Sta-Kon RCS10-6FLX HEAT-SHR LKG FORK TERM, 12-10, No6,

The RCS10-6FLX is sized for 12-10 AWG stranded copper conductors. The yellow insulation is the standard color code for that gauge range, so you can sort these by sight in a bin or on a panel build. Anything smaller than 12 AWG will not crimp reliably in this barrel, step down to a 16-14 AWG terminal for that.

It is a No. 6 fork, so it slips over a #6 screw or stud. The open fork means you can land or remove the wire without pulling the screw all the way out, which is why panel and control work favors them over ring tongues. If the terminal block uses a #8 or #10 screw, you need the matching stud size instead, the #6 fork tongue will not seat properly under a larger head.

The RCS10-6FLX is a heat shrinkable terminal, so after crimping you hit the sleeve with a heat gun and it collapses onto the wire insulation. That gives you a sealed, moisture resistant transition at the conductor instead of the open barrel you get with a standard nylon or vinyl terminal. It also adds strain relief at the crimp. For dry indoor panels a plain insulated fork is fine, for outdoor, washdown, rooftop, or marine environments the heat shrink version is the one to use.

Yes, the RCS10-6FLX carries a 600 V rating, which covers typical motor control, panel, and lighting circuit work at 120/208/240/480 V.

The locking feature on the RCS10-6FLX adds upturned tips at the end of the fork tongue so the terminal resists backing out from under the screw head if the connection loosens from vibration. On equipment that vibrates, pumps, motors, HVAC units, rooftop gear, that detail is the difference between a connection that stays put and a nuisance callback. A standard flat spade has no such retention.

Order it as Sta-Kon RCS10-6FLX. That designation breaks down as a heat shrink locking fork terminal for 12-10 AWG with a No. 6 stud tongue.

Country of origin is the United States, which matters if you are filling a government, institutional, or Buy American spec on a panel or MRO order.

Use a proper insulated-terminal crimper matched to the yellow 12-10 AWG color code die. Pliers deform the barrel unevenly and the heat shrink sleeve will not seat correctly over a bad crimp. After crimping, apply heat to shrink the sleeve down onto the conductor insulation.