48 CFR § 25.101 - General.
(a) The Buy American statute restricts the purchase of supplies that are not domestic end products. For manufactured end products, the Buy American statute and E.O. 13881 use a two-part test to define a domestic end product.
(1) The article must be manufactured in the United States; and
(i) Except for an end product that consists wholly or predominantly of iron or steel or a combination of both, the cost of domestic components must exceed 55 percent of the cost of all the components. In accordance with 41 U.S.C. 1907, this domestic content test of the Buy American statute has been waived for acquisitions of COTS items (see 12.505(a)) (but see paragraph (a)(2)(ii) of this section).
(ii) For an end product that consists wholly or predominantly of iron or steel or a combination of both, the cost of foreign iron and steel must constitute less than 5 percent of the cost of all the components used in the end product (see the definition of “foreign iron and steel” at 25.003). The cost of foreign iron and steel includes but is not limited to the cost of foreign iron or steel mill products (such as bar, billet, slab, wire, plate, or sheet), castings, or forgings utilized in the manufacture of the end product and a good faith estimate of the cost of all foreign iron or steel components excluding COTS fasteners. This domestic content test of the Buy American statute has not been waived for acquisitions of COTS items in this category, except for COTS fasteners.
(b) The Buy American statute applies to small business set-asides. A manufactured product of a small business concern is a U.S.-made end product, but is not a domestic end product unless it meets the domestic content test in paragraph (a)(2) of this section.
(c) Exceptions that allow the purchase of a foreign end product are listed at 25.103. The unreasonable cost exception is implemented through the use of an evaluation factor applied to low foreign offers that are not eligible offers. The evaluation factor is not used to provide a preference for one foreign offer over another. Evaluation procedures and examples are provided in subpart 25.5.