Sta-Kon RA6F POLYCBNT FRK TRM 0.5-1.5MM2 STUD M6

The RA6F is sized for 0.5 to 1.5 mm2 conductor, which is roughly 22 to 16 AWG. Red insulation is the standard color code for that range, so if the wire you are terminating is 14 AWG or larger, this is the wrong terminal.

Yes. The RA6F fork tongue is made for an M6 stud or screw, so it slides in around an M6 terminal screw that is backed out rather than fully removed. On smaller screws the fork opening will be wider than the screw head needs, and on anything larger than M6 it will not go on at all.

A fork (spade) terminal like the RA6F lets you land the wire without pulling the screw all the way out, which is why it is the common choice on terminal blocks and device screws you may need to service repeatedly. A ring terminal is captive and cannot vibrate off a loosened screw, so it is the better pick on motors, battery posts, and anything subject to vibration or where code or spec calls for a captive connection.

The barrel is electrolytic copper, which is what gives it low resistance on a properly crimped copper conductor. Copper-only terminals are for copper wire; do not use it on aluminum conductor, which needs a terminal rated and listed for aluminum or CU/AL.

A crimp tool matched to insulated terminals in the 22 to 16 AWG range. The RA6F is a crimp-on fork terminal with no solder and no set screw, so the mechanical and electrical connection is entirely in the crimp. Using pliers or a general-purpose tool on a polycarbonate sleeve tends to split it and leaves an unreliable barrel.

Neither. It is a polycarbonate insulated fork terminal, so the sleeve is rigid plastic rather than soft PVC. Polycarbonate holds its shape during crimping and resists cracking better than vinyl, which matters when you are pulling terminals into a dense wire duct.

Yes, and that is how most electricians use them. Red insulation on a fork terminal signals the 0.5 to 1.5 mm2 (22 to 16 AWG) range, so a tech opening the enclosure later can read the wire size off the terminal. If you are standardizing a panel build, pair these with the blue (1.5 to 2.5 mm2) and yellow (4 to 6 mm2) sizes for the heavier runs.

Order it as Sta-Kon RA6F. Country of origin is Sweden, which is worth noting if you are filing country-of-origin documentation on a government or institutional purchase order.