Shop-Grade Feeler and Thickness Gages for Accurate Clearance Measurement at Penn Tool Co.

A worn feeler gage or a coating thickness reading taken by eye rather than by instrument creates the kind of small miss that turns into a warranty claim or a failed inspection down the line. When a clearance or a film build has to meet spec exactly, guesswork isn't a measurement method; it's a liability waiting to surface.

Since 1968, Penn Tool Co. has supplied toolrooms, auto shops, and coating inspectors across the USA with the thickness and feeler gages that turn "looks right" into a verified reading. For over 50 years, we've been the trusted source for gauges built to read true use after use, without drifting out of calibration.

Explore our comprehensive selection of feeler gages and feeler gage sets, including metric feeler gage and long feeler gage blade options, each engineered to deliver precise clearance checks across your most demanding setups. Discover the specialized coating thickness gages, paint thickness gages, dial and digital thickness gages, and feeler gage stock in continuous rolls that keep your inspection bench fully equipped, all offered at competitive pricing to maximize your instrumentation budget without compromising accuracy.

 

Picking the Right Gauge for the Gap You're Checking

• Feeler gages earn their keep in engine bays, machine setups, and anywhere a precise clearance has to sit between two surfaces. Standard sets cover the common thickness range in one folding case.
• A metric feeler gage swaps millimeter graduations for those on imported equipment, while a long feeler gage extends the blade length to reach into tighter or deeper assemblies.
• A paint thickness gage or coating thickness gage reads film build non-destructively, letting inspectors confirm a coat meets spec without cutting into the surface to check it.
• A dial thickness gage gives a fast mechanical readout that needs no battery, ideal for quick floor checks.
• A digital thickness gage adds a numeric display with data-hold for logging readings straight into a quality record.
• When a standard blade set won't reach or cut cleanly to the length a job needs, feeler gage stock in roll form lets a technician cut exactly what the gap calls for.

Round out your bench with our full range of precision measuring tools, from micrometers to indicators.

 

From Blade to Byte: How Gauging Is Evolving

As American manufacturing pushes toward tighter tolerances and fully documented inspection records, the design of professional feeler and thickness gauges continues to advance.

• Bluetooth-Enabled Data Logging: A major trend in coating inspection is standardizing on Bluetooth-enabled coating thickness gauges that log readings directly to inspection software, cutting out manual data entry.
• Corrosion-Resistant Blade Construction: Stainless steel feeler gauge blades are replacing carbon steel in sets used around corrosive or wash-down environments, holding their edge longer under harsh conditions.
• Dual-Scale Blade Markings: Dual-scale metric feeler gauges are now printed with both inch and millimeter markings on the same blade, cutting the need for separate imperial and metric sets.
• Non-Ferrous Probe Compatibility: Coating thickness gauges are increasingly offered with non-ferrous probe options, extending accurate readings to aluminum and other non-magnetic substrates.
• Pre-Cut Custom-Length Stock: Shops are moving toward pre-cut custom-length feeler stock, ordering rolls trimmed to their most common clearance jobs instead of cutting every blade by hand.

 

The Penn Tool Co. Advantage: Uncompromising Precision Standards 

An unmeasured clearance or an unverified coating thickness rarely fails on the spot; it shows up later, as a rattling assembly or a coating that wears through early. Keeping accurate feeler and thickness gages on the bench catches that gap before it becomes a comeback.

50+ years in precision instrumentation shaped how we stock this category, and it carries through the rest of our gaging lineup too, every blade and dial built to give a reading your team can stand behind, job after job.