Feeler Gauge Set
Representative Photo, actual item may vary
Starrett 572A Thickness Feeler Gage Set .0015-.035" Range 22 Leaves with Spark Plug Wire Gages
Starrett 66B English Thickness Gage 31 Straight Leaves .0015-.035" SAE Feeler Gauge Set
What Is a Feeler Gauge Set?
A feeler gauge set is a collection of thin, precisely ground metal blades — each stamped with its exact thickness — used to measure small gaps and clearances between two surfaces. Whether you're setting valve lash on an engine, checking piston ring end-gap, adjusting spark plug electrodes, or verifying bearing clearances, feeler gauges give you the repeatable, accurate readings that make the difference between an engine that runs perfectly and one that runs poorly or fails prematurely.
Why Feeler Gauges Matter in Automotive Work
Modern engines operate within extremely tight tolerances. Valve clearances, for instance, are often specified to within a few thousandths of an inch. Too tight, and a valve may not seat properly, leading to burned valves and lost compression. Too loose, and you'll hear that familiar ticking noise and suffer reduced performance. A quality feeler gauge set is one of the simplest yet most indispensable tools in any mechanic's toolbox — professional or DIY.
Feeler gauges are also commonly used when:
- Setting distributor point gaps on older ignition systems
- Checking camshaft and crankshaft bearing clearances
- Measuring brake rotor and drum wear tolerances
- Inspecting flatness of mating surfaces like cylinder heads and blocks
- Fitting transmission and differential components during rebuilds
What to Look for in a Feeler Gauge Set
Not all feeler gauge sets are created equal. Key factors to consider include:
- Blade material: High-carbon steel or stainless steel blades resist corrosion and hold their calibrated dimensions longer under workshop conditions.
- Blade count and range: A broader range of blade thicknesses gives you greater versatility. Look for sets covering at least 0.0015" to 0.035" (or equivalent metric range) for general automotive use.
- Accuracy and calibration: Precision-ground blades with traceable tolerances ensure your measurements are reliable — not just approximate.
- Durability of the holder: A sturdy pivot and locking mechanism keeps blades organized and prevents them from fanning out or loosening over time.
- Dual-unit markings: Many quality sets include both inch and metric markings on each blade, reducing the chance of unit mix-ups.
Top Brands for Feeler Gauge Sets
Starrett is widely regarded as the gold standard in precision measuring tools. Founded in 1880, the L.S. Starrett Company has spent over a century refining the manufacture of gauges, micrometers, and related instruments. Their feeler gauge sets are precision-ground to exacting tolerances, making them a favorite among professional machinists and serious automotive technicians who demand accuracy they can trust.
Proto Industrial is a professional-grade hand tool brand with deep roots in industrial and automotive service. Proto's feeler gauge sets are built for the rigors of everyday shop use, offering solid construction and a practical blade range suited to a wide variety of engine and drivetrain service tasks.
A Precision Tool Worth Having
Whether you're performing a top-end engine rebuild, tuning a classic car's points ignition, or simply checking valve clearances during a routine service, having a reliable feeler gauge set on hand ensures the job is done right. Browse our selection below to find the right set for your needs.