NGK PFR5J-11 Platinum Spark Plug – Stock No. 4642
This NGK platinum spark plug delivers reliable ignition, smooth idle and consistent performance. It uses a fine platinum centre electrode for a clean, stable spark and long service life. Ideal for daily use and light performance upgrades where dependable spark under load matters.
Expect easier cold starts, reduced misfires and steady combustion. The resistor design also helps cut radio interference.
Always match the exact part number your engine specifies. Do not mix heat ranges.
Why choose this plug
- Fine-wire platinum tip for strong, stable spark
- Long service life with less gap growth
- Resistor construction for cleaner signals and reduced interference
- OE-grade sealing and heat control for reliable running
| Part Number | PFR5J-11 |
|---|---|
| NGK Stock Number | 4642 |
| GTIN | 087295146422 |
| Category | 686 – Spark Plug |
| Thread Diameter | 14 mm |
| Thread Reach | 19 mm |
| Hex Size | 16 mm |
| Seat Type | Gasket |
| Heat Range | 5 (NGK scale) |
| Spark Plug Gap | 1.1 mm |
| Resistor | Yes |
| Centre Electrode | Platinum fine-wire |
| Ground Electrode | Nickel alloy |
| Terminal Type | Solid terminal |
| Tip Projection | Projected |
| Tightening Torque | 25-30 Nm (14 mm thread with gasket, aluminium head) |
| Installation | Hand-tighten to seat, then torque to spec on a cold engine |
Fitment guidance
Use the site’s vehicle lookup or check the Vehicle Fitment tab to confirm this exact part number for your engine. Only install if your owner’s manual or OE reference lists NGK PFR5J-11.
The price displayed is for a single plug, please add the desired amount to your basket.


