Sta-Kon RF267 INS NYL RNG TERM 4 BOLT No10 YELLOW

The RF267 is built for 4 AWG copper conductor. It is a single-size barrel, so it will not grip 6 AWG or 2 AWG properly. If your conductor is a different gauge, move to the matching Sta-Kon ring terminal for that size rather than forcing this one, since a loose crimp on a 4 AWG feeder is a heat problem waiting to happen.

No. The RF267 is a copper terminal and should be used on copper conductor only. Terminating aluminum in a copper-only lug risks galvanic corrosion and a failing connection; for aluminum feeders use a lug listed AL9CU or aluminum-specific.

Yes, the RF267 nylon insulated ring terminal carries a 600 V rating, which covers standard commercial and industrial branch and feeder work up to 600 volts. It is UL recognized under file E9809.

Use the ring. A ring terminal like the RF267 is a closed tongue, so it cannot vibrate off the stud if the nut loosens, which is why ring terminals are standard on motor leads, bus bars, and anything subject to vibration. A fork or spade tongue is faster to drop on and off a screw terminal and is the choice where you need to service the connection often and the location is not subject to vibration.

It needs a crimper matched to the 4 AWG barrel, not a general-purpose insulated-terminal plier sized for 22 to 10 AWG. Heavy nylon insulated barrels in this range are crimped with a large-capacity ratchet or hydraulic crimper using the die that corresponds to the yellow color code. A pair of pliers or an undersized die will not produce a connection that holds the published 600 V rating.

Yellow is the color code on the nylon insulation that identifies the wire range, and on Sta-Kon terminals yellow marks the heavier gauges. For the RF267 that means 4 AWG. On a panel with mixed terminations, the color is how an electrician verifies at a glance that the right barrel went on the right conductor.

Nylon is the tougher of the two. It resists abrasion and cut-through better than vinyl and holds up to higher temperatures, which is why nylon insulated terminals are specified for equipment rooms, motor connections, and anywhere the lead gets pulled through a tight raceway. The RF267 uses a nylon sleeve over a copper barrel.

Order it as Sta-Kon RF267. It is manufactured in Mexico. Distributors cross-referencing should note the RF prefix designates the nylon insulated ring series; the 267 identifies the 4 AWG, No. 10 stud configuration.