A rectangular or square precision tool having a flat working surface(s) of specific flatness. It is used as a datum plane in connection with various layout, inspection, and calibration operations. It may also be used as a lapping plate, but is not grooved. See also block, lapping; plate, duplex, surface and lapping; and plate, lapping.
NSN 5998-01-113-3378
NSN 4140-01-634-0330
NSN 6645-01-295-4373
NSN 7035-00-541-8516
NSN 6650-01-154-1870
NSN 5950-01-504-1230
NSN 5996-00-578-9092
NSN 5985-01-398-9580
NSN 6145-01-626-1989
NSN 6645-01-535-0719
NSN 5999-01-113-8120
NSN 6650-00-920-0332