Sta-Kon RAS18-8X HEAT-SHR RING TERM, 22-18, No8, RED

The RAS18-8X takes 22 to 18 AWG stranded copper conductor. That is the red color code band, and the red insulation on the barrel is how you identify it in a bin of mixed terminals. If your conductor is 16 or 14 AWG, this barrel will not crimp down correctly and you need the blue 16-14 size instead.

It is a No. 8 ring, so it lands on a #8 screw or stud. Ring terminals do not have the slot a fork terminal has, which means the stud has to come all the way out to install it, but it also means the connection cannot back off the post under vibration.

Both. The RAS18-8X is a heat shrinkable ring terminal: you crimp the barrel to the conductor first, then apply heat to shrink the insulation sleeve down over the crimp and onto the wire jacket. Skip the heat step and you lose the sealed, strain-relieved joint that is the whole reason to specify this over a standard vinyl-insulated ring.

Copper. That makes it a match for copper conductors only, which is what 22-18 AWG control and signal wire will be. Do not land it on aluminum conductor.

Use the heat shrink version wherever moisture, washdown, road salt, vibration, or outdoor exposure hits the termination. The shrink sleeve seals against the wire jacket and adds strain relief at the crimp neck, which a plain vinyl barrel does not do. For dry indoor panel work where nothing flexes, a standard insulated ring is usually enough. The RAS18-8X is the sealed option in 22-18 AWG on a No. 8 stud.

Order it as Sta-Kon RAS18-8X. It is made in the United States. Distributors cross-referencing this one should note the naming: RAS is the heat shrink ring family, 18 is the 22-18 AWG range, and 8 is the No. 8 stud.