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⚡ Spark your engine’s potential with Bosch Double Iridium – where performance meets longevity!
Bosch 9621 OE Fine Wire Double Iridium Spark Plug delivers superior ignitability with a 360-degree laser-welded ultra-fine iridium firing pin, reducing voltage requirements by up to 24%. It offers 4X longer life than standard copper plugs, features corrosion-resistant nickel-plated rolled threads requiring no anti-seize, and comes pre-gapped for easy installation. Engineered for OE fit and function, it’s compatible with a wide range of modern gasoline engines including GDI technology.



















| ASIN | B005GN1THO |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #543,226 in Automotive ( See Top 100 in Automotive ) #2,898 in Automotive Replacement Spark Plugs |
| Brand Name | Bosch |
| Compatible with Vehicle Type | Car, Truck |
| Core Material | Iridium |
| Customer Reviews | 4.6 4.6 out of 5 stars (169) |
| Gap Size | 0.04 Inches |
| Global Trade Identification Number | 00028851034258 |
| Included Components | spark plug |
| Item Type Name | Spark Plug |
| Item Weight | 0.09 Pounds |
| Manufacturer | Bosch Automotive |
| Manufacturer Part Number | 9621 |
| Manufacturer Warranty Description | Limited |
| Model Number | 9621_1 |
| OEM Equivalent Part Number | 9621 |
| Thread Size | 12mm |
| Top Material Type | Nickel |
| UPC | 028851034258 |
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