Corner Radius Guide: Making Perfect Sign Corners

In the world of sign making and metal work, the corner radius is a very important detail. Whether you are following the latest road safety rules (MUTCD 11th Edition) or making custom metal boxes, the way you round your corners affects how safe and professional the final product looks.

No "Armstrong" Needed: Work Smarter

Many old-fashioned tools require "Armstrong" power—meaning you have to use your own muscle and body weight to force the punch through the metal. This wears out your back and slows down your shop.

Our tools are designed to be Easy-Punch. They do the heavy lifting for you, allowing you to punch through thick 1/8" aluminum with very little effort. Save your energy for the rest of the job and let the tool do the hard work.

MUTCD Corner Radius

A "radius" is just a way to measure a curve. A 3-inch radius makes a bigger, rounder curve than a 1.5-inch radius. Our 4-Way Die lets you switch between these four common sizes in seconds:

Watch the Tool in Action

See how easy it is to get a perfect corner every time with no struggle and no muscle strain.

Stay Legal with Perfect Corners

The latest road rules are very strict about corner sizes. Using a real corner rounder tool ensures that every sign you make is exactly the same. Our tools are made in Canada to last a long time, even in busy shops that make hundreds of signs a day.