


⚡ Spark your drive with Bosch’s double iridium edge—where performance meets longevity!
The BOSCH9621 OE Fine Wire Double Iridium Spark Plug combines dual iridium electrodes with 360-degree laser welding to reduce voltage needs by 24% and extend spark plug life by 4X compared to copper alternatives. Featuring nickel-plated corrosion-resistant threads and factory pre-gapping, it ensures quick installation and optimal performance. Designed to meet or exceed OE standards, it fits a wide range of modern gasoline engines including GDI models from Infiniti, Lexus, Mazda, Nissan, and more.




| Brand | Bosch |
| Core Material | Iridium |
| Thread Size | 12mm |
| Top Material Type | Nickel |
| Vehicle Service Type | Car |
| Global Trade Identification Number | 00028851034258 |
| Automotive Fit Type | Vehicle Specific Fit |
| UPC | 028851034258 |
| OEM Part Number | 9621 |
| Manufacturer | Bosch Automotive |
| Model | Spark Plug |
| Item Weight | 1.44 ounces |
| Product Dimensions | 0.94 x 4.02 x 1.06 inches |
| Item model number | 9621_1 |
| Exterior | Machined |
| Manufacturer Part Number | 9621 |
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