Explosive ordnance sysem; 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 5999-01-400-5933
NSN 6650-00-395-8712
NSN 5920-01-601-6271
NSN 5999-01-634-0576
NSN 6620-00-185-1671
NSN 5996-01-300-4980
NSN 6620-01-164-4913
NSN 5975-01-319-8212
NSN 2925-01-166-4589
NSN 6145-01-274-2971
NSN 5975-00-815-2160
NSN 5998-01-573-0969