Analysis
HTS 5005.00.00 covers yarn spun from silk waste, not put up for retail sale under heading 5005 (yarn spun from silk waste, not put up for retail sale). US Customs collects import statistics for it under 2 ten-digit suffixes, reported in kilograms.
Goods from countries without normal trade relations pay the column 2 rate of 50% instead of nothing, so origin decides between free entry and a 50% duty.
For statistics it divides in two: 5005.00.00.10 for containing 85 percent or more by weight of silk or silk… and 5005.00.00.90 for other (800). Both pay the same duty; the suffix records which kind was imported.
Goods classified here enter the United States duty-free at the general (normal trade relations) rate, as do about 62% of the 13 tariff lines in chapter 50. 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 5005.00, 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 5005.00 points straight here.