PIDG ring terminal, 14-16 AWG, #8 stud
The 51864-5: The tin-plated copper contact is 0.031" (0.79mm) thick, insulated with blue nylon, and rated for free-hanging crimp termination.
Stud size and wire gauge across the series
Within the PIDG ring terminal family, the 51864-5 uses an #8 stud and 14-16 AWG wire, while the 51864-9 uses a #10 stud and 14 AWG wire — the 0.312" (7.92mm) outer width is shared, so the larger stud on the 51864-9 adds 0.062" (1.57mm) to overall length. The 2-36160-1 and 2-165655-1 also serve 14-16 AWG but with a #10 and M5 stud respectively; the 51864-5's #8 stud is the smallest in this group, suiting panels with #8 clearance holes.