六角长螺母

🔩 Hex Long Nuts (High Hex Nuts / Jam Nuts)

🌐 HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Breakdown | Professional Strategy
📌 Part 1: Product Definition & Classification: Do You Know What "Hex Long Nuts" Really Are?

Hex Long Nuts (also known as High Hex Nuts, Double Nuts, or Long Hex Nuts) are threaded fasteners specifically designed with a greater height than standard hex nuts. They are used to: 1. Provide extra thread engagement for safety; 2. Allow for thick washers or multiple layers of materials; 3. Act as jam nuts (self-locking pairs) to prevent vibration loosening; 4. Serve as spacer nuts in structural engineering.

In international trade, they are primarily classified based on Material (Aluminum, Copper, Iron/Steel) and Size (Diameter of shank/thread >6mm vs. <6mm), as well as Thread Type (Standard, Self-locking).

⚠️ Key Distinction:
- If made of Aluminum → Go to Chapter 76 (HS 7616.10);
- If made of Copper → Go to Chapter 74 (HS 7415.33);
- If made of Iron or Steel (including Stainless) → Go to Chapter 73 (HS 7318.16).
- Critical Size Threshold: Whether the thread/shank diameter is ≥6mm or <6mm significantly impacts the sub-code and sometimes the tariff (especially for copper products).

📦 Part 2: HS Code Classification Details (2026 Tariff Authority Match)

(Based strictly on the provided DATA)

🔍 Critical Reminder:
- Material is King: Misidentifying a "Long Nut" as the wrong material (e.g., Aluminum vs. Steel) will lead to complete misclassification.
- The 6mm Threshold for Copper: For copper products, the tariff is the same (50%), but the HS Code changes based on size. Ensure accurate measurement.
- Steel/Nuts: The distinction between Stainless (...60) and Carbon Steel (...85) is crucial for customs valuation and origin rules.

💰 Part 3: 2026 Latest Tariff Rate Breakdown (Detailed Policy Analysis)

✅ Context: Based on the provided tax data (likely US Market with "Steel/Aluminum/Copper Surtax").
✅ Product Origin: China (CN)
✅ Effective Time: 2025/2026 (Per Data Context)

🎯 1. Aluminum Products (7616.10.70.30 & 7616.10.90.30)

Highly favorable for Aluminum exporters due to low base duties.

🎯 2. Copper Products (7415.33.80.10 & 7415.33.80.50)

Highly sensitive to the "Steel/Aluminum/Copper Surtax".

🎯 3. Iron & Steel Products (7318.16.00.85 & 7318.16.00.60)

Includes both standard and stainless steel. The most common fastener category.

🛠️ Part 4: Customs Clearance Practical Advice (Avoiding Pitfalls)

✅ 1. Preparation Checklist (Must-Haves)

✅ 2. Declaration Strategy (The "Golden Rule")

🔥 Rule: "Material First, Size Second, Description Third"

✅ 3. Special Handling Tips

• The "Plated" Trap: If the nut is Steel with Copper Plating, it is NOT Copper. It is Steel. It will be taxed at 57.5%, not 50%. Do not claim "Copper" for plated items.
• The "Aluminum" Trap: If the nut is Aluminum with Zinc Plating, it is still Aluminum. Tax = 0%. Keep the plating specs clear to avoid reclassification.
• Size Measurement: For Copper, measure the Major Diameter of the Thread (e.g., M6 = 6mm, M8 = 8mm).
  • ≥6mm → ...80.10
  • <6mm → ...80.50
• Stainless Steel Nuance: Stainless steel nuts (7318.16.00.60) do not get a lower rate just because they are "stainless". The 57.5% surtax applies.

🌍 Part 5: Global Market Comparison (Quick View)

📌 Conclusion:
- Aluminum Hex Long Nuts are the only profitable category in this dataset (0% tax).
- Steel and Copper Hex Long Nuts face punitive tariffs (50-57.5%).
- Action: If you are importing these to the US market, switch suppliers to non-steel/copper materials or look for third-country manufacturing (e.g., Vietnam, Mexico) to bypass the surtax.

🎯 Part 6: Common Mistakes & Solutions

❌ Mistake 1: Calling "Steel Nuts" "Aluminum" to get 0% tax.
👉 Result: Severe Fraud Penalty + Back Taxes + Criminal Investigation.
✅ Fix: Submit material test reports.

❌ Mistake 2: Claiming "Copper" for "Brass" or "Plated Steel" nuts.
👉 Result: 7.5% Base Duty + 50% Surtax = 57.5% Tax + Audit.
✅ Fix: Be honest about material. Brass usually falls under Copper chapter but check specific sub-rules.

❌ Mistake 3: Ignoring the 6mm threshold for Copper.
👉 Result: Minor code error, but customs may question the size measurement.
✅ Fix: Always include thread diameter in the commercial invoice.

✅ Correct Declaration Example:

"Hex Long Nuts, Material: Aluminum Alloy 6061, Thread Diameter: 8mm, Finish: Anodized, Model: AL-LN-001"
HS Code: 7616.10.70.30
Tax: 0.0%

🚀 Part 7: Final Verdict & Action Plan

🎯 Remember the Formula:

🔹 Aluminum = 0% (Zero Duty)
🔹 Copper = 50% (Huge Surtax)
🔹 Steel = 57.5% (Huge Surtax + Base)

📌 Clearance Suggestion:
1. Verify Material: Get a mill test certificate immediately.
2. Measure Precisely: Ensure thread diameter is accurate (especially for Copper).
3. Optimize Design: If the application allows, switch from Steel/Copper to Aluminum to save 57.5% and 50% in duty costs respectively.
4. Pre-Arrange: Apply for HS Code pre-rulings if unsure about the plating/material mix.

✨ Professional Customs Clearance Starts with Accurate HS Codes!
💼 Save 57% by choosing Aluminum! Don't let duty costs eat your profit!