Spark Plug
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Requirement analysis
Product Analysis
Key Points of the Requirement
Define the thread size and reach (M14, M12, or M10), hexagon size, heat range, electrode material (copper-core nickel, platinum, or iridium), and pre-set electrode gap. State the target engine or OE cross-reference number, resistor type (suppressor or non-resistor), and the required standards or homologation. Confirm packaging format (individual boxes, multipacks, or bulk), marking requirements, and whether anti-seize or anti-corrosion coatings are expected on the shell threads.
Cost Structure Analysis
Costs are driven by the ceramic insulator, electrode alloys (precious-metal content for platinum and iridium plugs materially raises price), the nickel-plated steel shell, glass sealing of the center electrode, and assembly under controlled conditions with 100% gap, appearance, and firing inspection. High-speed production lines require large volumes for efficiency, so pricing steps down sharply with quantity. Tooling changes for new thread or insulator designs are uncommon but quoted separately when needed.
Estimated Cost Range
For standard copper-core nickel spark plugs, excluding freight and tax, indicative factory pricing is approximately $0.75–$1.50 per plug for 1,000–9,999 plugs, $0.55–$1.10 for 10,000–49,999, $0.42–$0.85 for 50,000–199,999, and $0.32–$0.65 above 200,000 plugs. Iridium and platinum plugs typically price 2.5–4 times the nickel equivalent. Final quotations depend on electrode material, gap precision, packaging, and commercial terms.
Procurement Considerations
Prioritize manufacturers with IATF 16949 certification and automated lines with 100% gap and leakage testing. Request test reports covering thermal shock of the insulator, vibration durability, ignition voltage consistency, and anti-corrosion salt-spray performance of the shell. Provide OE samples or drawings and the target engine details, and confirm batch-level traceability of electrode materials, tooling ownership, warranty terms, retail packaging design, Incoterms, and delivery destination. Samples should be checked for gap consistency, insulator glaze quality, thread fit, and marking legibility before production approval.
Supplier shortlist
Top 3 matched suppliers
A comparison-ready shortlist balancing quality systems, product capability, capacity, and commercial flexibility.
#1 recommended
Zhuzhou Torch Spark Plug Co., Ltd.
A leading manufacturer of spark plugs in China and a subsidiary of the Weichai Group. The company has over 60 years of experience in R&D and production, supplying major automotive OEMs globally.
#2 recommended
Liben Auto Parts Industrial Co., Ltd.
Established in 1994, Liben is a specialized manufacturer of spark plugs for automobiles, motorcycles, and small engines. They operate advanced automated production lines and export to over 50 countries.
#3 recommended
Fujian Superpower Spark Plug Co., Ltd.
A high-tech enterprise focusing on the research, development, and manufacturing of spark plugs. They provide solutions for various engines including passenger cars, commercial vehicles, and garden machinery.
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