NGK B6S Spark Plug – NGK Stock No. 3510
The NGK B6S is a dependable, standard-type spark plug for classic cars, bikes, and small engines. It delivers a clean, consistent spark for easier starts, smooth idle, and steady performance under everyday use.
Built with a nickel alloy centre electrode and copper core, it sheds heat well and resists fouling. This plug is non-resistor, so it suits older ignition systems and many carb-fed engines. Always check your vehicle’s required plug type and heat range before fitting.
- Stable ignition for reliable starting and smooth running
- Durable nickel construction with copper core for good heat transfer
- Non-resistor design for classic and simple ignition systems
Technical specifications
| Brand | NGK |
| Part Number | B6S |
| NGK Stock Number | 3510 |
| GTIN | 087295135105 |
| Category | 686 – Spark Plug |
| Thread Diameter | 14 mm |
| Seat Type | Flat gasket |
| Hex Size | 20.8 mm (13/16 in) |
| Heat Range (NGK) | 6 |
| Resistor | No |
| Centre Electrode | Nickel alloy, copper core |
| Ground Electrode | Nickel |
| Gap | Factory set – adjust to the vehicle specification |
| Tip Design | Standard, non-projected |
Note: Some modern ignition systems and audio-sensitive applications require resistor plugs. If in doubt, use the vehicle lookup on our site or see the Vehicle Fitment tab to confirm.
The price displayed is for a single plug, please add the desired amount to your basket.


