These liquid penetrant test props usually contain at least (4) micro-holes 0.004″ to 0.005″ in diameter by 0.008″ to 0.010″ deep. Holes can be machined in welded plate, pipe, bolts, bevel canopies, c-canopies, socket welds, or any test prop. EDM Notches are also available.
In accordance with U.S. Navy’s NSTR-99 Rev. 3 (Qualification Examination Requirements for Nondestructive Test Personnel).