Seam 02
Seam 02 : A straightline longitudinal crack or opening extending radially inward from the original outside surface. The seamless tube-making process generally imparts a spiral path to the seam, but this is not usually noticeable in the threaded area. Seams may be caused by ingot cracks, surface pits on ingots, subsurface blowholes, or poor heating practices. (RP 5A5)
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