NGK AB-6 Spark Plug (Stock No. 2910) – Reliable ignition for classic and industrial engines
The NGK AB-6 is a robust, non-resistor spark plug designed for dependable cold starts and steady combustion. It suits many classic vehicles, stationary engines, and older performance applications that use large 18 mm plugs. It helps improve throttle response and idle stability while resisting fouling during short trips or light-load use.
Use our vehicle lookup to confirm fitment, or check the Vehicle Fitment tab for full details.
- Strong, consistent spark for easier starting and smoother running
- Nickel alloy centre and ground electrodes for long service life
- Copper core for better heat transfer and knock resistance
| Part number | AB-6 |
|---|---|
| NGK stock number | 2910 |
| GTIN | 087295129104 |
| Category | 686 – Spark Plug |
| Thread diameter | 18 mm |
| Thread pitch | 1.5 |
| Reach (thread length) | 12.7 mm (1/2 inch) |
| Hex size | 25.4 mm (1 inch) |
| Seat type | Gasket |
| Heat range | 6 (medium) |
| Resistor | No |
| Electrode material | Nickel with copper core |
| Gap (factory) | 0.6 – 0.7 mm |
| Terminal type | Solid terminal |
| Electrode design | Standard, non-projected |
| Typical applications | Classic cars and bikes, agricultural and industrial engines using 18 mm plugs |
Important: Always set the gap to the engine maker’s spec. Over-tightening can damage the cylinder head tighten to the correct torque.
The price displayed is for a single plug, please add the desired amount to your basket.


