If this is steel then the piece could/should be Blanchard ground.
There is also a device called an Auto-collimator. This is a large movable lapping device that laps in surface plates for Metrology inspection labs. (I have never seen this done, only a picture in an old text book)
Most surface plates are accurate and flat to within .0005 inches. The largest surface plate I have ever seen is a 6 foot by 12 foot granite plate.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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