Sta-Kon F2036 INS PP FERRULE 14, 2.5 MM2, LG .74

The F2036 is sized for 14 AWG conductor, which is the 2.5 mm2 metric equivalent called out in its description. If you are terminating 16 or 12 AWG strands, you need a different ferrule size, since a ferrule only crimps reliably on the gauge it is barrelled for.

Blue is the color-coding on this insulated ferrule, and on a panel build that color is how an inspector or the next electrician identifies the conductor size at a glance. Here blue corresponds to the 14 AWG / 2.5 mm2 size. Keep the color convention consistent across a cabinet so crews can size-check terminations without pulling a wire out of a terminal block.

The crimp barrel is copper and the insulating sleeve is polypropylene. Copper barrel matters because it keeps resistance low on a current-carrying termination and crimps down without cracking; the polypropylene collar is what keeps the strands gathered and provides strain relief where the wire enters a terminal block.

Use a ferrule like the F2036 when the stranded conductor goes into a clamping screw or cage-clamp terminal: the copper sleeve gathers the strands so the screw does not splay or shear them, and the insulated collar gives strain relief at the entry. Fork and ring terminals are for landing under a screw head or stud, not into a bored terminal. For 14 AWG / 2.5 mm2 control wiring in a panel, the ferrule is the right termination.

The F2036 has a .74 inch overall length. Strip enough bare conductor that the strands fill the metal barrel to its full depth without bottoming into the plastic collar, then crimp with a four-indent or hex ferrule crimper sized for 2.5 mm2. Too short a strip leaves an unsupported crimp; too long leaves bare copper past the barrel.

Order Sta-Kon part F2036. It is manufactured in Germany. That is the number to put on a purchase order or submittal for the 14 AWG blue insulated ferrule.