Sta-Kon 14RB-10FLX EXP INS VINYL LKG FORK TERM, 18-14

The 14RB-10FLX locking fork terminal takes 18 to 14 AWG stranded copper conductor. The blue insulation is the standard color code for that 18-14 AWG range, so on a panel you can tell at a glance which barrel size is which without pulling the terminal off the wire.

Yes. The terminal carries UL file E9809, which is the reference an inspector or a spec writer on a government, healthcare, or school job will ask for. It is also made in the United States, which matters where domestic-sourcing language appears in the contract.

The 14RB-10FLX is a #10 stud size fork, so it goes under #10 screws and studs. On a terminal block or device screw that is a #8, the fork slot is wider than the screw head needs and the connection can pull through, so match the stud size rather than forcing it.

A locking fork terminal like the 14RB-10FLX slides under a screw head that is already in place, which is what you want on a crowded terminal strip or a device screw you cannot fully remove. The upturned tangs on the fork resist backing out under vibration, so it holds better than a plain spade. A ring terminal is still the choice where code or spec calls for a captive connection on a stud, since the screw must come all the way out to release it.

600 V. That covers standard 120/208, 240, and 480 V control and branch circuit work, which is why these show up in motor control centers, lighting panels, and HVAC control wiring. It also carries UL file E9809.

Mechanically a common insulated-barrel crimper in the blue 18-14 AWG die will close it, but Sta-Kon terminals are designed around Sta-Kon tooling and that is what a UL-recognized termination assumes. On inspected commercial work, use the matching Sta-Kon hand tool with the 18-14 die so the crimp matches the UL E9809 listing conditions.

No. The 14RB-10FLX barrel is copper and is intended for copper conductor only. Putting aluminum wire in a copper-only barrel risks a high-resistance joint from galvanic corrosion, so for aluminum you need a connector specifically marked AL or AL9CU.

The insulation is vinyl, which is standard for indoor panel and control work at 600 V. Vinyl is not a high-temperature sleeve, so for a hot rooftop RTU or anything near an engine or heater element, use a nylon-insulated or heat-shrink terminal instead and keep the vinyl ones inside conditioned or weather-protected enclosures.