Pacific Seamless Tubing is stocked in both hot and cold finished conditions and typically in heaver wall thicknesses than DOM tubing. Hot finished seamless tubing has lower mechanical properties and less precise tolerances than cold finished tubing. Cold drawing increases strength by cold working the steel which improves machinability and surface finish. A certain amount of eccentricity between ID and OD of all seamless tubing must be expected because of the way it is manufactured, i.e., piercing a hot billet of steel with a mandrel. Be sure to consider eccentricity when calculating machining allowances. PACIFIC seamless tubing is usually stocked in the AISI/SAE 1026 grade. Other grades of both carbon and alloy seamless mechanical tubing are available in certain sizes- ask your PACIFIC representative for availability. Size of seamless tubing is usually specified by OD and wall thickness.