Sta-Kon RZ4F POLYCARBONATE INS FORK TERM GRN M4

The RZ4F is sized for 0.25 to 0.75 mm2 conductor, which is the metric equivalent of roughly 22 to 18 AWG. If your conductor is heavier than 0.75 mm2 it will not seat in the barrel, and crimping it anyway gives you a joint that pulls out under vibration.

Yes. The RZ4F is an M4 fork (spade) terminal, so it slides onto an M4 stud or terminal screw without removing the screw completely. That is the practical reason to pick a fork over a ring terminal when you are landing control wiring in a crowded panel or on a terminal block.

A fork terminal like the RZ4F goes on and off without backing the screw all the way out, which saves time on terminal blocks and on service calls where you are swapping conductors. A ring terminal is captive and will not slip off a loosened screw, so it is the better choice on vibration-prone equipment or anywhere a code or spec calls for a closed-barrel connection.

The conductor barrel is electrolytic copper, which is what gives the crimp its conductivity and its ability to cold-form around stranded wire. The sleeve is polycarbonate rather than vinyl, so it is a harder, more heat-tolerant insulation than a standard PVC-sleeved terminal, and it resists cracking when the crimp tool bites down.

Order Sta-Kon RZ4F. That single part number covers the green polycarbonate insulated M4 fork terminal for 0.25 to 0.75 mm2 wire; there are no size or finish options to specify. Manufacture is in Sweden.

Green is the color code for this wire range on insulated terminals, matching the 0.25 to 0.75 mm2 barrel. It is an identification aid, not an earth/ground designation, so do not read the color as meaning the terminal is only for grounding conductors. If you standardize a panel build by color, the green barrels are your smallest gauge group.

Yes, it crimps like any insulated barrel terminal in the small (red/0.25-0.75 mm2) nest of an insulated-terminal crimper. Because the sleeve is polycarbonate rather than soft vinyl, it tolerates the jaw pressure without splitting, but you still want the correct die so the copper barrel is compressed and not just pinched.