D38999/26FG35SN is a MIL-DTL-38999 Series III hermetic jam nut mount receptacle connector designed for demanding aerospace and military applications requiring sealed, reliable interconnections. The connector features CRES (corrosion-resistant steel) material with nickel plating and supports multiple shell sizes ranging from 11 to 25, with various contact termination options including solder cup, eyelet, and printed circuit board configurations. It incorporates a master keyway system for proper mating alignment and is qualified under MIL-DTL-38999 Rev. L specifications, including advanced 1000 Hour Grey™ Ni-PTFE plating for superior corrosion protection and EMC performance. The hermetic design with fluorosilicone seals ensures environmental protection in harsh land, sea, air, and space applications where moisture and contamination ingress must be prevented.