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NGK 1555 Spark Plug
| Brand | NGK 1555 |
|---|---|
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Iridium |
| Electrical Terminal Type | Non-Removable Nut |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Copper |
| Ground Electrode Quantity | 1 |
| Ground Electrode Tip Design | Square Platinum Electrode - High Ignitability |
| Hex Size | 14 bi-hex |
| Insulator Height | 50.00 |
| Manufacturer Heat Range | 8 |
| Part Number | SIZKBR8A8HS |
| Pre-Gap Size | .032 |
| Reach | 26.5 |
| Resistance | 5000 |
| Seat Type | Flat |
| Stock Number | 1555 |
| Thread Diameter | 12.00 |
| Product line | Laser Iridium High Ignitability Spark Plug |
| Fits | BMW |
Laser Iridium design. Iridium center electrode helps deliver precise ignition performance.
High ignitability tip. Square platinum ground electrode promotes efficient spark delivery.
OE supplier heritage. Built by NGK, a long-time original equipment spark plug manufacturer.
Cross-references NGK 1555 and 12 12 0 038 507 for the same application. See all 2.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
NGK Laser Iridium Spark Plug 1555
NGK 1555 is a Laser Iridium High Ignitability spark plug built for precise ignition performance and OE-style durability. It uses an iridium center electrode, a square platinum high-ignitability ground electrode tip, and a 0.032 pre-gap to support consistent spark delivery in modern engines.
Key Features
- Laser Iridium High Ignitability design for stable ignition performance
- Iridium center electrode tip material for long service life
- Square platinum ground electrode tip for improved ignitability
- 5000 ohm resistance for ignition system compatibility
- Copper center and ground electrode core materials
- Flat seat, 12.00 mm thread diameter, 26.5 reach, 14 bi-hex hex size
- Non-removable nut terminal type
Product Details
As part of NGK’s Laser Iridium High Ignitability line, part number 1555 is engineered around a fine-wire iridium center electrode and a platinum-enhanced ground electrode tip to promote reliable spark formation. NGK’s long OE supply history and North American manufacturing and distribution network support the consistency expected from a replacement spark plug for import and domestic applications. This part cross-references BMW 12 12 0 038 507 for the same application.
Common Issues This Spark Plug Can Address
- Rough idle caused by worn or fouled spark plugs
- Hard starting from weak or inconsistent spark output
- Misfire conditions related to degraded ignition performance
- Reduced throttle response from aged secondary ignition components
- Maintenance replacement for vehicles using NGK 1555 or BMW 12 12 0 038 507
Installation Notes and Tips
Verify the specified gap before installation and confirm the plug seat type, thread diameter, reach, and hex size match the engine requirements. Use the correct torque procedure for the cylinder head material and inspect ignition coils, boots, and wiring before installing NGK 1555. For BMW applications and other vehicles using this plug specification, confirm engine code and service interval requirements before replacement.
Quality Assurance
NGK is a major OE spark plug supplier with more than 80 years of automotive experience, and this plug reflects that OE-focused manufacturing approach. Part number 1555 is built to original-equipment standards for durability and operational performance.
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