It is crucial to note: It is protected under copyright by the PCI-SIG and the M.2 standards working group.
No discussion of the Rev 5.0 M.2 spec is complete without addressing heat. The document dedicates an entire chapter (Chapter 7: "Thermal and Mechanical") to this issue. pci express m.2 specification revision 5.0 version 1.0 pdf
Official access to the full 500+ page technical specification is typically restricted to PCI-SIG members . It is crucial to note: It is protected
Stfw.Ru