Sta-Kon RH9731U NYLON TERMINAL

It's a nylon insulated ring terminal with a 90 degree bend in the tongue, so the ring sits perpendicular to the wire barrel instead of in line with it. That geometry is what you use when the stud or screw you're landing on faces away from the direction the conductor runs, and it keeps you from putting a sharp bend in the wire itself at the termination.

Nylon. The insulating sleeve on the RH9731U is nylon, not vinyl, which is the tougher of the two common insulations for abrasion and cut-through where terminals get pulled through a panel or bundled tight.

The RH9731U is white. On nylon insulated terminals, color is the wire range code, and white falls outside the familiar red/blue/yellow trio used for 22-16, 16-14 and 12-10 AWG. Match the part number rather than the color if you're working from a color habit, because a white sleeve will not be the 22-16 red you may be reaching for.

It's a crimp terminal. The barrel is compressed onto the stripped conductor with a crimper, no solder and no heat. Use a ratcheting crimper with a nest matched to insulated terminals; pliers or a generic cutter crimp station will deform the nylon sleeve and give you a joint that pulls out. Nylon insulation is not heat shrink, so there is nothing to shrink down after crimping.

Pick the 90 degree version, like the RH9731U, when the stud or terminal block screw is on a surface facing a different direction than the wire run, or when depth behind the panel is tight and a straight tongue would force the conductor into a hard bend. A straight (flag-free, in-line) ring terminal is the better choice when the wire approaches the stud head-on and you want the shortest, flattest stack under the nut.

Yes, and that's the main reason to choose the RH9731U style. A ring terminal is a closed barrel, so the screw or stud nut has to be fully removed before the connection can come off. A spade or fork terminal slides out sideways if the fastener backs off, which is why ring terminals are the usual call on motor loads, rooftop units and anything that vibrates.

Mexico. That matters if you're bidding public work with domestic-content or country-of-origin reporting requirements, since the RH9731U would be declared as MX.