Sta-Kon 18RA-4X EXP VYNL INS RNG TERM 22-18 No4 RED

The 18RA-4X is sized for 22 to 18 AWG stranded wire. The red insulation is the standard color code for that range, so on a panel where crimps are color-checked, red tells the next person the conductor is 22-18 AWG. For 16-14 AWG you need the blue-coded size, and for 12-10 AWG the yellow.

A ring terminal like the 18RA-4X is captive: the screw passes through a closed barrel, so the wire cannot pull off sideways if the screw backs off slightly. That is why ring terminals get specified for ground screws, motor leads, and anything subject to vibration. A fork or spade slides out from under a loosened screw, but it lets you drop a wire without fully removing the screw, which is why panel builders use it where frequent service access matters more than retention.

Vinyl insulation. Vinyl handles general-purpose indoor control and low-voltage work and is the most common insulated terminal body. If your spec calls for nylon, that is a different material with higher temperature and abrasion tolerance, so a vinyl barrel is not a drop-in substitute where nylon is explicitly specified.

Order it as Sta-Kon 18RA-4X. It is made in the United States, which matters on government and institutional jobs carrying domestic-sourcing requirements.

Yes, use a crimper with a die matched to the 22-18 AWG insulated range, which on most tools is the red-marked nest. Crimping a 22-18 barrel in a 16-14 or 12-10 die under-compresses the barrel and gives you a joint that passes a visual check and fails a pull test. The tool is not included with the terminal.

No. The barrel is sized for a single conductor in the 22 to 18 AWG range. Doubling two 22 AWG wires into one barrel gives an uneven crimp and is not how the terminal is rated. If you have to land two conductors on one No. 4 stud, crimp each in its own ring and stack them, or combine the wires upstream with a splice.