Analysis
HTS 7316.00.00 covers anchors, grapnels and parts thereof, of iron or steel under heading 7316 (anchors, grapnels and parts thereof, of iron or steel).
There is no general-rate duty on this line, which puts it with roughly 77% of the 250 tariff lines in chapter 73 that are also free. Duty-free at the general rate does not rule out additional duties under Chapter 99, such as Section 301 or Section 232 measures, which depend on the country of origin.
It is the only US line under subheading 7316.00, so the six-digit code used by every Harmonized System country and the eight-digit US line describe the same goods; a foreign tariff or an exporter's invoice showing 7316.00 points straight here.
Goods from countries without normal trade relations pay the column 2 rate of 25% instead of nothing, so origin decides between free entry and a 25% duty.
Census statistics map these goods to NAICS 332999 (All Other Miscellaneous Fabricated Metal Product Manufacturing), an industry of 3,501 US establishments employing 66,282 people, the industry a domestic producer of these goods reports under.