Convert imperial 1/4-20 using metric M3 bolt
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I needed to attach something to my box which using imperial 1/4-20 threaded bolts. I made a strong printed substitute.
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In order to clamp my loudspeaker to the pedestal I created I needed imperial ¼-20 bolts.
These bolts are often used for camera fixtures etc. Where I live, no shop carried screws with imperial threads.
Waiting for my bolts to arrive from China, I printed a bolt from McMaster-Carr
It worked, but the plastic broke within minutes.
Next I inserted a M3 bolt inside the Imperial ¼-20 bolt in my CAD model. This is remarkably strong! It holds 20kg easily.
Print it using an organic support in the recessed head for the M3 bolt. (LOVE PrusaSlicer 2.6!)
Fusion file is included to use different sizes etc. I made the printed threads better usable by doing a 0.1mm offset to the threads (applied to all 8 planes forming the two threads).