Heading 5508: Sewing thread of man-made staple fibers, whether or not put up for retail sale:

From Chapter 55: Chapter 55

HTS Codes (10-Digit)

HTS Code Description General Duty
5508100000
Sewing thread of man-made staple fibers, whether or not put up for retail sale Of synthetic staple fibers (200)
11.4%
5508200000
Sewing thread of man-made staple fibers, whether or not put up for retail sale Of artificial staple fibers (200)
11%