Sta-Kon RBT853 INS FLUOR RING TERM, 22-18, 1/4, CL

The RBT853 is a 1/4 inch ring terminal, so it lands on a 1/4-20 stud or a 1/4 inch screw at a terminal block, bus bar, or ground lug. If your stud is #10 or 5/16, this is the wrong ring size - the tongue hole will not seat correctly under the nut.

Yes, the RBT853 carries a 600 V rating, which covers standard commercial control wiring, panel terminations, motor control circuits, and line-voltage branch work. It is also UL recognized under file E9809.

Fluoropolymer insulation is the choice when the termination sees heat, solvents, or oils that would soften or crack vinyl. The RBT853 uses a fluoropolymer sleeve over a copper barrel, so it holds up in engine compartments, boiler and mechanical rooms, and industrial process panels better than a standard vinyl-insulated ring. For ordinary dry interior control panel work, a vinyl or nylon insulated ring terminal of the same stud size does the same electrical job.

Copper. That means it is intended for copper conductors, not aluminum - terminating aluminum wire requires an AL-rated or AL/CU dual-rated connector with the appropriate inhibitor compound. The copper barrel is crimped, not soldered.

Order Sta-Kon RBT853. That is the manufacturer part number for the fluoropolymer insulated, blue, 1/4 inch stud ring terminal, rated 600 V.

The RBT853 is blue. On insulated terminals the sleeve color is the field shorthand for the wire range, so crews can sort a handful of terminals on a panel floor without reading the stamp. Blue bodies are the mid-range size in that convention, sitting between the smaller red and the larger yellow. Confirm the gauge stamped on the part against the conductor you are crimping rather than relying on color alone.

Yes, country of origin is the United States. That matters on federal, state, and institutional jobs carrying domestic-sourcing requirements, where a foreign-made connector can hold up a submittal.

Insulated barrel terminals like the RBT853 are crimped with an insulated-barrel crimp die, not the open-barrel nest used on non-insulated lugs, and not pliers. Sta-Kon terminals are designed around Sta-Kon hand and powered tools sized to the terminal's color-coded range, so match the die to the terminal size and verify the crimp with a pull test on the first termination of a run.