Machine bolt/screw/nut STL file library and generation program

This Thing contains links for over 3000 STL files describing machine fasteners. Metric and Imperial, bolts, screws and nuts. Cap, flat, hex and pan heads and also threaded rods. Metric sizes M3 - M12, Imperial sizes #5 - #12 and 1/4" through 1/2". Every size is given with all standard thread pitches e.g, 0.75 mm, 1 mm and 1.25 mm for M8. Each fastener is available in a range of lengths.

In addition, there is a Python package to make custom fasteners, available with a simple GUI.