Tennessee Code Title 67. Taxes and Licenses § 67-6-339

(a) The tax imposed by this chapter does not apply to materials sold to or used by a structural metal fabricator; provided, that such materials are used by the fabricator to fabricate structural metal products for application or use by the fabricator in the performance of a contract outside the state.

(b) For the purpose of this section, “structural metal fabricator” means any person engaged in those activities described under Industry 3441, fabricated structural metal, of Major Group 34 of the Standard Industrial Classification Index of 1972, prepared by the office of management and budget of the federal government.

(c) For the purpose of this section, “fabricated structural metal products” means those products listed under Industry 3441, fabricated structural metal, of Major Group 34 of the Standard Industrial Classification Index of 1972, prepared by the office of management and budget of the federal government.