The 51% made in US standard is for the Buy American Act which, 'requires that a product be manufactured in the U.S. of more than 50 percent U.S. parts to be considered Made in USA for government procurement purposes.' For more information, review the Buy American Act at 41 U.S.C. §§ 10a-10c, the Federal Acquisition Regulations at 48 C.F.R. Part 25, and the Trade Agreements Act at 19 U.S.C. §§ 2501-2582.
'For a product to be called Made in USA, or claimed to be of domestic origin without qualifications or limits on the claim, the product must be "all or virtually all" made in the U.S. The term "United States," as referred to in the Enforcement Policy Statement, includes the 50 states, the District of Columbia, and the U.S. territories and possessions.
What does "all or virtually all" mean?
"All or virtually all" means that all significant parts and processing that go into the product must be of U.S. origin. That is, the product should contain no — or negligible — foreign content.' FTC.
If you know about import or export fraud, call Customs’ toll-free Commercial Fraud Hotline, 1-800-ITS-FAKE.