Ring terminal for 12–14 AWG, 1/4 stud
The 1577641-1 is a PIDG and Strato-Therm ring terminal from TE Connectivity AMP Connectors, accepting 12-14 AWG wire on a 1/4 stud. The terminal is insulated with PEEK, carries a nickel-plated copper contact with serrated termination, and measures 0.032" (0.81mm) thick.
Non-insulated Solistrand siblings differ in stud size and wire range
The 1577641-1 is an insulated terminal; the Solistrand 1377172-9 shares the 1/4 stud and 0.469" (11.91mm) outer width but is non-insulated, accepts 14-16 AWG, and uses a tin finish. For a smaller stud, the 1377172-7 (8 stud, 0.343" width) and the 133521-1 (8 stud, 0.281" width) are non-insulated Solistrand terminals with different wire ranges.