Red insulated spade for 16-22 AWG
The 1-1377173-4 is the red-coded member of TE's Plasti-Grip spade terminal line, accepting 16-22 AWG wire and fitting a #4 stud. The tin-plated copper contact is crimp-terminated and free-hanging (in-line), with a serrated termination that bites through oxide for a consistent connection.
