U.S. imports of Tool Holders & Self-Opening Dieheads for Machines or Hand Tools (HS 846610) totaled $109.1M in August 2026, imported from 52 countries.
Importers of Tool Holders & Self-Opening Dieheads for Machines or Hand Tools paid $13.3M in duties in August 2026, an average duty rate of 12.78% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Tool Holders & Self-Opening Dieheads for Machines or Hand Tools imports of $109.1M in August 2026 ran 22% above the year-to-date monthly average of $89.5M.
Last updated: August 2026 dataPrecision tool-holding systems — including holders for forming and cutting dies (8466100110), replaceable cutting or drill insert holders (8466100130), and self-opening dieheads (8466100175) — are critical consumable accessories in metalworking, threading, and machining operations. Taiwan leads US imports under this heading, with Germany and Vietnam also significant sources; the supplier mix reflects both high-volume production capacity and precision-engineering specialization. Goods from China are subject to Section 301 tariffs, which has accelerated sourcing shifts toward Taiwan and Vietnam for many US machine-shop buyers. Correct classification between tool holders and work holders (heading 8466.20) is a frequent audit issue, as the distinction rests on whether the device grips the cutting tool or the workpiece.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
6.7K import shipments a month
A tool holder secures the cutting tool or die to the machine spindle or turret, while a work holder (8466.20) clamps or positions the workpiece being machined. Collet chucks, boring bars, and diehead assemblies belong under 8466.10; vises, chucks gripping the part, and fixtures holding the workpiece belong under 8466.20. Misclassification between these two subheadings is a common CBP audit finding.
Section 301 tariffs on Chinese-origin tool holders have prompted manufacturers and trading companies to shift production or transshipment to Vietnam, which is not subject to those measures. Importers should nonetheless verify origin documentation carefully, as CBP scrutinizes country-of-origin claims in this product category.
Subheading 1 of 7 in heading 8466
Subheading 846610 · $109.1M of $342.0M
Trade Directory
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8466100175 | Tool Holders and Self-Opening Dieheads, NESOI | $84.6M | 12.88% | 96.48% | $10.9M |
| 8466100130 | Holders for Replaceable Cutting or Drill Inserts | $16.2M | 12.74% | 98.09% | $2.1M |
| 8466100110 | Tool Holders for Forming-Type or Cutting Type Dies | $3.3M | 10.29% | 73.37% | $342K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$109.1MYoY · free account
Exports
$21.4MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $1.0B of Tool Holders & Self-Opening Dieheads for Machines or Hand Tools and exported $260.7M.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
Taiwan and Vietnam together supply 52% of it.
customs district
destination
entry
rate provision · imports
3.8% enters free of duty; duty collected equals 12.78% of imports for consumption.