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 5999-01-049-9519
NSN 6320-00-731-6134
NSN 5990-00-398-0507
NSN 5920-01-556-0912
NSN 6130-01-274-3601
NSN 6645-01-365-7373
NSN 6145-01-077-4504
NSN 6145-00-210-6257
NSN 5930-00-937-1242
NSN 5920-00-761-0134
NSN 6105-00-965-7828
NSN 5965-01-008-5351