PT07A-12-3S is a jam nut receptacle connector designed to meet MIL-DTL-26482 Series I specifications, featuring a shell size 12 with 3 total contacts in a 12-3 layout configuration. The connector utilizes crimp contacts (PT-SE type) compatible with AWG 12 and 14 wire sizes, with insulation outside diameter limits ranging from 0.097 inches (2.46 mm) minimum to 0.142 inches (3.61 mm) maximum. It incorporates an aluminum alloy shell with rugged construction, quick-disconnect bayonet coupling for rapid mating and unmatting, and operates reliably across a temperature range of -55°C to +125°C. The connector meets stringent sealing requirements including 48-hour submersion in 6 feet of water per MIL-DTL-26482 4.6.14 and humidity testing per MIL-STD-1344. This receptacle is ideal for power generators, industrial machinery, telecommunications, sensors, and mobile equipment applications requiring robust, interchangeable circular connectors.