NGK BPR5EIX Iridium IX Spark Plug – 6597
The NGK BPR5EIX is a high-quality iridium spark plug designed for reliable ignition and long service life. It uses a fine iridium centre electrode to produce a strong, stable spark. This helps cold starts, smooth idle, and clean combustion. It also resists fouling better than standard copper plugs.
Iridium’s hard tip wears slowly, so gaps stay consistent for longer. That means steady performance over more miles with less maintenance.
- Fine iridium tip for a strong, consistent spark
- Projected, resistor design to reduce radio noise and improve idle quality
- Tapered ground electrode for better flame growth
- Trivalent anti-corrosion coating on the shell
Important: Confirm plug size, reach, and heat range match your engine. Handle gap adjustments with care. Do not pry against the iridium tip.
| Part Number | BPR5EIX |
| NGK Stock Number | 6597 |
| GTIN | 087295165973 |
| Category | 686 – Spark Plug |
| Thread Diameter | 14 mm |
| Thread Reach | 19 mm |
| Hex Size | 20.8 mm (13/16 in) |
| Seat Type | Flat seat with gasket |
| Heat Range | 5 (NGK scale) |
| Resistor | Yes |
| Centre Electrode | Iridium, approx. 0.6 mm fine tip |
| Ground Electrode | Nickel alloy, tapered cut |
| Factory Gap | 0.8 mm |
| Terminal Type | Solid terminal |
| Shell Finish | Trivalent anti-corrosion plating |
| Typical Tightening Torque | 18-22 Nm into aluminium heads with new gasket |
Fitment guidance:
– Suitable for petrol engines that specify a 14 mm thread, 19 mm reach, projected resistor plug with NGK heat range 5.
Use our vehicle lookup to confirm exact fitment, or see the Vehicle Fitment tab for full details.
The price displayed is for a single plug, please add the desired amount to your basket.


