474 - Jam nut receptacle MS 27475Y - Hermetic wall mount receptacle MS 27476Y - Hermetic box mount receptacle MS 27477Y - Hermetic jam nut receptacle MS 27478Y - Hermetic solder mount receptacle MS 27497 - Wall mount receptacle, back panel mounting MS 27499E - Box mount receptacle MS 27508E - Box mount receptacle, back panel mounting MS 27513E - Box mount receptacle, long grommet
	Series 3 D38999_20 - Wall mount receptacle D38999_21 - Hermetic sealed box mount receptacle D38999_23 - Hermetic sealed jam nut receptacle D38999_24 - Jam nut receptacle D38999_25 - Hermetic sealed solder mount receptacle D38999_26 - Straight plug D38999_27 - Hermetic sealed weld mount receptacle D38999_29 - Lanyard release plug, pin contacts D38999_30 - Lanyard release plug, socket contacts
	Series 4 D38999_40 - Wall mount receptacle D38999_41 - Hermetic box mount receptacle D38999_42 - Box mount receptacle D38999_43 - Hermetic jam nut receptacle D38999_44 - Jam nut receptacle D38999_45 - Hermetic solder mount receptacle D38999_46 - Straight plug with EMI grounding D38999_47 - Straight plug D38999_48 - Hermetic weld mount receptacle D38999_49 - In-line receptacle

MIL-C 38999 Connector

Standard and High Density, multi-pin, lightweight, miniature military circular connectors.

For all military and aeronautical purposes, tactical missiles, fighting vehicles. instrumentation (Series II) and control, etc.

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°C to +200°C.

All series include rear release removable pin and socket contacts with crimp termination. All series are designed to assure proper orientation of the mating halves prior to electrical circuit closure. All series include hermetically sealed receptacles with fixed contacts for solder termination. All series include EMI shielding capability. Series I, III, and IV connectors with conductive finishes provide electrical continuity between mated shells prior to contact engagement and have the contacts so located as to be protected from handling damage and inadvertent electrical contact. Series II provides low silhouette for minimum size and weight and includes connectors which provide shell-to-shell electrical continuity when mated

Series I	High Density bayonet connectors, "scoop proof" crimp rear release contacts.
Series II	Bayonet connectors, "low profile", crimp rear release contacts.
Series III	Triple start thread "vibration resist" connectors, crimp rear release contacts. "Scoop proof" with 'Metric' accessory threads for greater strength and support of backshells.
Series IV	Breech lock, quick disconnect connectors, crimp rear release.
The above four Series are NOT intermateable with each other. Download MIL-C 38999 Data Sheet

Features

Conform to MIL-C-38999

BS9520 G0003

Quick disconnect bayonet or triple thread coupling for positive mating in 360º turn.

9 shell sizes,
Series I & III - 9 through 25
Series II - 8 through 24

Positive metal to metal coupling for excellent EMI shielding

Locksmith keying orientation (machined into shell)

Crimp contacts to MIL-C-39029, sizes 22D, 20, 16 & 12

Up to 128 contacts (22D)

All Series share common insert arrangements accepting mixed layout or coaxial/triaxial contacts

Fluorosilicone interfacial 'environmental' seal between contacts and shell

Chamfered conical entry to interfaces to aid proper mating of contacts

Filtered types available.

D38999 connectors are also available in a wide range of finishes and shell materials including anodic, zinc cobalt, aluminum, electroless nickel, olive drab cadmium and more.

An extensive range of Backshells to suit D38999 connectors are available to order seperately

FURTHER INFORMATION

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