NGK ILZFR6C-K Laser Iridium Spark Plug – Stock No. 6645
The NGK ILZFR6C-K is a high-quality Laser Iridium spark plug designed for reliable ignition, clean combustion, and long service life. It uses a fine iridium centre electrode and a platinum-tipped ground electrode to reduce wear and keep performance consistent over many miles.
A stable spark helps cold starts, throttle response, and fuel economy. It also lowers the chance of misfires when the engine is under load or at high rpm. The built-in resistor reduces electrical noise that can affect sensors and the radio.
Why choose this plug
– Fine iridium tip needs less voltage, so the spark stays strong as the plug ages.
– Platinum pad on the ground electrode slows erosion and keeps the gap stable.
– OE-grade design for dependable fit and function.
– Pre-set gap – ready to install. Check and adjust only if your vehicle manufacturer specifies.
| Part number | ILZFR6C-K |
|---|---|
| NGK stock number | 6645 |
| GTIN | 087295166451 |
| Category | 686 – Spark Plug |
| Plug type | Laser Iridium (Iridium centre, Platinum ground) |
| Heat range (NGK) | 6 |
| Resistor | Yes |
| Thread diameter | 14 mm |
| Thread reach | 19 mm |
| Hex size | 16 mm |
| Seat type | Gasket |
| Electrode projection | Projected tip |
| Gap | Pre-set (check OE spec) |
| Terminal | Solid terminal nut |
Fitment guidance
This plug is commonly specified for various modern petrol engines that use a 14 mm, 19 mm reach, projected-tip iridium plug with NGK heat range 6. Use the vehicle lookup on our site or check the Vehicle Fitment tab to confirm it suits your exact engine.
Note: Always torque to the vehicle manufacturer’s spec and install on a cold engine.
The price displayed is for a single plug, please add the desired amount to your basket.


