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Two parts can come out of the same etch chamber at the same preventive-maintenance (PM) cycle and meet Korean customs at different rates. An electrostatic chuck has a line of its own in Korea's tariff — HSK 8486.90-2030, "Electrostatic chuck" — and enters at 0% in 2026 whatever its origin. The vulcanised-rubber O-ring that seals the same chamber is not a semiconductor part in the tariff's eyes: it goes to HSK 4016.93 and carries an applied general rate of 8%. Being bolted to a fab tool does not decide the heading; what the part is, by itself, does.
Nami Tech Solutions (NTS) works on fab equipment parts case by case, against a buyer's parts list and maintenance schedule: we find and qualify producers in China, write the qualification package into the order, and coordinate Korean import clearance through your customs broker or licensed partners. This import guide shows the rules we work to: the economics of OEM, compatible and repaired parts, and the mechanics that decide what each costs at the Korean border.
Disclaimer: This article is general practical information, not legal, customs, patent or export-control advice, and does not guarantee the classification, duty rate or legal treatment of any specific shipment. Verify classification and origin with a licensed customs broker (관세사), and patent questions with counsel. Status as of October 26, 2026; tariff rates and court cases move.
Three Kinds of Part, Three Different Purchases
Maintenance buyers talk about "spares" as one category. In practice the purchase splits three ways, each behaving differently on price, qualification and customs. We found no authoritative published taxonomy, so treat this as a working split, not a standard:
The equipment makers say plainly that spares are a business. Lam Research's Form 10-K for the fiscal year ended 29 June 2025 reports "customer support-related revenue and other" of $6.944 billion out of $18.436 billion in total revenue — about 37.7% by simple division. It was about 40.1% in fiscal 2024 and 38.6% in fiscal 2023. Lam's customer support business group offers "customer service, spares, upgrades, and new and refurbished non-leading edge products". Korea accounted for 22% of Lam's fiscal 2025 revenue; China for 34%.
And they name the competition. The risk-factor section of the same filing refers to meeting installed-base expectations "in the presence of competition from third-party spare parts providers", and warns that export-control-driven localisation in China "could increase competition from domestic equipment and spare parts manufacturers". The OEM itself treats compatible parts as a market it competes in, not a fringe.
What we did not find is a price ratio. No public source we could locate gives a sourced figure for an OEM part's price against a compatible one. The Korean trade press covering the patent disputes below says only that fabs adopt domestic parts to lower unit cost and diversify supply. Any "OEM markup" multiple you read is one we could not trace to a source; your own quotes are the only reliable comparison.
Why the Compatible Market Exists
Two forces push it, in different places.
In Korea it is cost and supply security. According to Electronic Times (전자신문, 19 August 2026), Korean parts makers — silicon etch parts, rings, electrode clamps — have entered the supply chains of Korea's two largest chipmakers directly. In silicon parts for etch tools, direct supply by Korean makers has lifted the aftermarket share to about 30%. That is one segment's share, not a price.
In China it is localisation under export controls. Published estimates of China's localisation measure different things — revenue against installed tools, equipment against components — and the component-level figures we found contradict each other, so we use none as a number. Read qualitatively, as estimates, secondary sources agree on one shape: basic mechanical, gas and vacuum parts are largely supplied domestically in China, while electrostatic chucks, RF power and precision valves are still mostly imported. That suggests where a Chinese compatible source is likely to have production depth, and where it is likely assembling someone else's core component.
What it means for procurement strategy. A compatible source is plausible for a consumable or mechanical sub-part long before a controlled electronic module. Start qualification where the supply base is deep; a broad catalogue does not mean the same depth on every line.
Lam's 10-K adds one sentence that applies to OEM and compatible sources alike: "Some key parts are subject to long lead-times or available only from a single supplier or limited group of suppliers", the filing says. We found no sourced lead-time figure.
The IP Fight Is Happening in Korea Now
Using a non-OEM part is not illegal in itself. The legal risk we found is patent and design-right infringement by the part's maker, and it is live in Korean tribunals.
- Eight disputes, split four and four. Electronic Times reported on 19 August 2026 that Lam Research was in eight patent and design disputes with six Korean parts makers. Korea's Intellectual Property Trial and Appeal Board (IPTAB, 특허심판원) had invalidated four of the contested rights and upheld four, with appeals both ways.
- The parts at issue are ordinary consumables. A design-right suit over an edge ring was awaiting first-instance judgment at the Seoul Central District Court; others concern a C-ring with RF grounding and an electrode clamp.
- One invalidation is on record in detail. The Korea Economic Daily (한국경제, 7 January 2026) reported that IPTAB invalidated a Lam Korean patent covering RF ground-return devices, for lack of inventive step, in a decision reported as dated the previous 30 December. The same Korean parts maker had won a negative scope-of-rights confirmation in July of the previous year; Lam had sued in 2024 seeking an injunction.
What the buyer inherits when a maker loses. Per Electronic Times, a maker that loses may have to stop selling or redesign the part, and may face customer re-qualification. For a fab, an adverse ruling against a supplier can cost a qualification cycle repeated on a part that was already running. We could not confirm whether Korean patent law exposes the user of an infringing part; ask patent counsel before standardising a contested design.
Two further risks we could not document. We found no public OEM document stating that non-OEM parts void a warranty or service contract, and no evidence of RFID or firmware part authentication on fab tools. Read your own service contract before the first compatible part goes in.
Classification: The Heading Decides the Duty, Not the Tool
Heading 8486 covers machines used solely or principally for semiconductor manufacture, with their parts. It looks like a home for every fab spare. It is not.
Section XVI Note 2(a). Under the notes to Section XVI of the Harmonized System (paraphrased here from secondary summaries; we did not retrieve the official text), a part that is itself a good of another heading in Chapters 84 or 85 is classified in that heading in all cases. Heading 84.86 is not among the residual parts headings exempted from that rule. A pump, a valve or a heater that serves a fab tool therefore still goes to its own heading. Only parts that are not goods of any other heading fall to 8486.90 under Note 2(b).
Section XVI Note 1(a) excludes vulcanised-rubber articles used in machinery, which is why seals go to heading 4016; Note 1(g) excludes parts of general use.
Korea's tariff confirms it. HSK has dedicated lines for semiconductor vacuum pumps (8414.10-9010) and for automatic regulators of semiconductor machines (9032.89-4091) — unnecessary if those parts went to 8486.
Rates below are from the Korea Customs Service table applying 1 January to 31 December 2026. "Applied general" is the lower of the basic and WTO concession rates; FTA and RCEP rates need valid proof of origin, claimed by the importer.
A dash means no rate was returned. An FTA or RCEP rate above the general rate is irrelevant; the importer uses the general rate. Three points to carry into a quotation:
- The Korea–China FTA does not zero everything. O-rings stay at 1.6%, valve parts at 5.6%, heater parts at 1.6%, other ceramic articles at 8%.
- RCEP is not generally the better route for Chinese-origin parts. It was equal or worse than the Korea–China FTA on every line we checked except valve parts, where it was lower (4% against 5.6%).
- MFCs are unsettled. The candidates are 9026.10 (flow measuring, 0%), 9032.89 (regulators, 3% on the semiconductor line, otherwise 8%) and 8486.90 (0%). We found no Korean ruling. Get an advance ruling under 관세법 제86조 (Customs Act Article 86, advance classification ruling); our sputtering target guide explains why to file it on the object you will actually import.
Rates apply to customs value, which in Korea is CIF-type whichever Incoterm you buy on, as our Incoterms guide explains.
Repair and Return: A Reduction, Not an Exemption
Sending a module abroad for rebuild is routine; its customs treatment is routinely misdescribed.
제99조 is not the repair route. 관세법 제99조 (Customs Act Article 99, re-importation exemption) exempts Korean exports that come back within two years, but excludes goods repaired or processed abroad.
제101조①2호 is. Goods exported "for the purpose of processing or repair" get a duty reduction under 관세법 제101조제1항제2호 (Customs Act Article 101(1)(ii), reduction for goods processed abroad), subject to criteria set by ministerial ordinance. 제101조제2항제1호 denies the reduction where the goods or their materials already received a duty exemption — but that bar does not apply to repairs under ①2호. (Text in force from 2 January 2026, Act No. 21065.)
How the reduction is computed is the part we could not confirm. We did not retrieve the current text of the Enforcement Decree, 시행령 제119조. Tax tribunal case summaries quoting an older version describe the reduction as the export-declared value of the repaired goods multiplied by the import duty rate — in effect, duty on roughly the repair value. Treat that as a historical reading, not the current rule. The same summaries show disputes turning on a mismatch between the 10-digit HSK code declared on export and on re-import; declare the same code both ways.
Neighbouring cases. A free replacement under a claim is not covered by 제99조 either, as our quality claim guide explains along with the 제106조 refund on returned goods. Spent targets going back for reclaim are discussed in the sputtering target guide.
Export control on the outbound leg. If the module is of US origin and the repair shop is in China, the outbound shipment may need an analysis under the US Export Administration Regulations. The interim final rule published on 5 December 2024 (89 FR 96790) added controls on semiconductor manufacturing equipment that BIS described as covering 24 types. We could not confirm how it treats spare parts sent for repair, nor whether a given part is a Korean strategic item; ask counsel before the first shipment.
Used and refurbished parts. We found no Korean import ban or special certification for used industrial machine parts — not the same as finding that none exists. We could not confirm whether Korea's electrical-product safety law (KC, 전기용품 및 생활용품 안전관리법) reaches powered fab-tool modules; ask your 관세사 first.
What to Write Into the Order
No public standard does the qualification work for you. We found no SEMI standard for the cleanliness of chamber parts in general. SEMI F57 is sometimes cited, but it covers polymer components in ultrapure-water and liquid-chemical distribution systems, not chamber parts. The contract has to carry what a standard would.
Specify the part, not the catalogue number. Drawing revision, material grade, surface finish and coating, tolerances, packaging, and for electrical parts the parameters the tool will see. We found no public failure data on these points; they are things to specify and test.
Name the cleanliness test yourself. Without a governing standard, state the test method, the acceptance limit and the laboratory in the purchase order. A supplier certificate that says "cleaned to semiconductor grade" without a method is not evidence.
Write the qualification sequence down. First-article inspection, material certificates, cleanliness results, a trial through at least one PM cycle, a split-lot wafer comparison — practice, not a published procedure. Our sample evaluation protocol explains why three lots can show a mean moved but cannot characterise how much a process varies.
Compare reliability on a common basis. SEMI E10 defines reliability, availability and maintainability metrics, including mean time between failures (MTBF). Its definitions let you compare OEM and second-source parts with the same arithmetic.
Separate the supplier check from the parts check. A factory audit is not a materials test, as our supplier due diligence checklist sets out document by document.
Write the IP exposure into the contract. Ask for a non-infringement warranty and indemnity, and decide who carries redesign and re-qualification costs if the design is found to infringe.
Fix the HS code and origin before the first lot. Put the agreed HSK code on the documents and require a Korea–China FTA certificate of origin where the line has a reduction.
Agree the claim route in advance. Notice windows and the customs cost of returning a rejected part are in our quality claim guide; how each payment term changes what you hold when you pay is in our payment terms guide.
One note on ceramic chamber parts: susceptors, focus rings and plates in silicon carbide are specified in CVD-grown material for purity; our CVD-SiC parts page shows how we fix inspection items in writing before the order. Pumps, valves, fittings and O-rings for PM maintenance are listed on our other materials page.
What This Page Does Not Say
Some of what makes a second source work we discuss with buyers directly rather than in public:
- which producers in China have actual manufacturing depth for a given part family, and which are resellers;
- current lead times, minimum order quantities and landed costs for specific parts;
- which qualification documents to request, in what order, before the first article ships;
- how classification has been handled in practice for parts that sit between two headings.
Ask us — we answer for your parts list, your tools and your site.
Need a second source for fab spare parts without running the whole qualification yourself? NTS finds and qualifies candidate producers in China, writes the qualification package into the order, cross-checks the classification and FTA position line by line, and coordinates the import with your customs broker. If you already have a supplier, we can audit its qualification package or take over the logistics coordination. Write to [email protected] or use the inquiry form with your parts list or OEM part numbers, drawings, monthly or annual quantity, and the tool and process each part serves.
Frequently Asked Questions
Are all fab equipment parts duty-free in Korea?
No. 8486.90 is 0% in the 2026 table, but a part that is a good of its own heading — pump, valve, heater — goes there under Section XVI Note 2(a), and rubber seals go to 4016.93. Many such lines carry 8%.
Does the Korea–China FTA remove the 8% duty?
On most lines we checked, with valid proof of origin. Not on all: O-rings 1.6%, valve parts 5.6%, heater parts 1.6%, other ceramic articles 8%. RCEP was better only on valve parts (4% against 5.6%).
Can a module sent abroad for repair come back duty-free?
Not under the re-importation exemption. 관세법 제99조 excludes goods repaired abroad. Repairs fall under 제101조제1항제2호 as a duty reduction, and we could not confirm the current computation rule — ask your 관세사 before you ship.
Is it legal to use compatible parts instead of OEM parts?
Not illegal in itself. The risk is infringement by the part's maker: IPTAB invalidated four of eight contested Lam rights and upheld four (reported August 2026). A loss can force a redesign and re-qualification on your side.
Is there a SEMI standard for chamber-part cleanliness?
We found none. SEMI F57 covers polymer components in ultrapure-water and liquid-chemical systems, not chamber parts. Write the test method and limit into the purchase order.
References (Public Sources)
- Lam Research, Form 10-K for the fiscal year ended 29 June 2025, filed August 2025 — customer support revenue, revenue by region, risk factors; a Form 10-K for fiscal 2026 was filed on 7 August 2026 and was not reviewed for this article.
- Electronic Times (전자신문), report on patent disputes between a global equipment maker and Korean parts makers, 19 August 2026.
- The Korea Economic Daily (한국경제), report on the invalidation of a Lam Research patent on RF ground-return devices, 7 January 2026.
- Korea Customs Service tariff rate table (관세율표), rates applying 1 January to 31 December 2026, and standard HSK descriptions — looked up 26 October 2026.
- 관세법 제86조, 제99조 and 제101조, text in force from 2 January 2026 (Act No. 21065); Korean tax tribunal decision summaries quoting an earlier version of 관세법 시행령 제119조.
- Harmonized System, Section XVI Notes 1 and 2 — via secondary summaries, including US Customs and Border Protection ruling H259349 (Note 1(g), parts of general use).
- SEMI E10, Specification for Definition and Measurement of Equipment Reliability, Availability, and Maintainability (RAM) and Utilization; SEMI F57, Specification for Polymer Materials and Components Used in Ultrapure Water and Liquid Chemical Distribution Systems — SEMI standards catalogue.
- US Bureau of Industry and Security, interim final rule on semiconductor manufacturing equipment and advanced computing, 89 FR 96790, 5 December 2024.
- Secondary press and broker reports on China's localisation, 2026 — used qualitatively only; their figures conflict.
