Description
NGK ZGR5A Spark Plug – Stock No. 5839
The NGK ZGR5A is a reliable, road-ready spark plug for petrol engines. It uses a copper core for better heat control and a durable nickel alloy tip. The built-in resistor reduces radio interference and helps the ignition system run cleanly.
You can expect smooth cold starts, steady idle, and consistent performance mile after mile. It is a direct replacement where ZGR5A is specified.
Why it matters
- Stable spark for dependable starting and clean combustion
- Resistor design helps protect electronics and reduces radio noise
- Copper core improves heat dissipation for consistent performance
Technical specifications
| Part number | ZGR5A |
| NGK stock number | 5839 |
| Category | 686 – Spark Plug |
| GTIN | 087295158395 |
| Thread diameter | 14 mm |
| Thread pitch | 1.25 |
| Reach (thread length) | 19 mm |
| Hex size | 16 mm |
| Seat type | Gasket |
| Resistor | Yes |
| Heat range | 5 (NGK scale) |
| Electrode material | Nickel alloy with copper core |
| Electrode configuration | Standard J-gap |
| Factory gap | 0.8 mm (check and adjust to vehicle spec) |
| Terminal type | Standard SAE |
Fitment guidance
Use this plug only in engines that specify NGK ZGR5A. Vehicle fit can vary. Use our vehicle lookup to confirm, or check the Vehicle Fitment tab for full details.
Note: Always confirm gap and torque to your vehicle’s service manual. Over-tightening can damage the cylinder head.
The price displayed is for a single plug, please add the desired amount to your basket.
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