NGK BKR5EKB-11 Spark Plug – Stock No. 3967
The NGK BKR5EKB-11 is a reliable, long-life spark plug for everyday petrol engines. It uses a durable nickel centre electrode with twin ground electrodes for a consistent spark and steady idle. The 1.1 mm factory-set gap supports clean combustion, smooth starts, and dependable performance over many miles.
This plug has a resistor to reduce electrical noise, which helps protect sensitive electronics such as the ECU and radio. It features a 14 mm thread, 19 mm reach, and 16 mm hex, making it a common size across many engines that specify an NGK heat range 5 plug.
- Stable spark and smooth idle from twin ground electrodes
- Good service life with robust nickel electrodes
- Resistor design helps keep electrical noise low
| Part Number | BKR5EKB-11 |
| NGK Stock Number | 3967 |
| GTIN | 087295139677 |
| Category | 686 – Spark Plug |
| Thread Diameter | 14 mm |
| Thread Reach | 19 mm (3/4 in) |
| Hex Size | 16 mm |
| Seat Type | Gasket |
| Heat Range (NGK) | 5 |
| Resistor | Yes |
| Electrode Configuration | Twin ground electrodes |
| Centre Electrode Material | Nickel alloy |
| Spark Gap | 1.1 mm (factory set) |
| Terminal Type | SAE terminal (nut type may vary by batch) |
Fitment Guidance
This specification is used across many petrol engines that call for a 14 mm thread, 19 mm reach, heat range 5, and a 1.1 mm gap with twin ground electrodes. Please use the site’s vehicle lookup to confirm fitment or check the Vehicle Fitment tab for full details.
Note: Always install to the manufacturer’s torque spec and do not alter the gap unless your vehicle’s service data requires it.
The price displayed is for a single plug, please add the desired amount to your basket.


