The T Nut – Chuck Soft Jaws is designed specifically for lathe chuck applications — it sits in the T-slot of the chuck body and anchors the jaw-mounting screw. Every time you change jaws (hard jaws to soft jaws, or swap jaw sets for a different bore range), this nut takes the load.

The bearing face is precision-ground for flush seating inside the chuck slot. A nut that doesn’t sit flat causes jaw runout — the workpiece won’t spin true, and your parts come out eccentric. Ground faces eliminate that.