Measuring and Layout — FAQ
What size feeler gauge set do I need for basic DIY automotive work?
A 32-blade set covering 0.0015"–0.040" handles most automotive tasks including spark plug gaps (0.020"–0.040") and valve clearances. Add angled blades if you work on modern overhead cam engines with restricted access.
What's the difference between tapered and straight feeler gauges?
Tapered blades vary in thickness along their length, letting you find exact clearances by insertion depth. Straight blades have uniform thickness—perfect for known gaps like spark plugs. Tapered excels at measuring; straight excels at verifying.
Can I use one feeler gauge set for both automotive and guitar setup?
Yes, but choose carefully. Automotive sets cover the range needed for guitars (0.010"–0.035"). Tapered blades work best for guitar nut slotting. Ensure the steel is thin and flexible enough for delicate instrument work without damaging soft brass or bone.
How do I maintain my feeler gauge set to ensure accuracy?
Wipe blades clean after each use to prevent oil buildup. Store in the holder with the thumb screw lightly tightened. Avoid dropping or bending blades. Periodically check a few blades with a micrometer—if they show wear, replace the entire set for consistency.
Are stainless steel feeler gauges worth the extra cost over carbon steel?
For garage environments, absolutely. Stainless resists rust from humidity and chemical exposure that can swell carbon steel blades, throwing off measurements. Carbon steel works fine for climate-controlled indoor use but requires oiling to prevent corrosion.
What's the best starter set for a DIYer on a budget?
The TUSK 32-blade tapered set provides essential range and accuracy at a budget price. It handles spark plugs, basic valve checks, and household tasks. Upgrade to a two-piece straight/angled kit later if you tackle more complex automotive work regularly.
