Feeler gauges are precision measuring tools used to measure the gap or clearance between two surfaces. They consist of a set of thin, flexible blades of varying thicknesses. Each blade is marked with its thickness, allowing users to select the appropriate blade that fits the desired gap or measures the required clearance. Feeler gauges are commonly used in automotive, machining, and mechanical applications for tasks such as valve adjustment, spark plug gap measurement, and determining proper clearances in mechanical assemblies.

Here are some key features and uses of feeler gauges:

1.      Blade Material: Feeler gauge blades are typically made of high-quality steel, ensuring durability and accuracy in measurements. They are often hardened and ground to maintain their shape and prevent deformation during use.

2.      Blade Thicknesses: Feeler gauges come in sets with multiple blades, each having a specific thickness. The thicknesses can range from fractions of a millimeter to a few millimeters, depending on the specific set. The blades are typically stacked together and bound by a screw or rivet for easy selection and organization.

3.      Flexibility: Feeler gauge blades are designed to be thin and flexible, allowing them to conform to the shape of the gap being measured. This flexibility ensures accurate measurements even in tight or hard-to-reach spaces.

4.      Measurement Technique: To use a feeler gauge, the user selects the appropriate blade that fits the gap or clearance being measured. The blade is then inserted into the gap, and the user checks for a proper fit. The blade should slide into the gap with slight resistance but without excessive force. The blade thickness that fits snugly without being too loose or too tight represents the measured gap or clearance.

5.      Common Applications: Feeler gauges have a wide range of applications, including valve clearance adjustments in engines, setting spark plug gaps, checking bearing clearances, measuring gaps between mating surfaces, and assessing proper clearances in mechanical assemblies and machinery.

Feeler gauges are valuable tools for ensuring precise measurements and proper clearances in various mechanical and automotive applications. They are easy to use, portable, and provide accurate readings for critical adjustments and inspections. Regular maintenance, such as cleaning and proper storage, will help to maintain the accuracy and longevity of feeler gauges.