The standard spark plug socket you’ll need for a BPR5ES is 16mm (5/8 inch).
The BPR5ES is an NGK spark plug with a 14mm thread diameter and a 16mm hex across the flats, a combination that is common across many automotive and motorcycle applications. This plug is part of NGK’s BPR series and is used in a wide range of engines, often chosen for reliability and performance.
Specifications of the BPR5ES
Key dimensions to know when shopping for tools and performing maintenance:
- Thread diameter: 14mm (about 0.551 inches)
- Hex across flats: 16mm (about 5/8 inch)
- Reach: typically around 19mm (about 0.75 inches)
- Type: resistor-type plug, with manufacturer-recommended gaps varying by engine
Hex size and socket compatibility
The critical factor for socket selection is the hex size. For the BPR5ES, the hex is 16mm, so you’ll want a 16mm spark plug socket (often sold as a 5/8" socket in imperial tooling). Using an insert-equipped socket helps protect the ceramic and makes removal easier in tight spaces.
To ensure you’re using the correct tool, verify the plug’s hex with its official specifications or measure across the flats of the hex portion. If in doubt, consult your vehicle’s service manual or NGK’s product datasheet for your exact engine model.
Practical steps to verify before you work
Follow these steps to confirm you’re using the right socket and approach:
- Check the plug’s hex size on the plug itself or in NGK’s datasheet for the BPR5ES to confirm it is 16mm.
- Use a 16mm spark plug socket (typically a 5/8" internal hex) with a rubber insert or magnet to hold the plug securely.
- Pair the socket with a suitable drive size (3/8" or 1/2" drive) and a long extension; consider a universal joint for hard-to-reach cylinders.
- Ensure the engine is cool before removing plugs to avoid damaging the threads or the ceramic.
Bottom line: For a BPR5ES spark plug, the socket size you should use is 16mm (5/8 inch). If your tool set uses imperial sizing, a 5/8" socket with a spark plug insert is the typical choice, and always verify compatibility with your specific engine model.
Summary
The BPR5ES features a 14mm thread diameter and a 16mm hex across the flats, which translates to using a 16mm (5/8 inch) spark plug socket for installation and removal. Always confirm the exact specifications for your engine in the service manual or NGK datasheet, and use the proper socket, extension, and a protective insert to avoid damage and ensure a secure fit.