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 6645-01-102-2321
NSN 5835-01-588-6533
NSN 6220-01-440-6100
NSN 2925-01-543-0073
NSN 6105-01-489-5498
NSN 6130-01-432-7069
NSN 5835-00-315-3797
NSN 6150-01-507-6549
NSN 6620-00-286-5721
NSN 5975-01-206-1521
NSN 6320-01-029-4220
NSN 6645-01-140-0868