MIL-DTL-38999 (MIL-C-38999) Series I
High Density bayonet connectors, “scoop proof” crimp rear release contacts. MIL-DTL-38999 Series I Connectors are a bayonet coupling subminiature configuration with high contact density for harsh-environment applications. These environment-resisting connectors are 100% scoop-proof. Pins are recessed in elongated shells to prevent the possibility of bending contacts when plugs are scooped into the mating receptacles.
MIL-DTL-38999 (MIL-C-38999) Series II
Bayonet connectors, “low profile”, crimp rear release contacts. These connectors were designed for military and commercial applications where the prime requirements are lower profile and lighter weight. Reduction of both size and weight is achieved through the use of thinner shell walls and shorter bodies. These design restrictions reduce the RFI attenuation characteristics and eliminate the scoop protection, but produce an excellent general-purpose, lightweight connector. Compared with MIL-C-38999 Series I, Series II connectors achieved up to 20% reduction in mated pair length, up to 39% reduction in outside diameter and up to 40% reduction in weight
MIL-DTL-38999 (MIL-C-38999) Series III
Triple start thread “vibration resist” connectors, crimp rear release contacts. “Scoop proof” with ‘Metric’ accessory threads for greater strength and support of backshells.
MIL-DTL-38999 (MIL-C-38999) Series IV
Breech lock, quick disconnect connectors, crimp rear release. Breech-Lok, Series IV connectors feature a coupling mechanism that only requires 90° of rotation to engage and disengage. This rugged design distributes the coupling load over solid-metal lands while internal-drive threads provide the mechanical advantage needed to ensure positive engagement of the contacts and interfacial seals.
The above four Series are NOT intermateable with each other.
Amphenol have introduced the High Density HD38999 family of connectors to work with existing mil-specified 38999 shells. To end users familiar with standard 38999 connectors, this family of high density connectors will look, feel, and perform just like the mil-qualified connectors. Utilizing an existing mil-qualified 39029 size 23 contact and mil-qualified shells, the new system is usually a drop-in connector. Even though the HD38999 has 30% more contacts, it still performs to minimum electrical requirements of standard 38999 connectors. HD38999 are available with from 9 to 187 contacts.