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Surface plates come in three grades: AA, A and B. The AA grade has the best flatness, while grades A and B have respectively 2 and 4 times less accuracy. Grade B is still much flatter than normal surfaces like tables, doors, windows etc. According to this table, a grade B 72"x144" surface has an overall flatness tolerance of 4400 microinch, which is better than 1/200".

I am looking for an intermediate form. Are there also 'grade C' surface plates? Those would be less accurate than grade B surface plates, but more accurate than standard surfaces. They would probably also be cheaper than grade B. Maybe this has a different name than surface plate?

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  • $\begingroup$ Don't think so because at grade B the cost seems to mostly be material anyways. $\endgroup$
    – DKNguyen
    Commented Feb 8 at 17:50
  • $\begingroup$ So where did you get that they come in 3 grades AA, A & B? Would C be number 4? But could you get a machine shop to make you one? $\endgroup$
    – Solar Mike
    Commented Feb 8 at 19:30
  • $\begingroup$ @SolarMike The wiki page probably. In any case, I've never seen anything lower than Grade B for sale just like gage blocks. $\endgroup$
    – DKNguyen
    Commented Feb 8 at 19:46
  • $\begingroup$ @SolarMike I saw that in the table that I linked in the question. $\endgroup$
    – Riemann
    Commented Feb 9 at 12:30
  • $\begingroup$ shop.mitutoyo.nl/web/mitutoyo/en_NL/mitutoyo/1299830885531/… and shop.mitutoyo.nl/web/mitutoyo/en_NL/mitutoyo/1299830885531/… $\endgroup$
    – Riemann
    Commented Feb 9 at 14:05

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