Cute as a button, these button-head hex screws are what we suggest for putting together a project with our slotted extruded aluminum. Use a 2.5mm hex wrench to attach/detach. This length is good for attaching something about 2mm/0.08" thick to 20x20 extrusion.
Comes in a pack of 50. M4-20 threads, 8mm threaded body.
Button Hex Machine Screw - M4 thread - 8mm long - pack of 50 (6:35)
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