MIL-DTL-38999 Series III Coding Explained

Part Number Explanation: MIL-DTL-38999 Series III

D38999/20FA35PN

Below are the explanations for each or the coloured sections of the above part number.

Shell Type

Code	Description	Available Class
D38999/20	Wall Mount Receptacle	F,G,J,K,M,S,W
D38999/21	Hermetic seal box mount receptacle	H,N,Y
D38999/23	Hermetic seal jam nut receptacle	H,N,Y
D38999/24	Jam nut receptacle	F,G,J,K,M,S,W
D38999/25	Hermetic seal solder mount receptacle	H,N,Y
D38999/26	Straight plug, self locking	F,G,J,K,M,S,W
D38999/27	Hermetic seal weld mount receptacle	H,N,Y

Class

Class Code	Description	Material	Finish	Temp
C*	Environmental	Aluminium	Non-conductive anodise	200°C
F	Environmental	Aluminium	Electroless nickel	200°C
G	Environmental, space grade	Aluminium	Electroless nickel	200°C
H	Hermetic, space grade	Stainless steel	Electroless nickel	200°C
J	Environmental	Composite	Cadmium olive drab	175°C
K	Environmental Firewall	Stainless Steel	Electroless nickel	200°C
M	Environmental	Composite	Electroless nickel	200°C
N	Hermetic	Stainless steel	Electro deposited nickel	200°C
S	Environmental	Stainless steel	Electro deposited nickel	200°C
W	Environmental	Aluminium	Cadmium olive drab	175°C
Y	Hermetic	Stainless steel	Electroless nickel	200°C
*No Class C connectors in MIL-DTL-38999 Series III as of publication date.

Shell Size

The letters A to J must be use for the military part number. These correspond to shell sizes 9 to 25 as follows:

A	B	C	D	E	F	G	H	J
9	11	13	15	17	19	21	23	25

Contact Arrangement

View MIL-DTL-38999 Inserts

Contact Style

A	Less pin contacts
B	Less socket contacts
H	Pin contacts (1500 cycles)
J	Socket contacts (1500 cycles)
P	Pin contacts (500 cycles), crimp and hermetic with solder cups
S	Socket contacts (500 cycles), crimp and hermetic with solder cups
X	Pin with eyelet (hermetic only)
Z	Socket with eyelet (hermetic only)
Note	All shell types (receptacles and plugs) are available with either pin or socket contacts.

Polarisation

View rotation angles (varies by insert)