Copper 122 Round Tube 3/8" OD x 0.035" wall Retail Price

About 122|Phosphorus-deoxidized copper (99.9% copper, 0.02% phosphorus). The phosphorus removes dissolved oxygen, making this the standard copper for brazing and welding applications where C110’s residual oxygen would cause embrittlement. Electrical conductivity drops to about 85% IACS due to the phosphorus — a meaningful penalty for electrical applications but irrelevant for plumbing, heat exchangers, and gaskets. Machines the same as C110 (badly). Used for plumbing tube, heat exchanger tubing, and any brazed copper assembly. Compare to C110 (better conductivity, can’t braze in reducing atmospheres) and C101 (oxygen-free, highest conductivity).

About Round Tube|Hollow cylindrical stock for sleeves, bushings, spacers, and hydraulic cylinders. DOM (drawn over mandrel) tubing machines well and holds tight tolerances. Welded-seam structural tube is for cutting and welding, not precision work.