About this 3D model

8mm nut output from Giles Bathgate OpenScad Metric Fastners http://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Libraries#Metric_Fastners_by_Giles_Bathgate . It has been trimmed back to work as a Jam Nut basically backing up your 8mm (or 5/16 imperial) to a work similar to a nylon insert lock nut. or you can just use it instead of a real nut in non-critical applications.