The nuts feature a self-locking design, so when they are fastened to a stud by hand, they will stop when they reach the "locking" portion. You will then need a wrench or socket to fasten it further, at which point it will "lock" in place.
M10x1.5 Threaded Turbocharger Stud Kit Flange Serrated Nut (Set 2)
M10x1.5 Threaded Turbocharger Stud Kit Flange Nut (set 2)
For Boost Pressure Fitting Kit for Turbocharger Compressor Outlet with 0.25 Inch ID Silicone Hose Interface and M10x1.25 Threaded Connection
ZONFANT Turbo Oil Feed Pipe Tube, Turbocharger Oil Return Line Compatible with Buick Chevy Vehicle Encore 13-18, Cruze 11-18, Sonic 12-18, Trax 15-18, Replace #55592600 25198546 25200947
ORIGINAL TRIUMPH PRE-UNIT ROCKER BOX TO CYL HEAD STUD 1/4"x 15/16" 70-1540 X 4
Rieju MRT 50 SM Freejump 15-17 Cylinder Head Stud & Nut Set M7 x 115mm