85107A2027SZ50 Circular Connector, 851 Series, Jam Nut Receptacle, 27 Contacts, Solder Socke. SOURIAU 851 Series connectors are used in a wide array of both commercial and military applications thanks to their ability to deliver a strong connection without compromising a lightweight, compact frame. These bayonet connectors meet MIL-DTL-26482 Series I requirements for environmental resistance and reliability