Sta-Kon F9032 NON-INS FERRULE 4, 25 MM2, LG .984

The F9032 is sized for 4 AWG conductor, which is the 25 mm2 metric equivalent called out in the part description. Use it on stranded copper of that size only, an oversized or undersized barrel will not crimp to a reliable gas-tight joint.

No. It is a non-insulated copper ferrule, a bare barrel with no plastic collar. If your panel spec or local practice calls for a colour-coded insulated collar for strain relief and identification, you want an insulated ferrule instead of this one.

Barrel length is .984 inch (25 mm). That length matters when you are checking terminal block depth, a long barrel that bottoms out before the clamp closes gives you a bad termination.

A ferrule gathers the strands into one solid pin so the terminal screw or clamp bears on the barrel instead of crushing and splaying individual strands. On 4 AWG that matters, a large stranded conductor is the one most likely to lose strands under a clamp and loosen over thermal cycles. The F9032 is the copper, non-insulated version for that size.

Yes. A 25 mm2 / 4 AWG barrel is beyond the range of the small four-indent ferrule pliers used for control wiring. You need a crimper rated to cover 25 mm2 ferrules, typically a hexagonal or large square-die tool. The crimper is not supplied with the ferrule.

Copper barrel, manufactured in Germany. Copper keeps the connection conductive and compatible with copper conductors, do not pair it with aluminium wire.