MITUTOYO

RADIUS GAGES

The Simple Way to Measure Perfect Profiles

Machining flat surfaces requires accurate calipers, but checking rounded corners demands a different approach entirely. Inspecting a curved profile by eye leads to defective parts and wasted material. High-quality radius gages solve this problem instantly. They provide a fast, foolproof way to check both internal and external curves.

What are Radius Gages?

Radius gages are precision leaf-style measuring tools. Manufacturers stamp each metal leaf with a highly accurate, pre-measured radius.

Inspection teams use them to check the curvature of tool edges, mold corners, and machined fillets. They work on a simple pass/fail system. You match the gage profile to your workpiece until you see zero light passing through the seam.

Key Features of a Premium Gage Set

A standard industrial set offers several unique design benefits for your shop:

  • Dual-Ended Leaves: Each leaf measures internal radii on one end and external radii on the other.

  • Locking Nut Design: A central screw allows you to select a single leaf or lock it firmly into position.

  • Corrosion Resistance: Satin-chrome stainless steel finishes prevent rust from handling and humidity.

  • Clear Markings: Laser-etched fractions or decimals make selecting sizes incredibly fast.

How to Achieve Perfect Inspections

Inspection Tip: Always wipe your workpiece clean before checking the profile. Tiny metal burrs or heavy grease layers mimic a bad radius reading.

Place the selected leaf directly against the curved edge of your part. Look toward a bright light source behind the tool. If you see light bleeding through the center or edges, the radius is incorrect.

Stop guessing on your rounding and contouring work. Invest in a durable set of radius gages today to keep your production flawlessly accurate.

Radius size is stamp on each gage leaf Each leaf comprise an internal and external radius gage of the same size