Sta-Kon RC367U INSVIN RNG TRM 90D 12-10 No10 YEL

The RC367U is sized for 12-10 AWG conductor. That's the yellow color code on insulated terminals, so if you're pulling from a bin by color, yellow is the 12-10 range. Running 16-14 or 22-18 wire into it will leave the barrel loose and the crimp won't hold.

The RC367U is a right angle ring terminal: the ring sits perpendicular to the wire barrel instead of flat in line with it. That lets the conductor run parallel to a panel or bus face while the ring lands flat on the stud, so you're not putting a sharp bend in the wire itself. Useful in tight enclosures, terminal blocks mounted on a back panel, and motor or equipment terminations where a straight ring would force the wire out into the wireway. If your wire approaches the stud head-on, use a standard flag or straight ring instead.

Yes, the barrel is vinyl insulated, colored yellow to the standard 12-10 AWG code. Vinyl is the general purpose insulation for these, fine for typical panel and equipment work, but it is not nylon and not heat shrink, so it has less abrasion resistance and no moisture seal at the wire entry. For wet or vibration heavy locations, look for a nylon insulated or adhesive lined heat shrink ring instead.

Crimp the RC367U with a die or nest sized for insulated 12-10 AWG terminals, which is the yellow station on most insulated terminal crimpers. Sta-Kon terminals are designed around a controlled indent crimp, so a generic pliers style squeeze will not give a consistent barrel. Match the die to the yellow 12-10 range, not to the ring size.

Use the ring when the connection is on a stud with a nut and you want a termination that cannot come off if the nut backs off, which is the usual call for motor leads, ground studs, and anything that sees vibration. A fork or spade slips in under a loosened screw without removing it, which is faster for service on terminal blocks but will walk off under vibration. The RC367U is the ring version in 12-10 AWG on a No. 10 stud, with the ring turned 90 degrees to the wire.

Country of origin on the RC367U ring terminal is the United States, which matters if you are filling a job with domestic sourcing requirements on the electrical package.

The barrel is sized by conductor gauge, 12-10 AWG, not by strand count, so it takes either as long as the conductor falls in that range. Stranded is the more common use for a crimped ring; with solid wire make sure the strip length fills the barrel and the crimp seats against the copper rather than sliding.