Surface Plates

Surface plates are a fundamental measuring tool. They provide an extremely flat plane on which other measurements can be made. Surface plates are available in a variety of tolerance classes:

  • Grade AA is the most precise, used in laboratories
  • Grade A is for general inspection work
  • Grade B is for shop floor work

See: ASME B89.3.7-2013 (the older standard was Federal Specification GGG-P-463c)

Granite Surface Plate