NGK ZFR6F-11 Spark Plug – Stock No. 4291
This NGK spark plug delivers reliable ignition and consistent performance for everyday driving and light tuning. It uses a copper core for better heat transfer and a durable nickel alloy tip. The factory 1.1 mm gap helps stable cold starts, smooth idle, and clean combustion.
- Strong spark for smooth running and dependable starts
- Resistor design reduces radio interference and protects sensitive electronics
- Heat range 6 suits standard and mildly tuned petrol engines
| Part Number | ZFR6F-11 |
| NGK Stock Number | 4291 |
| GTIN | 087295142912 |
| Category | 686 – Spark Plug |
| Thread Diameter | 14 mm |
| Thread Pitch | 1.25 |
| Reach (Thread Length) | 19 mm |
| Hex Size | 16 mm (5/8 in) |
| Seat Type | Gasket |
| Resistor | Yes |
| Heat Range | 6 (NGK scale) |
| Spark Gap | 1.1 mm (factory set) |
| Centre Electrode | Nickel alloy with copper core |
| Ground Electrode | Nickel, single ground |
| Terminal | Solid type |
Fitment guidance
Use the vehicle lookup on our site or check the Vehicle Fitment tab to confirm this plug matches your engine’s thread size, reach, heat range, and gap requirements.
Installation notes
– Check and adjust gap only if your manufacturer specifies a different setting.
– Tightening torque for 14 mm gasket-seat plugs: typically 18-25 Nm.
Do not over-tighten – this can damage threads or the plug.
The price displayed is for a single plug, please add the desired amount to your basket.


