MIL-DTL-38999 Series I Jam Nut Receptacle (Shell 25, 61× #20)

Specifications

Cross-Reference

Overview

The MS27468T25B61S is a MIL-DTL-38999 Series I ms27468 jam nut receptacle with a shell size 25 shell and insert arrangement 25-61, which carries 61 × #20 (7.5 A each) on a socket insert. Series I is the original 38999 design: a three-point bayonet coupling ring with an audible, visual and tactile lock, a scoop-proof plug shell that protects the receptacle pins during a misaligned mating attempt, and EMI grounding fingers on the plug as standard. Shell size letters A through J map to shell sizes 9, 11, 13, 15, 17, 19, 21, 23 and 25.

The connector is rated from -65°C to +200°C and is qualified to 500 mating cycles, with removable crimp contacts that are rear-insertable and rear-releasable so the front insert face is never touched by service tooling. The finish code B is olive drab cadmium over nickel, the standard high-corrosion military finish; the service class T designation means an environmental connector supplied without a backshell, so a separate cable clamp or strain-relief backshell is ordered separately. Contact details follow the MIL-STD-1560 insert-arrangement tables: the arrangement number identifies the shell size and the mix of contact sizes.

Mechanical and environmental performance follows MIL-DTL-38999: 5000 MΩ minimum insulation resistance at 500 VDC, vibration and shock per the detail specification, and a fluid-resistant resilient insert. All six polarization options (normal plus A, B, C, D and E alternate key positions) are available on this shell size to prevent cross-mating between adjacent connectors carrying different circuits.

Applications

Avionics and aircraft engine-bay harnesses, missile and ground-support equipment, armoured-vehicle and naval electronics, radar and EW subsystems, industrial robotics and motion-control cabling that needs a scoop-proof, vibration-rated circular interface, and any application retrofitting a MIL-C-38999 Series I / MIL-C-27599 footprint.