Models
Hex Nut 3D Printable Models. Makeshape.co have 2 Hex Nut 3D Printable Models.
Cable gland PG (pg 13.5, pg 16) only nut
Thingiverse
AndewK
Free
5mm to 7mm hex adapter for 1/18 or 1/12 RC models
Makerworld
Marco RC Arena
Free