Spark Plug Gap Tool 10 12 14 16mm Universal Adjuster

A spark plug gap tool used to adjust the side electrode on threaded spark plugs to the setting required during servicing. It gives a more controlled way to make small gap adjustments than bending the electrode by hand, helping when fitting new plugs or checking used ones.

Used for routine vehicle maintenance, ignition servicing and general garage work, this tool suits anyone working on cars, bikes, small engines or other equipment with threaded spark plugs in common sizes. When replacing plugs, checking misfire issues or carrying out a service, it helps you set the gap with a feeler gauge and make a measured adjustment rather than relying on guesswork.

The tool fits 10mm, 12mm, 14mm and 16mm threaded spark plugs, so it covers a wide range of common applications with one adjuster. To use it, place the plug into the tool, choose the correct feeler gauge thickness, then turn the adjustment knob until the side electrode is compressed to suit the setting needed. That simple process makes repeat adjustments easier to manage and is useful for regular maintenance where accurate plug setup matters. Covering several common thread sizes also means there is less need to keep separate adjusters for different jobs.

Spark plug gap tool specifications

• Fitment: Works with 10mm, 12mm, 14mm and 16mm threaded spark plugs.
• Function: Compresses the side electrode to help set the required spark plug gap.
• Use: Operates alongside a feeler gauge to check and adjust gap thickness.
• Design: Uses an adjustment knob for more controlled movement during setup.
• Application: Useful for servicing, plug replacement and ignition maintenance.

A practical choice for regular maintenance and repair work.