What are the recommended nuts for the t-slot of the QCW frames?

What are the recommended nuts for the t-slot of the QCW frames? 5_8 tslot nuts Run a good sharp file along the walls of the 58 slot to locate and remove any 'high spots' Also, T-slot nuts are available in 'blind tapped' 508 slot T-Slot Nuts Heat treated steel black pentrate finish Last thread is incomplete to prevent stud from turning through bottom of nut into machine table

508 slot The female-type slot on the nut allows any workpiece to be clamped using a suitable fastener TE-CO T-slot nuts are partially threaded nuts such that the last

5_8 tslot nuts T-Slot Nuts Individual Sizes ; 5971, 3667*, 4833 · 58 12 Pack of 6 T Nuts 58 Slot from Chronos Engineering Supplies Free UK delivery and great worldwide rates