are based on the metric system. A BA0 bolt has is 6mm in diameter, 1mm in pitch and needs a 10.5mm spanner. From here, multiply the pitch by 0.9 to get the pitch of the 1BA screw, and do that again to ...

For the hacker this usually involves an adjustment screw, where the accuracy is determined by the thread pitch. This was not good enough for [Mark Rehorst] who wanted adjustment down to 10 μm for ...