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NGK 6777 Spark Plug
| Brand | NGK 6777 |
|---|---|
| Resistance | 5000 |
| Ground Electrode Tip Design | Taper cut |
| 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 | Imr9c-9h |
| Stock Number | 6777 |
| Fits | — |
Laser iridium design. Iridium center electrode helps deliver precise, consistent spark performance.
OE supplier heritage. Built by NGK, a long-time original equipment spark plug manufacturer.
Standard configuration. Flat seat and stud terminal for a straightforward spark plug replacement.
Cross-references AMS Automotive 6777, Atlantic Automotive Engineering 5627 and DENSO Auto Parts 5369 for the same application. See all 6.
NGK Laser Iridium Spark Plug 6777
NGK Laser Iridium Spark Plug 6777 is built for precise ignition performance in modern gasoline engines. It combines an iridium center electrode tip with a nickel ground electrode and a flat seat design to support consistent spark delivery and stable combustion.
As part of NGK’s Laser Iridium Spark Plug line, this plug reflects the brand’s OE-focused engineering and broad coverage across domestic and import applications. The 6777 part number is also referenced as IMR9C-9H for catalog matching and service lookup.
Key Features
- Laser Iridium spark plug with iridium center electrode tip material
- Nickel ground electrode with standard configuration and taper cut tip design
- 5000 ohm resistance for ignition system compatibility
- Pre-gapped to .036 for specified applications
- 10 mm thread diameter, .75 reach, flat seat, and 5/8 hex size
- Stud terminal type for direct connection in supported ignition setups
Detailed Product Overview
NGK 6777 is a Laser Iridium spark plug engineered around OE-style construction and durable materials. The copper core center electrode helps manage heat transfer, while the iridium tip supports long-term spark consistency. With a manufacturer heat range of 9, this plug is specified for engines that require that exact thermal range and plug geometry.
This part cross-references DENSO Auto Parts 5369 for the same application. For buyers searching by vehicle, this NGK spark plug 6777 is a relevant replacement option when servicing Honda Civic and similar applications that call for the IMR9C-9H specification.
Common Problems This Part Helps Address
- Misfires caused by worn or eroded spark plug electrodes
- Hard starting from weak or inconsistent ignition output
- Rough idle related to degraded spark delivery
- Reduced fuel efficiency from incomplete combustion
- Loss of throttle response from aged ignition components
Installation Notes and Tips
Verify the required thread diameter, reach, seat type, terminal style, and heat range before installation. Confirm the gap specification against the vehicle service information, especially when replacing plugs in Honda Civic applications or other engines that use the IMR9C-9H cross-reference. Use proper spark plug service procedures to avoid thread damage and ensure correct torque.
Quality Assurance
NGK is a long-established OE supplier with extensive North American and global manufacturing and distribution support. The brand’s ignition expertise and OE-oriented standards make this spark plug a dependable service part for vehicles that specify NGK 6777.
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