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NGK 7556 Spark Plug
| Brand | NGK 7556 |
|---|---|
| Resistance | 5000 |
| Ground Electrode Tip Design | Square platinum electrode - high ignitability |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Stud |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Iridium |
| Pre-Gap Size | .036 |
| Ground Electrode Quantity | 1 |
| Hex Size | 5/8 |
| Insulator Height | 50.00 |
| Manufacturer Heat Range | 9 |
| Seat Type | Flat |
| Reach | .75 |
| Thread Diameter | 10.00 |
| Part Number | Imr9e-9hes |
| Stock Number | 7556 |
| Fits | — |
Laser iridium design. Iridium center electrode promotes precise, consistent ignition.
Copper core construction. Helps transfer heat efficiently for stable spark plug performance.
OE supplier heritage. Backed by NGK's original-equipment standards and decades of expertise.
Cross-references NGK 7556, 31912-MFL-003 and VUH27D for the same application. See all 4.
NGK Laser Iridium Spark Plug 7556
NGK 7556 is a Laser Iridium spark plug built for precise ignition performance in modern gasoline engines. It combines an iridium center electrode with a square platinum ground electrode design for high ignitability, along with a 0.036 in. pre-gap and 5,000 ohm resistance for stable spark delivery.
As part of NGK’s Laser Iridium Spark Plug line, this plug reflects the brand’s OE-focused approach to ignition components. NGK 7556 is a direct replacement option for drivers servicing vehicles such as Honda Civic and Acura applications that call for IMR9E-9HES specifications.
Key Features
- Laser Iridium spark plug from NGK
- Part number 7556 / IMR9E-9HES
- Iridium center electrode tip for consistent ignition performance
- Square platinum ground electrode with high ignitability design
- 0.036 in. pre-gap for specified applications
- 5,000 ohm resistance
- 10 mm thread diameter, 0.75 in. reach, flat seat
- 5/8 in. hex size with stud terminal
Detailed Description
NGK 7556 is engineered as a secondary ignition service part for engines that require a fine-wire iridium plug with OE-style dimensions. The copper core center electrode supports heat transfer, while the nickel ground electrode core and single-ground configuration help maintain dependable spark characteristics under normal operating conditions. With a manufacturer heat range of 9, this plug is specified for applications that require that exact thermal range and thread fitment.
This part cross-references Honda/Acura OE-style applications such as 31912-MFL-003 and VUH27D for the same application. When servicing Honda Civic or Acura models, verify the engine code and plug specification against the vehicle’s original requirements before installation. NGK 7556 is also listed under part number IMR9E-9HES.
What It Helps Address
- Misfires caused by worn or fouled spark plugs
- Hard starting from weak or inconsistent spark output
- Rough idle related to degraded ignition performance
- Reduced throttle response from aging secondary ignition components
- Service intervals where the original plug specification calls for iridium construction
Installation Notes and Tips
Confirm thread diameter, reach, seat type, and heat range before installation. Use the specified gap for the application and inspect the ignition coil, boots, and plug wells for wear or contamination during service. For Honda Civic and Acura fitments, match the original plug code and engine requirements to avoid drivability issues.
Quality Assurance
NGK is a long-standing OE supplier and manufacturer of spark plugs for domestic and import vehicles in North America. Its manufacturing and distribution network supports OE-level standards for durability and operational performance across a wide range of automotive applications.
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