Review on 🛠️ LU-CC 180Pcs M2 Black Nylon Spacers Hex Nut Stand-off Assortment Kit - Ideal for FPV Drones, Quadcopters, PC Building, PCB Motherboard Standoffs by Joe Griggs

Tolerances are too tight to mate with existing M2 screws. Also note that nylon doesn't have the tensile strength of a metal screw so they don't have the torque to tighten them to the same level, but they should work fine for holding a small circuit board or other small component in place. I would also like to know the thread pitch, but as I understand it you don't need to know this when connecting the nut from the same kit to the rack.