Explosive ordnance system; 5 step block
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 2925-01-094-4771
NSN 2925-01-368-5773
NSN 5998-01-619-3113
NSN 7035-00-392-5417
NSN 5990-01-072-6074
NSN 6105-01-099-9205
NSN 5990-01-116-2181
NSN 4140-01-440-9203
NSN 6620-00-296-6762
NSN 5990-01-147-5225
NSN 6110-00-188-9874
NSN 5855-01-366-2429