MIL-DTL-38999 Series III Coding Explained

Part Number Explanation: MIL-DTL-38999 Series III


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 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:

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.


View rotation angles (varies by insert)