You Ain't Gonna Use "Blue" Connectors With 12 AWG Wire.
Unless there are a dozen little tiny strands of copper "trim" around the work site.
With 12 "SAE" wire it is possible (depending on stranding) to jam it into some "blue" terminals depending on manufacture.
American Wire Gauge is the "Holy Grail" of USA graded wire. It does not vary. The law SHOULD BE enforced that says the Chinese and their crooked US clients should face prison terms for knowingly using sub-size millimeter "substitution" for AWG. With SAE, the rules are looser than a goose.
