# HS code 8466.10: Tool holders and self-opening dieheads > HS code 8466.10 covers tool holders and self-opening dieheads. It sits in heading 84.66 (parts and accessories suitable for use solely or principally with the machines of headings 84.56 to 84.65, including work or tool holders, self-opening dieheads, dividing heads and other special attachments for the machines; tool holders for any type of tool for working in the hand) in chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts thereof). Other goods of heading 84.66 are classified under 8466.20 (work holders), 8466.30 (dividing heads and other special attachments for machines), 8466.91 (other, for machines of heading 84.64), 8466.92 (other, for machines of heading 84.65) or 2 others. National tariff lines under 8466.10 are live on border.bot for the United States (3 lines, also used by 1 other country). Source: https://border.bot/hs-codes/846610 Last updated: 11 October 2026 [HS codes](https://border.bot/hs-codes) / [Chapter 84](https://border.bot/hs-codes/84) / [84.66](https://border.bot/hs-codes/8466) / [8466.10](https://border.bot/hs-codes/846610) ## Key facts - HS code: 8466.10 - Covers: Tool holders and self-opening dieheads - Heading: [84.66: Parts and accessories suitable for use solely or principally with the machines of headings 84.56 to 84.65, including work or tool holders, self-opening dieheads, dividing heads and other special attachments for the machines; tool holders for any type of tool for working in the hand](https://border.bot/hs-codes/8466) - Chapter: [84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof](https://border.bot/hs-codes/84) - Edition: HS2022 - Duty in the United States: [See its 3 lines](https://border.bot/countries/united-states/hs-codes/846610) ## What this code covers HS code 8466.10 covers tool holders and self-opening dieheads. The legal text of the subheading is “Tool holders and self-opening dieheads”, in HS2022. ## What it doesn’t cover Other goods of heading 84.66 are classified under 8466.20 (work holders), 8466.30 (dividing heads and other special attachments for machines), 8466.91 (other, for machines of heading 84.64), 8466.92 (other, for machines of heading 84.65) or 2 others. - [8466.20](https://border.bot/hs-codes/846620) Work holders - [8466.30](https://border.bot/hs-codes/846630) Dividing heads and other special attachments for machines - [8466.91](https://border.bot/hs-codes/846691) Other: For machines of heading 84.64 - [8466.92](https://border.bot/hs-codes/846692) Other: For machines of heading 84.65 - [8466.93](https://border.bot/hs-codes/846693) Other: For machines of headings 84.56 to 84.61 - [8466.94](https://border.bot/hs-codes/846694) Other: For machines of heading 84.62 or 84.63 ## How it is structured 8466.10 is a six-digit subheading. Its first two digits, 84, are the chapter; the first four, 8466, are heading 84.66; the last two, 10, identify the subheading within the heading. Countries add their own digits after these six for their national tariff lines. - Chapter 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof - Heading 84.66: Parts and accessories suitable for use solely or principally with the machines of headings 84.56 to 84.65, including work or tool holders, self-opening dieheads, dividing heads and other special attachments for the machines; tool holders for any type of tool for working in the hand - Subheading 8466.10: Tool holders and self-opening dieheads ## In other countries National tariff lines under 8466.10 are live on border.bot for the United States (3 lines, also used by 1 other country). - [United States](https://border.bot/countries/united-states/hs-codes/846610): 3 lines, used by 1 other country - Previous subheading: [8465.99](https://border.bot/hs-codes/846599) Other: Other - Next subheading: [8466.20](https://border.bot/hs-codes/846620) Work holders ## Frequently asked questions ### What does HS code 8466.10 cover? HS code 8466.10 covers tool holders and self-opening dieheads. ### Which heading and chapter is HS code 8466.10 in? HS code 8466.10 is in heading 84.66 (parts and accessories suitable for use solely or principally with the machines of headings 84.56 to 84.65, including work or tool holders, self-opening dieheads, dividing heads and other special attachments for the machines; tool holders for any type of tool for working in the hand) in chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts thereof). ### Where are goods of heading 84.66 classified when 8466.10 doesn’t fit? Other goods of heading 84.66 are classified under 8466.20 (work holders), 8466.30 (dividing heads and other special attachments for machines), 8466.91 (other, for machines of heading 84.64), 8466.92 (other, for machines of heading 84.65) or 2 others. ### Which countries’ tariffs list national lines under HS code 8466.10? National tariff lines under 8466.10 are live on border.bot for the United States (3 lines, also used by 1 other country). ## Sources and updates The Harmonized System legal text comes from border.bot release 2 (edition HS 2022), imported from a file, and has been live since 11 October 2026. This page was last updated on 11 October 2026. Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling. Machine-readable: https://border.bot/hs-codes/846610.json