Description
NGK Iridium IX Spark Plug – ZFR6FIX-11 (Stock No. 6441)
This NGK Iridium IX plug delivers a strong, consistent spark for better throttle response and smoother running. The fine-wire iridium tip needs less voltage to fire, which helps cold starts and reduces misfires. It is a durable upgrade over standard copper plugs.
Use it as a performance-focused replacement where ZFR6F-11 is specified. Always confirm fitment with the vehicle lookup or check the Vehicle Fitment tab.
- Sharper ignition and smoother idle
- Improved cold starting and response
- Long service life compared to standard plugs
Do not force-adjust the electrode gap on iridium fine-wire plugs.
| Part Category | 686 – Spark Plug |
| Part Number | ZFR6FIX-11 |
| NGK Stock Number | 6441 |
| GTIN | 087295164419 |
| Plug Type | Iridium IX, resistor |
| Heat Range | 6 (NGK) |
| Thread Size | M14 x 1.25 |
| Reach (thread length) | 19 mm |
| Hex Size | 16 mm |
| Seat Type | Gasket |
| Projected Tip | Yes |
| Centre Electrode | Fine-wire iridium (approx. 0.6 mm) |
| Ground Electrode | Nickel alloy, tapered cut |
| Terminal | Solid terminal |
| Factory Gap | 1.1 mm (-11 designation) |
| Gap Adjustability | Not recommended on iridium fine-wire tips |
Fitting notes
– Install into a cool engine. Hand-tighten first to avoid cross-threading, then tighten to the manufacturer’s torque specification.
– Use only the specified heat range and reach for your engine.
The price displayed is for a single plug, please add the desired amount to your basket.
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