Sta-Kon RB873-SC INS NYL RING TERM,18-14,No10,BLUE

The RB873-SC takes 18 to 14 AWG stranded or solid copper wire. The blue insulation is the standard color code for that range, so on a panel where you also run 22-16 (red) and 12-10 (yellow) terminals, the blue barrel tells an inspector at a glance which gauge is crimped in it. Anything smaller than 18 AWG will pull out of the barrel; anything larger than 14 will not seat.

A ring terminal like the RB873-SC is the closed-tongue type: the screw has to come all the way out to install or remove it, but once it is torqued down the wire cannot vibrate off the stud. That is why it is the choice for motor leads, grounding studs, rooftop equipment and anything on a vibrating machine. A spade or fork terminal slides in from the side under a loosened screw, which is faster for service work on a dense terminal strip, but it can back out. If the connection is a safety ground or lives on something that shakes, use the ring.

Nylon. The RB873-SC uses a nylon insulating sleeve rather than PVC/vinyl. Nylon handles a higher continuous temperature and resists abrasion, oils and solvents better, which is why it is specified for engine compartments, machine rooms and conduit pulls where a vinyl sleeve would get cut or soften. Nylon also funnels the strands into the barrel during insertion, which cuts down on stray-strand faults.

Use a proper insulated-terminal crimper sized for the 18-14 AWG (blue) range, not pliers or a hardware-store multitool. Sta-Kon insulated terminals are designed around a controlled-cycle crimp that compresses the barrel and the nylon sleeve together; squeezing with pliers deforms the sleeve, leaves the barrel under-compressed and gives a joint that reads fine on a meter and fails under load. Match the crimp die to the blue color band.

Yes, as long as the ground conductor is 18 to 14 AWG copper and the screw is a #10. The closed ring is the right geometry for a bonding or grounding point because it cannot slip off a partially loosened screw. For a 12 AWG or larger ground, step up to the next wire-size class of ring terminal instead of forcing the conductor into this barrel.

Order it as Sta-Kon RB873-SC. That is the manufacturer part number for the nylon insulated ring terminal, 18-14 AWG, No. 10 stud, blue. It is made in the United States. If you are cross-referencing a bill of material, the RB prefix is the nylon insulated ring series and the -SC suffix is the packaging/strip designation, so the whole string matters when you quote it.