nut and bolt tolerance test piece —

Founded nut and bolt tolerance test piece models & stl files for printing
Adaptable Hex Bolt Wrench
3rDesign Works.com
Restraining Bolt
MakerDan
Lightning Bolt Easy Quick Print
3DManufacturingHub
Brickyard Compatible Bolts
Rexington Beowulf
Wire Nut
r00t4rd3d
SCREW and NUT
Prusa Research