Sta-Kon RC703M INS NYL RNG TRM 12-10 BLT 5/16 TAPE

The RC703M is sized for 12-10 AWG stranded or solid copper wire. The yellow nylon insulation is the standard color code for that 12-10 range, so an electrician can identify the barrel size on sight in a panel or junction box.

It is a nylon insulated ring terminal. Nylon sleeves are tougher than vinyl, resisting abrasion and cracking when the terminal is pulled through a conduit body or flexed in a control cabinet, and they handle higher temperatures. The insulation covers the barrel only, so the ring tongue itself is bare metal for the bolted connection.

Use the ring. A ring terminal like the RC703M is a closed tongue, so the conductor cannot come off the stud unless the nut is fully removed, which is why ring terminals are required on grounding and most motor and panel connections. Spade or fork terminals slide out from under a loosened screw, which makes them faster for service work on low-vibration terminal blocks but unsuitable where vibration or code requires a captive connection.

The terminals are supplied tape mounted, meaning they come collated on a carrier strip rather than loose in a bag. That is the format used for machine or bench-mounted crimping tools that feed terminals automatically, which matters if you are terminating in volume on a panel shop bench. Loose-piece terminals are what you want for hand crimping in the field.

Use an insulated-terminal crimp tool with the yellow 12-10 AWG die nest. Nylon insulated terminals crimp in the same insulated-barrel dies as vinyl ones, color keyed by wire range, so the yellow nest matches the RC703M. An uninsulated-terminal crimper or pliers will split the nylon sleeve and give you an unreliable connection.

Yes, country of origin is the United States. That answers the domestic sourcing requirement that comes up on government, military and federally funded institutional jobs where a Buy American preference applies.