I've lost (don't ask me how because I don't know) two of the four screws holding a computer chair seat onto the pedestal.
They are roughly 5.84mm in diameter which I take to be M6, thread pitch of
1mm, and thread length of 14mm.
So far I have located a bag of 100 * 12mm at RS for £4.25 (plus whatever shipping).
Seems like a hassle free fix, but this does leave me with 98 spare machine screws.
Ho hum.
Dave R