Sta-Kon F4006 INS PP OLD DIN FERRULE 24AWG .25MM2

The F4006 is sized for 24 AWG wire, which is 0.25 mm2 in metric terms. It is a single-size wire-end ferrule, so stranded conductors outside that size will either not enter the barrel or will not crimp to a solid termination.

Yes, use a dedicated ferrule crimper, not a general insulated-terminal tool. Ferrules of this size are crimped square or trapezoidal with a four-indent or hex die that compresses the copper barrel through the polypropylene collar. A standard spade-terminal plier will crush the sleeve and leave the strands loose. Make sure your tool's die range covers 0.25 mm2 (24 AWG), since many ferrule crimpers start at 0.5 mm2.

Yes. The F4006 insulation sleeve is yellow, and on the old DIN ferrule color scheme that yellow collar marks the 0.25 mm2 (24 AWG) size. Electricians building control panels use the sleeve color to read conductor size at a glance without re-measuring, so keep the colors consistent if your panel was built to the old DIN scheme.

A ferrule gathers the strands into one solid copper barrel so the terminal screw clamps a single body instead of loose strands. That prevents stray strands shorting to the next terminal, stops the strands from splaying or cold-flowing under the screw, and keeps the connection tight over time. On 24 AWG control wiring like the F4006 covers, strands are fine enough that bare insertion is a common cause of loose terminals.

No. The F4006 is a single-conductor ferrule sized to 0.25 mm2 (24 AWG), so its barrel volume is matched to one conductor of that size. For doubling two conductors into one terminal you need a twin-entry ferrule, which has a wider barrel and a two-port collar.

The barrel is copper, which is what you want in series with the conductor. Copper keeps the resistance of the termination low and matches the copper conductor it is crimped onto, so there is no dissimilar-metal junction inside the terminal.

The collar is polypropylene. It serves as the funnel that guides the fine strands into the barrel during assembly and as the insulating sleeve over the crimp afterward. Polypropylene is the standard ferrule sleeve material and takes the crimp jaw pressure without cracking off.

Germany. That matters mainly because the F4006 is built to the DIN ferrule dimensions and color scheme used across European control gear, so it drops into panels and terminal blocks specified to those conventions.