Sta-Kon RC1154 INS NYL FORK TERM 12-10 BH No10 YEL

The RC1154 is sized for 12-10 AWG stranded copper wire. That is the yellow insulation code on nylon-insulated terminals, so if the conductor you are terminating is 14 AWG or smaller you need a different size (blue for 16-14, red for 22-18) rather than over-crimping this barrel.

It is a No. 10 stud terminal, so it slides under a #10 screw or binding-head terminal screw. The forked (spade) tongue means you can slip it on without pulling the screw all the way out, which is why panel and control-wiring techs favor it over a ring tongue on crowded terminal blocks.

Yes, the RC1154 carries a 600 V rating and is built under UL file E9809, which covers the nylon-insulated Sta-Kon terminal line. That makes it usable in 480 V and 600 V industrial control panels as well as ordinary 120/277 V branch and fixture whips.

A fork terminal like the RC1154 is the faster choice on terminal strips and blocks where you only back the screw out a turn or two, since the open tongue slides in and out. A ring terminal is the better choice on vibrating equipment or any connection where the wire must stay captive if the screw loosens, because the closed tongue cannot slip off. Both are available for 12-10 AWG wire and a No. 10 stud.

No. The barrel is copper, so it is intended for copper conductors only. Aluminum wire needs a terminal specifically marked AL or AL9CU along with the correct inhibitor compound, otherwise you get galvanic corrosion at the crimp.

Country of origin on the RC1154 is the United States, which is what government, education, and healthcare procurement teams usually need documented for domestic-sourcing requirements. The part number to specify is RC1154.

The RC1154 uses a nylon insulating sleeve rather than vinyl. Nylon takes a higher operating temperature and resists abrasion and crushing during pull-through better, so it holds up in panel ducts and conduit bodies where vinyl can split. Color coding is the same either way, and yellow still means 12-10 AWG.

Use a crimper matched to insulated terminals in the 12-10 AWG range, which is the yellow die position on a color-coded insulated-terminal tool. Sta-Kon terminals are designed around the manufacturer's own hand and bench tooling; a generic auto-parts crimper or pliers will not produce a repeatable crimp on a 600 V rated connection.