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 6620-01-316-5487
NSN 5990-01-555-6616
NSN 5950-00-115-5445
NSN 5975-01-659-5936
NSN 6135-01-069-2482
NSN 6110-01-162-9677
NSN 6150-01-202-8214
NSN 6105-01-441-2255
NSN 6650-01-418-3228
NSN 6130-00-272-5351
NSN 5945-01-445-9625
NSN 5999-01-441-8357