Sta-Kon RC733 INS NYL RING TRM 12-10 BOLT 3/8 YEL

The RC733 is sized for 12-10 AWG conductor. The yellow nylon insulation is the standard color code for that range, so on a panel where blue barrels are 16-14 and red are 22-16, the yellow ones are your 12-10 crimps. Running it on anything smaller than 10 or larger than 12 AWG will give you a loose or unseated crimp.

Yes. The RC733 ring tongue is made for a 3/8 inch bolt or stud, which is the common size on larger breaker lugs, bus bars, ground bars and battery studs. If your stud is 1/4 or 5/16, this ring will sit loose under the nut and you want the matching smaller ring size in the same 12-10 yellow range.

The RC733 is UL under file E9809. For an inspector or a submittal package, that plus the 600 V rating and the 12-10 AWG conductor range is what you cite for the termination.

The conductor barrel is copper, so the RC733 is a copper-only terminal. Use it on copper conductors, 12-10 AWG. Aluminum building wire needs a terminal specifically marked AL or AL/CU, not this one.

Nylon barrels like the one on the RC733 are tougher than vinyl: they resist abrasion and cracking when the terminal is pulled through a wireway or flexed at a terminal block, and they hold up to higher heat. Vinyl insulated terminals are cheaper and fine for low-stress, cooler locations. For control panels, motor connections and anywhere the lead gets handled, the nylon version is the one to spec.

A ring terminal, like the RC733, is captive: the bolt passes through a closed tongue so the conductor cannot back out if the nut loosens. A fork or spade slides off sideways and is only appropriate where the screw stays captive and the connection sees no vibration. For grounding, battery studs, bus bars and anything that vibrates, use the closed ring.

600 V. That covers standard commercial and industrial branch circuits, 120/208, 277/480 and control wiring, so it is usable in panelboards, motor control centers and equipment enclosures operating at or below 600 volts.

Use an insulated-terminal crimp tool with the color-coded die for the yellow 12-10 range. The die compresses the barrel through the nylon sleeve without splitting it. A bare-terminal or non-insulated die will cut the insulation and give you an uncontrolled crimp, and pliers are not an acceptable substitute on a 600 V termination.

Country of origin on the RC733 is the United States. For federally funded or Buy American specified work, that is the value to put on your submittal, along with the UL file E9809.

Sta-Kon ring terminals break down by conductor range and stud size. The RC733 is the 12-10 AWG, 3/8 inch bolt, yellow nylon version. Keep the yellow 12-10 terminals stocked in each stud size your equipment uses, and keep the smaller-gauge color codes separate so a tech is not guessing at the crimp die. All of them are copper barrel, 600 V.