Sta-Kon B486 NON-INS RECT RING TRM 16-14 No4

It is a No. 4 ring, so it lands on a #4 screw or stud. On a terminal block or ground lug with a #6 or #8 screw the tongue will not pass over the threads, so match the ring size to the hardware in the box before ordering.

Yes. The B486 carries a 600 V rating, which covers 120/208, 277/480, and standard control wiring.

It is a non-insulated terminal, bare copper with no nylon or vinyl sleeve. In a tight box or panel where rings sit close together you either sleeve the crimp with heat shrink yourself or switch to an insulated ring. Bare terminals are the usual choice where heat, solvent exposure, or an insulation displacement clamp makes a plastic sleeve a liability.

It carries UL file E9809. That is the reference an inspector or a spec reviewer will want when the terminations are on an inspected job.

The tongue on the B486 is rectangular rather than circular, which gives a flatter, narrower footprint on a stud so terminals can sit side by side on a crowded block without the tongues overlapping. Electrically it does the same job as a round ring: a closed ring that cannot vibrate off a stud, unlike a spade or fork terminal which can back out if the screw loosens.

Country of origin is the United States. That matters on federal, municipal, and other domestic-preference procurement where the source of the material has to be documented.

The barrel is copper, so it takes solder, but these are crimp terminals and the copper is meant to be cold-formed onto the conductor with a matched die. Crimping is what the UL listing covers. Solder wicking into the strands behind the barrel also creates a stiff point that fatigues under vibration, which is exactly what a ring terminal on a motor or panel lead is there to avoid.