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 5950-01-419-3429
NSN 5920-01-535-6498
NSN 6320-01-530-4870
NSN 6135-01-142-6456
NSN 5965-01-484-9818
NSN 5835-01-036-4951
NSN 6650-01-633-2430
NSN 6105-01-452-8445
NSN 5905-01-191-7431
NSN 5930-00-891-9755
NSN 4140-00-138-4139
NSN 6110-01-135-6584