MS3126F20-16S is a MIL-C-26482 Series I miniature circular straight plug connector designed for military and industrial applications requiring quick-disconnect capability with environmental resistance. This KPSE-series connector features Class F configuration with grommet seal and strain relief, shell size 20, contact arrangement 20-16 with 16 size #16 contacts, and socket (S) contact style with crimp snap-in termination. The connector supports wire sizes from AWG 16 to 24 and offers service rating II with maximum operating voltage of 1000V AC (rms) or 1275V DC at sea level. Key dimensional specifications include shell diameter of 1.248 inches (31.70 mm) and thread size 1-3/16-18UNEF. These connectors are widely used in aerospace, defense, and industrial applications where reliable electrical connections with environmental sealing are required.