Part: Bolts
Designers: Timothy Schmidt
Tools: Metal lathes


Fastening two or more parts together sometimes requires special tools, electricity or compressed air, sometimes damages the parts themselves, and sometimes cannot be undone.

Fastening two or more parts together should be quick, easy, produce a strong joint, and be a fully reversible process.


Bolts of different lengths are required to join one, two, and three thicknesses of frames to brackets, panels, and each other.

The combination of weld nuts and furniture bolts suggested in How to Build With Gridbeam loosens rapidly and structures built with them begin to wobble quite quickly. A drop of loctite on each nut's threads would help.


A selection of nuts and bolts have been chosen to interoperate with various frames and are listed in the Parts section.

Replimat is currently using hex head bolts and nylock nuts to address the loosening issue.


8mm frame

M3xXX, M3xYY, M3xZZ bolts

38.1mm frame

40mm frame

M12x50, M12x90, M12x130

100mm frame

M25xXX, M25xYY, M25xZZ bolts

Life cycle

Degenerative transformation

Long bolts can be cut to form shorter bolts.

Last use

Stripped, bent, or abraded bolts degrade to abrasive pellets for ball mills.