Analysis
HTS 5001.00.00 covers silkworm cocoons suitable for reeling under heading 5001 (silkworm cocoons suitable for reeling).
The normal trade relations rate here is zero, shared by about 62% of the 13 tariff lines in chapter 50, a useful check when a neighbouring dutiable line is a candidate. Chapter 99 measures such as Section 301 or 232 can still apply on top, depending on where the goods come from.
It is the only US line under subheading 5001.00, 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 5001.00 points straight here.
Census statistics map these goods to NAICS 112990 (All Other Animal Production). That concordance is how imports of this line are compared with US output.
Every edition we compared, from Jan 2023 to Oct 2026 (Rev. 22), shows the same general rate of Free.