MIL-DTL-38999 III D38999/26FB98SN Anti Electromagnetic Interference/Waterproof | Suitable for Military Communication Equipment

Previously known as MIL-C-38999, MIL-DTL-38999 connectors come in four series: Series I, Series II, Series III and Series IV. They are environmentally resistant connectors that use removable crimp contacts and have an operating range of -65 to +200°C.

Series I connectors are bayonet coupled and have high-vibration properties. They are scoop proof and are ideal for heavy wind and moisture environments. They are utilised when a fast disconnect coupling system is required.

Series II connectors are bayonet coupled, are non-scoop proof, and have a low profile, so are used when weight or space is limited, or in low-vibration, high moisture, and strong wind situations.

Series III connectors are coupled by a quick screw Tri start thread, are scoop proof, and are best suited for normal mating and unmating applications and can be used in high temperature, moisture, wind, or vibration environments when used with the correct accessories. Series III connectors are most commonly use in Military and Aerospace designs.

Series IV connectors are coupled by a Breech-Lok mechanism, are scoop proof, lightweight and suitable for blind mating applications, and they also have high-vibration attributes. They are well suited in high wind and moisture environments when used with the appropriate accessories.

Shell Type

Series III		Series IV		Shell Type Description
	D38999/20		D38999/40	Receptacle, Wall Mount Flange
	D38999/21		D38999/41	Receptacle, Box Mount, Hermetic
	–		D38999/42	Receptacle, Box Mount
	D38999/23		D38999/43	Receptacle, Jam Nut Mount, Hermetic
	D38999/24		D38999/44	Receptacle, Jam Nut Mount
	D38999/25		D38999/45	Receptacle, Solder Mount, Hermetic
	D38999/26		D38999/46	Plug, EMI Grounding Fingers
	–		D38999/47	Plug
	D38999/27		D38999/48	Receptacle, Weld Mount, Hermetic

Shell types 26, 46 and 47 are plugs. All other shells are receptacles. Odd numbered receptacle shell types denote hermetic construction: 21, 23, 25, 27, 41, 43 and 45.

Examples of different D38999 shell styles

Material and Finish

Code	Image	Material	Finish
F		Aluminum	Electroless Nickel Plated (48-hr. Salt Spray)
G		Aluminum	Space-Grade Electroless Nickel (48-hr. Salt Spray)
H		Hermetic	Space Grade
J		Composite	Olive Drab Cadmium (2000-hr. Salt Spray)
K		Stainless Steel	Corrosion-Resistant Stainless Steel – Firewall (500-hr. Salt Spray)
L		Stainless Steel	Electrodeposited Nickel (48-hr. Salt Spray)
M		Composite	Electroless Nickel Plated (2000-hr. Salt Spray)
N		Hermetic	Stainless Steel, Nickel Plated
S		Stainless Steel	Nickel Plated (500-hr. Salt Spray)
T		Aluminum	Nickel PTFE (500-hr. Salt Spray)
W		Aluminum	Olive Drab Cadmium (500-hr. Salt Spray)
Y		Hermetic	Stainless Steel, Passivated
Z		Aluminum	Black Zinc Nickel (500-hr. Salt Spray)

Examples of D38999 finish materials

Shell Size

D38999 connectors are available in 9 shell sizes.

D38999 connector shell sizes: A, B, C, D, E, F, G, H ,J

Insert Arrangement

MIL-STD-1560 Insert Arrangements

Click on the insert arrangement to enlarge it. To find the layout of an inseret, look for the insert arrangement code under the shell size letter.

Connector Pin Counts

Shell Size and Insert Arrangements		Number of Pins
D38999 Series III	Service Rating	22D	20	16	12
A35	M	6
A98	I		3
B2	I			2
B4	I		4
B5	I		5
B35	M	13
B98	I		6
B99	I		7
C4	I			4
C8	I		8
C35	M	22
C98	I		10
D5	II			5
D15	I		14	1
D18	I		18
D19	I		19
D35	M	37
D97	I		8	4
E6	I				6
E8	II			8
E26	I		26
E35	M	55
E99	I		21	2
F11	II			11
F28	I		26	2
F30	I		29	1
F32	I		32
F35	M	66
F45	M	67
G11	I				11
G16	II			16
G24	I		24
G25	I		25
G27	I		27
G35	M	79
G39	I		37	2
G41	I		41
H21	II			21
H32	I		32
H34	I		34
H35	M	100
H36	I		36
H53	I		53
H55	I		55
H97	I			16
H99	II			11
J4	I		48	8
J19	I				19
J24	I			12	12
J29	I			29
J35	M	128
J43	I		23	20
J61	I		61

Shell Size and Insert Arrangements	Number of Pins
D38999 Series IV	22D	20	16	12	10
B5		5
B35	13
B98		6
B99		7
C4			4
C35	22
C98		10
D5			5
D18		18
D19	37	19
D35 ???
D97		8	4
E6				6
E8			8
E26		26
E35	55
F11			11
G41		41
H21			21
H35	100
H55		55
J4		48	8
J11		2			9
J19				19
J24			12	12
J29			29
J35	128
J43		23	20
J61		61
F32		32
F35	66
G11				11
G16			16
G35	79

Contact Type

Sealed Connectors

P	Pin
A	Less Pin
H	1500-Cycle Pin
S	Socket
B	Less Socket
J	1500-Cycle Socket

Hermetic Connectors

C	PC Tail Pin
D	PC Tail Socket
X	Eyelet Pin
Y	Eyelet Socket

Contact Color Codes

M39029 Contacts are used in D38999 connectors.

Keying Position

There are six distinct keying positions available for each shell size in the D38999 series of connectors: N, A, B, C, D and E. The keying position is indicated by the last letter in the part number. A plug will only mate with a receptacle with the same keying code. The following figure shows different keying positions for D38999/26FJ61P plug.

Having 6 different keying positions allows use of up to six D38999/26FJ61P plugs in the same space without the possibility of mating a plug with incorrect receptacle.