Description
Engineered to meet the stringent demands of modern high-compression, turbocharged, and direct-injection engines, the Bosch Iridium Spark Plug delivers exceptional ignitability and prolonged service life. Featuring an ultra-fine wire iridium center electrode 360-degree continuous laser-welded onto a corrosion-resistant base, this spark plug requires lower ignition voltage while producing a hotter, more concentrated spark kernel. The continuous laser welding process minimizes thermal stress at the alloy junction, ensuring structural integrity under high combustion pressures and extreme thermal cycling. Built with premium continuous-wave ceramic insulators, nickel-plated anti-seize shells, and copper-core ground electrodes, it provides superior anti-fouling protection, prevents premature misfires, and promotes complete flame propagation. Replacing worn spark plugs with Bosch Iridium restores original engine horsepower, improves cold-start reliability, reduces hydrocarbon emissions, and optimizes fuel economy—making it an indispensable high-demand replacement line for automotive parts distributors, fleet maintenance operators, and professional repair channels globally.
Technical Parameters
| Category | Specifications & Technical Details |
| Center Electrode Diameter & Laser Welding | Specification: 0.6 mm pure iridium alloy ultra-fine needle-type center electrode, with 360° continuous laser welding technology Technical Analysis: The extremely fine electrode tip significantly reduces the breakdown voltage required for spark discharge (quenching effect reduction) and concentrates electric field strength. 360° laser welding blocks high-temperature, high-pressure gas corrosion, eliminates electrode detachment risk, and extends the ignition limit. |
| Heat Range Rating & Thermal Dissipation | Specification: Covers Bosch heat range 3 to 8 wide-range system (equivalent to NGK 5 to 9). Both center electrode and ground electrode feature embedded high thermal conductivity copper cores (Double Copper Core) Technical Analysis: The copper core design greatly broadens thermal adaptability. At low-speed idle, it quickly reaches the 450°C self-cleaning temperature to burn off carbon deposits. During full-load high-speed driving, it rapidly dissipates excess heat, preventing pre-ignition or knocking. |
| Spark Plug Gap & Quenching Area | Specification: Factory-preset precision gap 0.7 mm to 1.1 mm (depending on specific OE matching models), with tolerance controlled at ≤ ±0.05 mm Technical Analysis: Precisely measured and pre-adjusted with optical gauges before leaving the factory — no secondary manual adjustment required. This significantly reduces the quenching area, allowing the flame kernel to propagate throughout the combustion chamber at a faster rate. |
| Ceramic Insulator Dielectric Strength & Ribs | Specification: High-purity alumina (Al₂O₃ > 95%) continuously high-pressure sintered ceramic insulator, with 5-rib anti-flashover corrugated profile on the exterior, dielectric breakdown voltage > 30 kV Technical Analysis: Prevents high-voltage electricity from the ignition coil from arcing along the insulator exterior to the shell (flashover), ensuring 100% of ignition energy is accurately delivered into the combustion chamber even in humid weather or high-voltage ignition conditions. |
| Shell Plating & Installation Torque Standard | Specification: Nickel-plated steel shell with anti-seize protection. Thread sizes M10 / M12 / M14 (pitch 1.25 mm). Specified installation torque 15 Nm to 30 Nm (depending on thread diameter and cylinder head material) Technical Analysis: The nickel-plated shell offers exceptional oxidation resistance and anti-seize capability. No additional anti-seize compound is required during installation or removal, preventing cylinder head thread damage or spark plug airtightness reduction caused by torque deviation. |
Applicable Car Brands & Models
Bosch Iridium spark plugs offer an extended service life of up to 80,000 to 100,000 miles (120,000 to 160,000 km) under normal driving conditions. This is roughly 3 to 4 times longer than traditional copper plugs (30,000 km) and significantly outperforms standard single-platinum plugs in gap erosion resistance.
Most Bosch Iridium spark plugs are factory pre-gapped to precise engine specifications and feature protective plastic sleeves over the threads and electrodes. Due to the extremely fine 0.6 mm iridium tip, manual gapping with traditional coin-style tools is strongly discouraged, as it can fracture or bend the fragile iridium center pin.
Yes. Upgrading to Bosch Iridium spark plugs provides immediate benefits, including faster cold starts, smoother engine idle, improved throttle response, and lower ignition voltage demand on aging ignition coils, provided the heat range and physical thread dimensions match the original equipment (OE) requirements.
Bosch Iridium spark plugs are typically packaged in individual unit boxes within 4-pack or 10-pack trade boxes. For wholesale exports, the Minimum Order Quantity (MOQ) starts as low as 100 to 500 units depending on warehouse inventory, with lead times ranging from 3–5 days for stocked items to 15–30 days for factory container shipments.
