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 6220-00-635-8818
NSN 4140-01-486-3873
NSN 6645-01-572-4475
NSN 5990-01-500-5412
NSN 4140-00-608-1736
NSN 5945-01-650-6411
NSN 6145-00-366-5790
NSN 6650-00-960-5040
NSN 5930-01-416-4268
NSN 6220-01-486-9591
NSN 6150-01-302-9070
NSN 6110-01-400-4207