NGK BP6FS Spark Plug – Stock No. 3512
The NGK BP6FS is a standard copper-core spark plug with a projected tip. It is a reliable choice for smooth starting and consistent combustion in many classic petrol engines and some marine applications. Use the vehicle lookup to confirm fitment, or check the Vehicle Fitment tab for full details.
| Part number | BP6FS |
| NGK stock number | 3512 |
| GTIN | 087295135129 |
| Category | 686 – Spark Plug |
| Thread diameter | 14 mm |
| Thread reach (to gasket) | 19 mm (3/4 in) |
| Hex size | 16 mm (5/8 in) |
| Seat type | Flat seat with gasket |
| Heat range | 6 (medium) |
| Resistor | No (non-resisted) |
| Tip style | Projected insulator (P) |
| Centre electrode | Nickel alloy with copper core |
| Ground electrode | Standard J-type |
| Factory set gap | 0.8 mm (0.032 in) – adjust to spec if required |
| Terminal | Standard terminal |
| Fuel type | Petrol |
What it does and why it matters
This plug delivers a clean, strong spark to ignite the air-fuel mix. The projected tip helps resist fouling in everyday use. The copper core pulls heat away from the firing end, keeping performance stable across a range of loads and temperatures.
- Smoother starts and steady idle
- Consistent throttle response
- Good anti-fouling in stop-start driving
- Reliable under light tuning and stock setups
Check fitment carefully: Requires a 14 mm thread, 19 mm reach, flat gasket seat, and a non-resistor plug specification. Always set the gap to the engine maker’s spec.
The price displayed is for a single plug, please add the desired amount to your basket.


