Sta-Kon RCT363 INS FLUOR RING TERM, 22-18, 1/4, CL

The RCT363 insulated ring terminal carries a 600 V rating, which covers standard control, panel, and building branch-circuit wiring work. It is also UL recognized under file E9809, so it can be used where the inspector wants a listed termination.

Yes. The RCT363 is built as a 1/4 ring terminal, so it slips over a 1/4 inch stud, bolt, or terminal-block screw. If your lug landing uses a #10 or 5/16 stud, you need a different ring size, not this one.

Fluoropolymer insulation handles higher temperatures and resists oils, solvents, and fuels better than vinyl, which is why the RCT363 shows up in engine compartments, process equipment, and hot panel enclosures. For dry, room-temperature control panels a standard nylon-insulated ring works fine; spec the fluoropolymer version when heat or chemical exposure is the concern.

The barrel is copper, so it mates with copper conductors without the dissimilar-metal concerns you get terminating copper into aluminum lugs. It is a crimp-style terminal, so it needs a proper ratcheting or die-type crimp tool for insulated terminals, not pliers.

A ring terminal is the safer choice where vibration or accidental pull-off is a concern, because the closed 1/4 inch ring cannot slip off the stud once the nut is torqued. A fork terminal installs faster on a block with captive screws since you do not have to remove the screw, but it can back out. On motor terminals, grounding studs, and anything that vibrates, use the ring.

Yellow is the color-coded insulation on the RCT363. Terminal makers code the insulation by wire-size band, so on a job where crews are standardizing terminations, the color is the quick visual check that the right terminal went on the right gauge conductor. Match the color to the band your spec calls out rather than mixing bands in one panel.

Country of origin on the RCT363 is the United States, which matters on government, institutional, and federally funded work where domestic preference language applies.