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 6645-00-401-5563
NSN 6145-01-607-6165
NSN 6240-01-368-3280
NSN 6105-01-243-0371
NSN 5990-01-550-7827
NSN 4140-00-143-9084
NSN 6110-01-366-9639
NSN 6145-00-088-5884
NSN 5996-01-146-6810
NSN 5915-01-278-9176
NSN 6650-01-387-9381
NSN 6610-00-186-9180