Spark Plug
Huangshan BANQIU Auto Parts Manufacturing Co., Ltd.
Huangshan BANQIU Auto Parts Manufacturing Co., Ltd. was established in 2008 with a registered capital of 5 million.We are a spark plug manufacturing enterprise integrating R&D,production and sales.With excellent product quality and excellent service,our company has developed rapidly in recent years, and our production scale has been expanding continuously. At present,our firm can provide more than 1000 models of spark plugs in 12 categories,such as motorcycle spark plugs,automobile spark plugs,natural gas spark plugs, industrial spark plugs,platinum spark plugs,iridium spark plugs,multi-side electrode spark plugs,V-groove center electrode spark plugs, surface jumping spark plugs and protruding spark plugs.
7x24h Production & Delivery Network
Backed by advanced automated production lines and a strong logistics network, BANQIU Spark Plug operates around the clock to meet worldwide demand.
With distribution centers in multiple regions and partnerships across more than 60 countries, we guarantee fast and stable delivery - supporting your business growth anytime, anywhere.
29000㎡
Factory Area
68M
Annual Output
100+
Export Countries
500+
Overseas Distributors
OEM / ODM / OBM Customization Service
BANQIU offers customized spark plug production according to clients' technical requirements, performance standards, or sample references - including electrode structure, resistance value, heat range, branding, packaging design, and inspection reports. All products are manufactured under ISO/IATF-certified systems, ensuring stable performance and consistent quality. Our engineering team focuses on performance optimization and structural innovation, utilizing advanced double-iridium, double-platinum, and hybrid iridium-platinum technologies for higher ignition efficiency, improved fuel economy, and extended lifespan.
| ELECTRODE MATERIAL | LIFESPAN | MELTING POINT | |||||
| NI-CU |  |
30,000 KM | 1453°C | ||||
| PALTINUM |  |
50,000 KM | 1772°C | ||||
| DOUBULE PLATINUM |  |
80,000 KM | 1772°C | ||||
| IRIDIUM |  |
80,000 KM | 2454°C | ||||
| IRIDIUM-PLATINUM |  |
100,000 KM | 2454°C | ||||
| DOUBLE IRIDIUM |  |
OVER 100,000 KM | 2454°C | ||||
What is Spark Plug？
A spark plug is a device used in an internal combustion engine — that is, an engine that derives its power via exploding gases inside a combustion chamber — to ignite the air-fuel mixture.
The spark plug is positioned at the top of the cylinder, where the air-fuel ratio is compressed. The tip of the plug sits inside the engine, recessed into the side of the cylinder wall. The other end remains outside the engine and is attached to a wire that is also attached to the distributor.
PRODUCT CRAFTSMANSHIP
Ceramics and structures that are resistant to high temperature,high pressure and wear, and can withstand high voltages of more than 39,000 volts.
360° seamless laser fully automatic welding, no false welds, no falling ofand the melting depth reaches 99.9%.
Ultra-fine 0.5 diameter center electrode and side electrode needle weldding process improve ignition performance while ensuring service life.
Needle ignition, ignition is more concentrated, combustion is more compleete,power is stronger and fuel is saved.
Different types of spark plugs
Nickel spark plugs represent the foundation of our product line. Manufactured with a copper core for superior conductivity and heat dissipation, they deliver stable ignition and efficient combustion. BANQIU’s nickel series is designed for reliable everyday performance, with precise electrode forming and automated assembly ensuring consistency across mass production. Through OEM and ODM customization, these plugs can be optimized for various engine types and regional fuel qualities.
BANQIU platinum spark plugs feature a fine platinum disc on the center electrode, providing enhanced wear resistance and longevity. Platinum resists electrode erosion, maintaining a strong and consistent spark over time. These plugs are ideal for modern engines with electronic ignition systems. Through flexible OEM production, we can tailor heat ranges, electrode designs, and thread dimensions to customer specifications.
Our double platinum spark plugs utilize platinum on both the center and ground electrodes, doubling the durability and ensuring uniform ignition throughout their lifespan. This design minimizes misfire risk, improves fuel efficiency, and maintains performance even under harsh driving conditions. BANQIU applies automated welding and precision inspection technology, guaranteeing excellent performance for vehicles with distributorless ignition systems.
BANQIU iridium spark plugs are designed for drivers who demand maximum performance and efficiency. The fine iridium tip, produced with advanced laser welding, ensures precise ignition and exceptional corrosion resistance. Iridium — one of the hardest and most heat-resistant metals — allows these plugs to last significantly longer than conventional types. With our independent iridium processing and resistance-powder patent, BANQIU ensures superior combustion efficiency and reliable cold-start performance for modern engines.
Combining the strengths of both iridium and platinum, these spark plugs feature an iridium center electrode and a platinum ground electrode, providing the best balance between durability and performance. They deliver powerful ignition energy, enhanced acceleration, and improved fuel economy. BANQIU’s advanced thermal riveting and sealing technology ensures each plug withstands extreme pressure and temperature, making them suitable for both premium passenger cars and turbocharged engines.
6. Double Iridium Spark Plugs
At the top of BANQIU’s range, the double iridium spark plugs are the result of cutting-edge metallurgy and precision engineering. Both electrodes are tipped with fine iridium, offering maximum durability, lowest electrode wear, and ultimate ignition efficiency. These plugs excel in high-performance, racing, and turbo engines, where extreme combustion conditions demand unmatched reliability. Using our fully automated assembly and oil-immersed spark testing equipment, every double iridium plug is guaranteed to deliver consistent energy, reduced fuel consumption, and extended engine life.
Spark Plug Specifications
Spark plugs come with a variety of specifications, each designed for a specific application. Here are some key specifications:
Heat Range
The heat range defines the spark plug’s ability to dissipate heat — a crucial factor that affects combustion stability and prevents pre-ignition or fouling.A plug that’s too “hot” may cause carbon buildup or incomplete combustion.A plug that’s too “cold” may lead to pre-ignition due to excessive heat.
BANQIU uses advanced thermal simulation and heat conduction testing to match the optimal heat range for different engine displacements, compression ratios, and working conditions.For OEM / ODM projects, we customize the heat range based on engine parameters such as compression ratio, ignition timing, and fuel type — ensuring ideal working temperature and long-term durability.All plugs are verified through automated sintering furnaces and heat resistance tests, guaranteeing consistent performance even under high-temperature environments across different markets.
Spark Gap
The spark gap directly influences ignition energy and combustion efficiency. A gap that’s too wide can cause misfire, while one that’s too narrow reduces flame propagation.BANQIU employs fully automated gap calibration systems, achieving precision within ±0.02 mm.For ODM projects, we adjust the electrode gap according to the ignition voltage requirements of various systems — from traditional distributor setups to modern COP (Coil-On-Plug) systems — ensuring strong and stable sparks.For high-performance engines, BANQIU also develops twin-electrode and multi-point designs that optimize combustion speed and enhance throttle response.
Thread Size and Reach
The thread is the interface between the spark plug and the engine cylinder head. Its diameter, length, and sealing type directly affect installation depth, heat dissipation, and combustion balance.BANQIU uses precision cold forging and CNC machining to ensure perfect thread geometry, with nickel-plated anti-corrosion surfaces that withstand thousands of installations.We offer thread sizes from M10 to M18, supporting both gasket and tapered seat types.OEM and OBM clients can specify customized thread lengths and tolerances to match engine head designs and ensure proper heat transfer and sealing performance.
Resistor or Non-Resistor
Resistor-type (R) spark plugs are designed to suppress electromagnetic interference (EMI), preventing signal disruption in modern vehicle electronics.BANQIU is the only manufacturer in China with a patented spark plug resistor powder, ensuring resistance stability within ±15% at 10kΩ.
For OEM clients, we provide options for both resistor and non-resistor configurations, depending on the vehicle’s electrical system.For ODM clients, we can develop customized resistance values to suit hybrid systems, motorcycles, and other specialized applications.
Material
The material of the electrodes determines the spark plug’s conductivity, melting point, and wear resistance.BANQIU offers multiple material combinations to fit different
performance levels and market positions:Nickel Alloy: Cost-effective and reliable, ideal for standard applications.Platinum / Double Platinum: Enhanced durability and longevity.Iridium / Double Iridium: Superior ignition and throttle response for high-performance engines.Iridium–Platinum Hybrid: Premium balance of endurance and power.
Using vacuum laser welding and precision sintering technology, BANQIU ensures consistent bonding strength and ignition reliability.For OBM partners, we also offer tiered product strategies — economy, standard, and premium — to support brand differentiation and market segmentation.
Terminal Type
The terminal determines how the spark plug connects to the ignition system.BANQIU offers various terminal types — solid, threaded, removable, and ball-type — compatible with both SAE and DIN standards.For OEM projects, we match terminal configurations to specific ignition system standards.
For ODM projects, we can develop unique terminal structures for specialty engines or tuning markets.All terminals undergo torque and conductivity testing to ensure stable contact under vibration and high-temperature conditions.
Automotive Engines
In the automotive industry, spark plugs are essential for efficient combustion and stable engine performance.
BANQIU Spark Plug offers a full range of nickel, platinum, iridium, and double iridium plugs that fit over 99% of global car models — from economy vehicles to high-performance engines.Each plug is manufactured with laser-welded electrodes, patented resistor powder, and tight heat-range control, ensuring precise ignition and extended lifespan up to 100,000 km.Through OEM customization, we can match plug design to specific compression ratios, fuel types, and emission standards, while OBM partners benefit from tailored branding, packaging, and marketing support to grow their spark plug business globally.
Aircraft Engines
For aircraft piston engines, reliability and safety are paramount. BANQIU Spark Plug develops aviation-grade plugs that feature enhanced insulation, optimized electrode spacing, and heat-resistant nickel-chrome alloys capable of withstanding extreme temperature fluctuations.Our automated spark testing systems and high-voltage endurance inspections ensure that every plug maintains consistent ignition under high altitude and pressure conditions.OEM customers in aviation and UAV sectors trust BANQIU’s engineering expertise to design plugs with precise gap settings and stable resistance performance, ensuring smooth starts, efficient combustion, and safety compliance with international standards.
Marine Engines
Marine engines operate in demanding environments with high humidity and salt exposure. BANQIU Spark Plug designs corrosion-resistant plugs using nickel-plated shells and anti-seize coatings, ensuring long-term reliability even in harsh offshore conditions.
Our plugs are built to maintain consistent ignition under varying loads and temperatures, providing better fuel economy and smoother operation for both two-stroke and four-stroke marine engines.For OEM and ODM clients, we offer custom resistance configurations and insulation materials suited to marine-grade ignition systems, while OBM partners receive product differentiation strategies tailored for boating, fishing, and marine maintenance markets.
Small Engines
Small engines — such as those in motorcycles, lawnmowers, chainsaws, and garden equipment — require compact yet powerful spark plugs. BANQIU Spark Plug produces precision-engineered small-engine plugs with optimized electrode geometry for faster starts and reduced fuel consumption.Our sintered electrodes and heat-controlled ceramics ensure stable ignition even after long idle periods.We provide ODM design flexibility, allowing customers to customize resistance, heat range, and gap dimensions for specific applications, helping equipment manufacturers achieve the perfect balance between power, emission control, and cost efficiency.
Power Generators
For generators — whether portable or industrial-grade — spark plug reliability determines operational stability and fuel economy. BANQIU Spark Plug delivers plugs engineered for continuous operation, offering superior heat dissipation, anti-fouling performance, and stable voltage endurance under prolonged use.Each plug undergoes thermal shock testing and combustion simulation to guarantee long service life and consistent ignition.Through OEM partnerships, we support generator manufacturers in matching plug specifications to engine characteristics, while OBM clients benefit from strong supply chain support, flexible lead times, and technical after-sales service.
Industrial Applications
In heavy-duty and industrial environments — such as natural gas engines, compressors, and power plants — spark plugs must endure extreme temperatures and continuous load cycles.BANQIU Spark Plug produces industrial-grade iridium and platinum plugs capable of maintaining strong ignition over thousands of hours of operation.We provide custom electrode materials, optimized heat ranges, and resistance calibration tailored for different fuels, including LPG, CNG, and biogas.
With ISO/IATF-certified production, advanced resistance measurement systems, and traceable batch management, BANQIU ensures every plug meets strict quality and reliability standards.Our OEM, ODM, and OBM services allow customers to co-develop or rebrand industrial-grade spark plugs with global performance and local competitiveness.
Every engine relies on a precise moment — the spark that ignites power. Spark plugs may look small, but they play a vital role in turning fuel into motion by igniting the air-fuel mixture inside the combustion chamber. Without a reliable spark plug, even the most advanced engine cannot perform efficiently. At BANQIU, we specialize in designing and manufacturing high-performance spark plugs that ensure consistent ignition, optimal combustion, and superior durability. Backed by advanced manufacturing technology and years of OEM, ODM, and OBM experience, BANQIU spark plugs are trusted worldwide to deliver powerful starts, smooth acceleration, and long-lasting engine performance — the true spark behind every journey.
Sparks fly
At the heart of every engine cycle is the spark — the moment when the spark plug releases a high-voltage electrical charge across its electrodes. This tiny but powerful spark ignites the air-fuel mixture inside the combustion chamber, setting the engine in motion. At BANQIU, our advanced double iridium and platinum spark plugs ensure precise and consistent ignition under all conditions. With our exclusive patented resistor powder and high-purity iridium particles, our spark plugs deliver stable voltage, faster ignition, and reduced electromagnetic interference — ensuring your engine starts smoothly every time.
Combustion moves your car
Once ignited, the air-fuel mixture burns rapidly, generating high-pressure gases that push the piston downward — this is what creates engine power. The efficiency and stability of this combustion depend heavily on the quality of the spark plug. BANQIU spark plugs are engineered for maximum combustion efficiency, using optimized electrode geometry and superior thermal conductivity materials. This results in more complete fuel burn, lower emissions, and improved fuel economy. Whether for automotive, marine, or industrial engines, our OEM, ODM,and OBM solutions guarantee that every spark translates into real performance and power.
The cycle continues
As the engine runs, this ignition and combustion process repeats thousands of times per minute. That’s why durability and heat resistance are critical. BANQIU spark plugs are built using advanced sintering and oil-immersed spark testing technologies to ensure they withstand extreme temperatures and long-term wear. The result is a longer lifespan, reduced maintenance,and consistent performance across millions of ignition cycles.From mass production for OEM clients to customized solutions under OBM branding, BANQIU keeps your engines running stronger and longer — spark after spark.
Components of Spark Plug
Terminal
The connection terminal is usually an SAE ‘barrel’ shaped connection, a 4 mm thread or a ’cup design’. The high tension ignition lead or a pencil coil is plugged onto the terminal. This connection allows the high voltage to be transferred to the firing end of the spark plug.
Ceramic insulator
Most spark plugs used today feature a single-ceramic insulator made from aluminium oxide, with other types of ceramic materials like porcelain used in the past. This provides many benefits, including thermal conductivity and superior insulation. Resistance to overheating, thermal and mechanical shock are other stand-out features. It also helps to prevent overheating and provides exceptional resistance against mechanical and thermal shock.
Resistor
In order to ensure electromagnetic compatibility (EMC) and thus the fault-free operation of the onboard electronics, a ceramic resistor is used inside the spark plug as an interference suppression device. It is constructed by a fusion of carbon and glass compounds which form a solid component within the spark plug. It also prevents interference with electronic components that are not located on the vehicle e.g. domestic TV and radios.
Centre electrode
The centre electrode can be made from nickel, copper, chromium and precious metals such as iridium and platinum.
It is connected to the terminal by an internal copper wire, which carries high electrical voltage through the spark plug to the tip of the centre electrode, where it then jumps the small gap to the ground (side) electrode, creating a spark.
Ground (Side) electrode
Once the spark jumps the gap from the centre electrode to the ground electrode, a spark is created which ignites the fuel in the combustion chamber.
The ground electrode can come in a variety of shapes and sizes. Some (multi-ground spark plugs) can even feature two, three and four ground electrodes. These, however, do not create more sparks than a spark plug with one ground electrode.
Gasket
The gasket ring prevents any possibility of combustion gas leaking past the spark plug due to the extremely high combustion pressures. In doing this, it prevents any cylinder pressure losses.
Metal Shell
This is the steel shell which a socket wrench fits around in order to loosen and tighten a spark plug. A plug’s hex head can come in a variety of sizes, which include 13mm, 14mm, 16mm, 18mm, 19mm, 21mm, 22mm, 24mm, 25mm and Bi-Hex 14.0mm.
HOW TO CLEAN YOUR SPARK PLUGS
Your vehicle’s spark plugs play a crucial role in keeping the engine running smoothly. They are essentially the “spark of life” that ignites the air-fuel mixture and powers your car forward. When spark plugs become worn or dirty, your vehicle’s performance and fuel efficiency can decline. To maintain peak engine performance, it’s important to keep your spark plugs clean and in good working condition.
Remove your spark plugs
The first thing you need to do is remove your spark plugs. To do that you’ll need a ratchet wrench and protective wear for your eyes. Then follow the instructions in your owner’s manual to properly remove your spark plugs.
Sandpaper method
The first method for cleaning your spark plugs is the sandpaper method. Use 200 grit sandpaper to rub away any carbon deposits on the end of the spark plugs electrode –the tiny pole on the end of the spark plug.
File method
The file method is similar to the sand paper method. Using a metal file, file away all of the carbon deposits on the electrode. A file should be your next step if sandpaper isn’t enough to rid your spark plugs of carbon buildup.
Wire brush method
In lieu of sandpaper, you can use a wire brush. A wire brush will also help you remove the dirt, oil, and debris around the whole spark plug, not just the electrode.
Carbon cleaner method
Carbon cleaner can be used with a cloth or in conjunction with the sandpaper or wire brush method. To use carbon cleaner, hold the spark plug in a vice-like grip and spray it with carbon cleaner. Then use a cloth or wire brush to remove dirt, debris, and carbon buildup.
Spark plug cleaning machine
A spark plug cleaning machine will sand blast your spark plugs using compressed air. It is an effective method for cleaning spark plugs.
As a professional manufacturer with more than 17 years of experience, BANQIU SPARK PLUG offers a complete range of high-quality spark plugs developed through advanced engineering, precision manufacturing, and strict quality control. With OEM, ODM, and OBM capabilities, we provide customized solutions for global automotive brands, distributors, and performance enthusiasts. Our factory integrates automated assembly, oil-immersed spark testing, side electrode bending, sintering furnaces, and thermal riveting lines — ensuring every spark plug meets or exceeds international standards.
Our certificates
