Per astm-a-513 type 1026
A straight, hollow product, welded or seamless, of round, square, or any other cross section and continuous periphery, which does not conform in cross sectional dimensions to recognized pipe standards, or those in tables 1 through 10, appendix c, fiig a004a. It is designed to convey fluids, gasses, and/or semisolids. It may be rolled into coils for ease in handling. For items designed to join a tube or tube fitting to another tube, pipe, or hose or fitting, see adapter (as modified); coupling (as modified); or nipple (as modified). Excludes tube, bent (as modified); pipe, metallic; spacer, sleeve; metal bar (hollow); and items with fittings, except end protectors.
NSN 5960-01-184-3436
NSN 5985-01-461-8296
NSN 4140-01-218-5919
NSN 5910-01-152-2051
NSN 6145-00-530-8427
NSN 5915-01-231-3354
NSN 5996-01-027-0702
NSN 5975-01-512-2956
NSN
NSN 5910-01-624-3977
NSN 5960-01-408-6290
NSN 5910-00-889-6541