Sta-Kon F4020 INS PP OLD DIN FERRULE 14AWG 2.5MM2

The F4020 wire ferrule is sized for 14 AWG conductor, which is the 2.5 mm2 metric equivalent called out in the part description. Strip and crimp a single 14 AWG stranded conductor into the copper barrel; it is not intended for doubling two conductors of that size.

It refers to the older DIN dimensional convention for ferrule barrel and insulator sizing, as opposed to the later revised DIN sizes. It matters because barrel length and insulator diameter differ slightly between the two, so if you are matching existing terminations in a German-built control panel or feeding a terminal block prepped for old-DIN ferrules, this is the version that matches. The F4020 is made in Germany.

Yes, a ferrule crimper. Insulated ferrules such as the F4020 need a four-indent or trapezoidal ferrule crimp die that compresses the copper barrel through the polypropylene sleeve; a standard ring-terminal or insulated-lug crimper will not form the connection correctly. The tool is a separate purchase, not supplied with the ferrules.

Use the ferrule when the wire lands in a screw-clamp or spring-cage terminal block, which is most control panel and VFD work. The F4020 bundles the 14 AWG strands into one solid copper pin so the clamp cannot splay or shear them, and the insulating sleeve covers the strip point. A fork or ring terminal is the right choice only where the conductor goes under a captive screw head or a stud, not into a cage clamp.