Good luck finding Nyloc nuts in M14 x 1.0. That's a non-standard metric thread.
M14 normally comes in pitches of 2mm (standard) or 1.5mm (fine)
You can get M14 x 1.0 in plain hex or slotted (castellated) hex, but I doubt you'll find 'em with nylon inserts.
As far as I'm aware, Nyloc nuts usually only come in standard coarse thread. I'm happy to be proven wrong though.