The 53123-1 is a 14-16 AWG member of TE's Solistrand spade terminal line, terminated by crimp and accepting a #6 stud. Tin-plated phosphor bronze contact with a brazed seam and serrated termination — the serrations bite into the conductor strands during crimp for mechanical grip and electrical continuity.
Stud size and wire gauge across the series
The 53123-1 (14-16 AWG) sits between the 53120-1 (16-22 AWG) and the 53126-1 (10-12 AWG) in the Solistrand series — all three share the same #6 stud size, 0.250" (6.35mm) outer width, and tin-plated phosphor bronze construction, so the wire gauge is the selection axis.