Feeler Gauges

Feeler gauge sets consist of thin metal blades of known thicknesses used to measure gaps and clearances.  They’re essential for setting spark plug gaps, valve clearances and woodworking machine knives.

What is a feeler gauge used for?
A feeler gauge measures the gap or clearance between two parts, such as spark plug gaps, valve clearances, or precision machine components.

How do I choose the correct feeler gauge thickness?
Refer to the manufacturer’s specification for the required clearance, then select the corresponding blade or combination of blades from the feeler gauge set to match that measurement.

How can I keep my feeler gauges accurate and in good condition?
Wipe blades clean after use, lightly oil them to prevent rust, and store the set closed to protect the edges. Avoid bending the blades unnecessarily, as this can alter their thickness.