Part Number Explanation: MIL-DTL-38999 Series II
MS27472T18B35PA
Below are the explanations for each or the coloured sections of the above part number.
Shell Type
| Code |
Description |
Available Class |
| MS27472 |
Wall Mount Receptacle |
E*,P,T |
| MS27473 |
Straight Plug |
E*,P,T |
| MS27474 |
Jam Nut Receptacle |
E*,P,T |
| MS27475 |
Hermetic Wall Mount Receptacle |
Y |
| MS27476 |
Hermetic Box Mount Receptacle |
Y |
| MS27477 |
Hermetic Jam Nut Receptacle |
Y |
| MS27478 |
Hermetic Solder Mount Receptacle |
Y |
| MS27479 |
Superseded by MS27472 |
E*,T |
| MS27480 |
Superseded by MS27473 |
E*,T |
| MS27481 |
Superseded by MS27474 |
E*,T |
| MS27482 |
Superseded by MS27475 |
Y |
| MS27483 |
Superseded by MS27477 |
Y |
| MS27484 |
Straight Plug, EMI grounding |
E*,P,T |
| MS27497 |
Wall Mount Receptacle, back panel mounting |
E*,P,T |
| MS27499 |
Box Mount Receptacle |
E |
| MS27500 |
Superseded by MS27473 with MS85049/47 backshell |
E |
| MS27503 |
Superseded by MS27478 |
Y |
| MS27504 |
Superseded by MS27499 |
E* |
| MS27508 |
Box Mount Receptacle, back panel mounting |
E |
| MS27513 |
Box mount receptacle, long grommet |
E |
| MS27664 |
Superseded by MS27497 |
E*,T |
| *Inactive for new design. Use Class T. |
Class
| Class Code |
Description |
| E |
Environmental, may or may not have teeth or rear of shell. Current for MS27496, MS27505, and MS27662. Inactive for new design for all others. Use Class T. |
| P |
Potting, includes potting boot and short rear grommet. Inactive for new Air Force design. |
| T |
Environmental, with teeth on rear of shell, less rear hardware. |
| Y |
Hermetic |
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 |
View MIL-DTL-38999 Inserts
Material & Finish
| Class |
Material |
Finish |
Temp Range |
| A |
Aluminium |
Bright or gold cadmium over nickel |
-65°C to +150°C |
| B |
Aluminium |
Olive drab cadmium over nickel |
-65°C to +175°C |
| C |
Aluminium |
Non-conductive anodise |
-65°C to +200°C |
| D |
Steel |
Fused tin, class Y only |
-65°C to +150°C |
| E |
Stainless steel |
Passivated, class Y only |
-65°C to +200°C |
| F |
Aluminium |
Electroless nickel |
-65°C to +200°C |
| N |
Stainless steel |
Electro deposited nickel |
-65°C to +200°C |
Contact Arrangement
View MIL-DTL-38999 Inserts
Contact Style
| A |
Less pin contacts |
| B |
Less socket contacts |
| 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
