Chosen Solution
My Late 2015 iMac has a 500GB Sata SSD. I want to add a 1TB PCIe SSD blade and replace the Sata SSD with a large capacity HDD. What is the size of the PCIe SSD mounting/retaining scew? It seem most Windows Laptop and Desktop systems use a 3mm screw for M.2 SSDs, but I know Apple likes to be different just to make things difficult. Since my system does not have a factory SSD blade, I assume there is no mounting screw inside and I want to make sure I have all the correct parts before going through the effort to open it up.
You will need to get the screw as its not supplied in the system. Here’s the needed part iMac 21.5"/27" Screw - SSD Mounting Screw, Apple P/N 923-0336
