Crimp termination, insulated ring
The 2-36161-5 is a PIDG-series ring terminal from TE Connectivity AMP Connectors, accepting 12 AWG wire for a #6 stud in a free-hanging crimp assembly. The tin-plated copper contact is 0.039" (0.99mm) thick; the yellow polyamide insulation sleeve covers the crimp barrel and part of the wire, with an insulation restriction that prevents the jacket from slipping under the contact.
