Sta-Kon F4007 INS PP OLD DIN FERRULE No24 0.25MM2

The F4007 ferrule is sized for 24 AWG conductor, which is the 0.25 mm2 metric equivalent called out in the part description. One ferrule, one stranded conductor. If your conductor is heavier than 24 AWG the barrel will not accept it, and a larger ferrule in the series is what you want.

The collar is polypropylene, and the barrel that crimps onto the conductor is copper. Polypropylene collars are the common choice for control panel and machine wiring where you want an insulated funnel entry to guide strands into the barrel. For a high-temperature application you would normally specify a different insulation material.

A ferrule like the F4007 gathers the strands of a 24 AWG conductor into a solid crimped copper barrel, so nothing frays out of the clamp, the screw bears evenly, and the termination doesn't loosen as the strands relax. Bare fine-stranded wire under a screw clamp is the usual cause of a warm terminal on a control panel. The insulated collar also covers the strip point so no copper shows outside the block.

Yes, ferrules need a ferrule crimper, not a standard insulated-terminal tool. Square or trapezoidal ferrule dies compress the copper barrel uniformly around the conductor; a nest-and-indenter terminal crimper will distort it. At 0.25 mm2 you are at the small end of the range, so make sure the tool's die set goes down that far.

It is a single-conductor ferrule for one 24 AWG / 0.25 mm2 wire. If you need to land two conductors in one terminal point, a twin ferrule is the correct part; forcing a second wire into this barrel gives you an unreliable crimp.

Order Sta-Kon F4007. That is the manufacturer part number for the yellow, polypropylene insulated, old DIN 0.25 mm2 / 24 AWG ferrule, made in Germany.