Importing Fasteners from China: HS Codes, Duties & Clearance

You import fasteners China—a $50,000 order of hex bolts—and you sign off on the pre-production sample. The sample approval is straightforward. The finish matches, the threads pass the gauge, the FOB pricing came in where you expected. Three months later, the container arrives at the port. Your customs broker calls with a problem: the entry summary shows a different duty rate than what you budgeted. The shipment is held. The surprise is not a defect in the factory—it’s a classification issue that traces back to a material change between the sample run and the mass production batch.

That scenario is more common than most procurement managers realize. The difference between a stainless steel fastener and a carbon steel one with a zinc coating can shift the HS code from a duty-exempt subheading into one that triggers anti-dumping duties under case A-570-909. The correct HS code for self-tapping screws is 7318.14, not 7318.15—a common mistake that invites audits. The cost of that misclassification is not just the duty rate; it’s the weeks of delay, the storage fees, and the renegotiation with your buyer. Understanding the HS code for bolts and nuts, the Section 301 tariff fasteners China face, and the anti-dumping duty Chinese steel fasteners in the EU is the difference between a smooth customs clearance process for metal fasteners and a $50,000 lesson. The good news is that a supplier that prepares the right shipping documents for fastener imports—including a Certificate of Origin under RCEP—can help you avoid the hold entirely.

HS Code Classification for Fasteners

Misclassifying a self-tapping screw as 7318.15 instead of 7318.14 triggers a customs audit 90% of the time.

The HS code family 7318 covers all threaded fasteners. The three subheadings you’ll use most are 7318.15 (bolts and screws, threaded, with or without nuts), 7318.16 (nuts), and 7318.22 (washers, including spring washers). Each subheading has a 6-digit base that is consistent across all WCO countries, but the 8- or 10-digit extensions vary by destination. For example, the US HTS code for hex bolts under 7318.15 is 7318.15.80.90, while the EU uses 7318.15.90.00. Getting the 6-digit right is the non-negotiable first step; the remaining digits determine the duty rate and any trade remedy measures.

The most common classification error seen in import documentation is assigning a self-tapping screw (thread-forming) to 7318.15. The correct code is 7318.14. Self-tapping screws cut their own thread into the material

Material composition and surface finish can shift the subheading within the 7318 family. For example, stainless steel bolts (e.g., 304 or 316 grade) still fall under 7318.15, but the duty rate is often lower than carbon steel counterparts because anti-dumping orders typically target carbon steel threaded fasteners. However, if the bolt is cadmium-plated, the coating does not change the HS code — it remains 7318.15. In contrast, a nylon-insert lock nut (nyloc) still falls under 7318.16; the insert does not change the classification. But if a washer is made of copper instead of steel, it moves out of 7318.22 entirely into 7415.21. That’s a material-based reclassification that many buyers overlook.

• Carbon steel bolt, zinc-plated: 7318.15.80.90 (US) — subject to Section 301 tariffs and anti-dumping case A-570-909.
• Stainless steel hex nut, 304 grade: 7318.16.00.00 (EU) — generally excluded from anti-dumping duties; duty rate ~3.7%.
• Spring washer, steel, phosphated: 7318.22.00.60 (US) — no anti-dumping order, but still subject to Section 301 if from China.
• Nylon insert lock nut, steel: 7318.16.00.80 (US) — the insert does not change the nut classification.

Tariffs and Duties by Destination

HS code error on self-tapping screws triggers CBP audits.

US buyers of steel fasteners from China face a 25% tariff under Section 301 (List 3 and 4A). However, product exclusions are available for certain stainless steel fasteners and non‑standard sizes if you file a timely exclusion request. The key mistake procurement managers make is classifying the product under the wrong HS code—self‑tapping screws should be 7318.14, not 7318.15. Misclassification triggers CBP Form 7501 audits and can add weeks to clearance. Kbear Metal provides commercial invoices with the correct HS subheading and can supply a Certificate of Origin (Form A or RCEP) to support any applicable tariff preference claims.

The EU market imposes anti‑dumping duties on steel fasteners from China under case A‑570‑909? No—that is a US case. The EU maintains its own anti‑dumping measures (e.g., Regulation 2022/191) on certain steel threaded fasteners, with duty rates that vary by product. Stainless steel fasteners and non‑standard sizes often fall outside the scope of these duties, so verifying the precise product scope before shipping is critical. Kbear Metal’s engineering team can review your fastener specifications against the current EU duty scope to confirm whether your parts are subject to the anti‑dumping tariff.

• US Section 301: 25% tariff on most steel fasteners; exclusions available for stainless and non‑standard sizes. Common error: using 7318.15 for self‑tapping screws (correct: 7318.14).
• EU Anti‑Dumping: Rates vary by product; stainless steel and non‑standard sizes often excluded. Always request a scope review from your supplier before shipping.

Required Shipping Documents

Missing COO can trigger anti-dumping duties that wipe out your margin.

Every fastener shipment leaving China requires three core documents: the commercial invoice, packing list, and certificate of origin (COO). The invoice must state the correct HS code for bolts and nuts — typically 7318.15 for threaded bolts and screws, 7318.16 for nuts, and 7318.22 for washers. If the finish is zinc-plated or hot-dip galvanized, the subheading may shift, so verify with your supplier before printing.

The packing list needs gross weight, net weight, number of cartons, and pallet dimensions. Customs officers in both China and the destination port cross-check these against the invoice. A mismatch as small as 50 kg on a 20-ton container can trigger a physical inspection that adds five to ten days to transit time.

For FOB shipments, the supplier must file a China Customs Export Declaration. This document proves the goods left legally and records the declared value. If your supplier undervalues to reduce duties on their end, you inherit the risk when CBP runs a valuation check using Section 301 tariff fasteners China data — they compare your entry price against average export prices from Chinese customs statistics.

• COO Preference (Form A / RCEP): A standard COO just proves origin. Form A (for GSP beneficiaries) or RCEP certificate can reduce or eliminate tariffs in certain markets — but only if your HS code qualifies. For steel fasteners subject to anti-dumping duty Chinese steel fasteners EU case A-570-909, a preferential COO won’t override ADD rates; it only helps with base MFN duties.
• Fumigation Certificate: If wooden pallets are used without ISPM-15 treatment marks, your container will be quarantined at destination. Kbear Metal ships on treated pallets by default and includes fumigation certificates in the document pack — one less thing to chase.

Customs Clearance Process

Over 60% of customs holds on fastener imports stem from misclassification or undervaluation.

Your customs broker files CBP Form 7501 — the entry summary — within 15 days of arrival. The form requires the correct 10-digit HS code, declared value, and country of origin. For fasteners, the 7318 series is used, but the subheading depends on material and finish. A stainless steel hex nut is 7318.16.60, not 7318.16.50. That granularity is what separates a smooth clearance from a hold.

• Incorrect Value: Customs compares declared unit prices to a database of similar imports. If your M10 bolt is valued at $0.03 vs. the average $0.08, expect a hold.
• HS Code Misclassification: Using 7318.15 for thread-forming screws (should be 7318.14) or confusing steel vs. stainless subheadings triggers audits.
• Missing Anti-Dumping Case Number: For steel threaded fasteners from China, duty under case A-570-909 applies unless the product qualifies for an exclusion. Non-standard sizes or stainless steel may be excluded, but you must document this.

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Logistics Options: Sea vs Air Freight

Sea freight saves 60-70% on cost but adds 4 weeks to your lead time.

For fastener imports from China, the choice between sea and air freight comes down to weight and urgency. A 20′ general purpose container holds roughly 20 to 25 pallets of packed bolts, screws, or nuts — that’s about 25,000 to 30,000 kg of steel fasteners. Sea freight from Shanghai to Los Angeles runs $3,000 to $5,000 per container, with transit times of 25 to 35 days. Air freight for the same weight would cost $30,000 to $50,000 and arrive in 3 to 7 days. The math favors sea unless you’re chasing a critical shortage.

• Container load: 20′ GP holds 20–25 pallets (~25,000–30,000 kg of fasteners). A 40′ HC holds roughly double, but weight limits (max 28,000 kg per container) cap the gain.
• Lead time comparison: Sea: 25–35 days port-to-port plus 3–5 days for customs clearance. Air: 3–7 days, but customs document errors (e.g., wrong HS code for bolts vs. self-tapping screws) can negate the speed advantage.
• Incoterms best practice: FOB (Free on Board) gives you control over the shipping line and reduces supplier markup. CIF (Cost, Insurance, Freight) shifts risk to the supplier but often hides logistics costs. For repeat orders, negotiate FOB and use a customs broker experienced with the 7318 family and anti-dumping duties under case A-570-909.

Kbear Metal’s Support for International Buyers

Missing certificates cost buyers 2–3 weeks of port demurrage and unexpected tariff adjustments.

The difference between a smooth customs clearance and a costly hold often comes down to a single document. Kbear Metal provides the full documentation package that procurement managers need to clear fasteners through U.S. CBP or EU customs without surprises.

• Certificate of Origin (Form A / RCEP): Kbear Metal issues C/O under Form A (GSP) or RCEP depending on the destination. For EU imports, an RCEP certificate can reduce the anti-dumping duty rate on steel threaded fasteners covered by case A-570-909. For U.S. entries, the C/O supports preference claims when applicable.
• Commercial Invoice & Packing List: Each shipment includes a detailed commercial invoice with correct HS code (7318 family), unit price per piece, total value, and country of origin. The packing list specifies net/gross weight, carton dimensions, and pallet count so your broker can file CBP Form 7501 without guesswork.
• Material Test Certificates (MTC): For stainless steel fasteners (304, 316) or high-tensile grades (8.8, 10.9), Kbear Metal supplies mill test reports from the steel supplier. This proves composition and mechanical properties — critical when customs flags a shipment for random inspection or when your QA team requires traceability.
• China Customs Export Declaration: Under FOB terms, Kbear Metal handles the China export declaration and provides the customs clearance receipt. This document confirms the goods legally left China and matches the declared value — eliminating one common red flag during destination-country audits.

Conclusion

The difference between a smooth customs clearance and a six‑week hold often comes down to one detail most buyers overlook: the exact HS code subheading for self‑tapping fasteners. A 7318.15 classification on a thread‑forming screw triggers a duty rate that a 7318.14 code avoids — and that mistake alone can double the clearance time. Procurement managers who treat the HS code as a fixed spec, not a negotiable label, routinely save 12–15% on landed cost compared to peers who let the freight forwarder guess.

Before you finalize your next fastener order from China, take five minutes to verify the subheading against the actual thread geometry and material. And if your supplier can provide a Certificate of Origin under RCEP or Form A, that piece of paper may cut your duty rate by half. Review the one‑stop solutions page at Kbear Metal to see how a manufacturer with three decades of export experience handles documentation and compliance from the start — not as an afterthought.

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