Series IV · Breech coupling · Hermetic Weld Mount Receptacle · e.g. D38999/48YB35PN
D38999/48
MIL-DTL-38999 Series IV (breech-lok)
Weld Mount Receptacle, Hermetic
Weld mount, sealed by welding the shell into the housing
Glenair 234-100-H8
Deutsch DIV/40H weld (hermetic) · Souriau 8D hermetic · G&H/Cooper BL hermetic
Y = CRES passivated · N = CRES electrodeposited nickel · H = space grade
P pin solder cup · X pin eyelet · C pin PCB feedthrough · S socket solder cup · Z socket eyelet · D socket PCB feedthrough
B 11 · C 13 · D 15 · E 17 · F 19 · G 21 · H 23 · J 25
All MIL-STD-1560 arrangements (shared with Series III)
N normal plus A, B, C, D, K, L, M, R
Glass-fused insert, 1×10⁻⁷ cc/s He max leak rate
Corrosion-resistant steel shell, glass-to-metal sealed
-65 °C to +200 °C
Up to 45 dB at 10 GHz
90° quarter-turn breech-lok, visual / tactile / audible confirmation
D38999/46 and D38999/47 Series IV breech plugs
Not permitted on hermetic shells
MIL-DTL-38999 Series IV is the breech-lok variant of the D38999 family: instead of a threaded coupling nut it uses a 90° quarter-turn breech mechanism that gives visual, tactile and audible confirmation of full mate, with the mating force spread across a channeled metal flange. That makes it the preferred shell for missile, defense and aerospace equipment that must survive high shock and continuous vibration, where a threaded coupling can walk off.
The hermetic slash sheets take the standard Series IV shell and replace the elastomer interfacial seal with a glass-fused insert and a corrosion-resistant steel (CRES) shell. The result is a true metal-to-glass-to-metal seal rated at a maximum helium leak rate of 1×10⁻⁷ cc/s, which is what allows the connector to be used as a pressure or vacuum bulkhead rather than merely a splash-proof interface. Contact tails are solder cup, eyelet or PCB feedthrough, because a hermetic insert cannot accept a rear-release crimp contact.
D38999/48 is the weld mount receptacle, hermetic. It gives a weldable CRES shell for permanently sealed pressure and vacuum housings where no elastomer can be tolerated. Shell sizes run B through J (11 through 25) and every MIL-STD-1560 arrangement is supported, so the insert arrangement and contact count you already use on a Series IV environmental shell carries over unchanged.
Sample part number: D38999/48Y B 35 P N — slash sheet, then class, shell size, insert arrangement, contact style and polarization.
| Position | Code | Meaning |
|---|---|---|
| Base | D38999/48 | Weld Mount Receptacle, Hermetic |
| Class | N | Hermetic, CRES, electrodeposited nickel, conductive, -65 to +200 °C |
| Class | Y | Hermetic, CRES, passivated, conductive, -65 to +200 °C |
| Class | H | Hermetic, CRES, passivated, space grade |
| Shell Size | B C D E F G H J | Shell sizes 11, 13, 15, 17, 19, 21, 23, 25 |
| Insert Arrangement | B35, C35, D35, E35, G41, H21, J61, … | Per MIL-STD-1560 (shared with Series III) |
| Contact Style | P / X / C | Pin — solder cup / eyelet / PCB flex feedthrough |
| Contact Style | S / Z / D | Socket — solder cup / eyelet / PCB flex feedthrough |
| Polarization | N A B C D K L M R | N is normal (110° master key); alternates shift the keyway |
Need %s hermetic receptacles?
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