{"id":2902,"date":"2026-06-06T22:00:23","date_gmt":"2026-06-06T14:00:23","guid":{"rendered":"http:\/\/www.ziubinski.com\/blog\/?p=2902"},"modified":"2026-06-06T22:00:23","modified_gmt":"2026-06-06T14:00:23","slug":"what-is-the-difference-between-a-square-end-and-a-corner-radius-flat-end-mill-4086-753c16","status":"publish","type":"post","link":"http:\/\/www.ziubinski.com\/blog\/2026\/06\/06\/what-is-the-difference-between-a-square-end-and-a-corner-radius-flat-end-mill-4086-753c16\/","title":{"rendered":"What is the difference between a square – end and a corner – radius flat end mill?"},"content":{"rendered":"

Hey there! As a supplier of flat end mills, I often get asked about the difference between square – end and corner – radius flat end mills. Let’s dive right in and break it down. Flat End Mill<\/a><\/p>\n

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What are Flat End Mills?<\/h3>\n

First off, let’s quickly go over what flat end mills are. Flat end mills are cutting tools used in machining operations, like milling, to shape and cut materials such as metal, wood, and plastic. They come in different shapes and sizes, and two of the most common types are square – end and corner – radius flat end mills.<\/p>\n

Square – End Flat End Mills<\/h3>\n

Square – end flat end mills, as the name suggests, have a square cutting edge at the end. This design allows for very precise and sharp cuts. When you need to create 90 – degree corners or flat bottoms in your workpiece, square – end mills are the way to go.<\/p>\n

One of the biggest advantages of square – end mills is their ability to produce sharp internal corners. For example, if you’re making a part with a square cavity, a square – end mill can cut that cavity with a clean, sharp corner. This is crucial in applications where precision is key, like in the aerospace or medical device industries.<\/p>\n

However, square – end mills do have their drawbacks. The sharp corners can be prone to chipping, especially when cutting hard materials. This is because the stress is concentrated at the corners, which can cause the tool to break under high loads. Also, when you’re doing contouring operations, the sharp corners can leave small ridges or burrs on the surface of the workpiece.<\/p>\n

Corner – Radius Flat End Mills<\/h3>\n

Corner – radius flat end mills, on the other hand, have a rounded corner at the end of the cutting edge. This radius can range from a very small value to a relatively large one, depending on the specific application.<\/p>\n

The main advantage of corner – radius flat end mills is their durability. The rounded corners distribute the cutting forces more evenly across the tool, reducing the stress concentration. This means that they are less likely to chip or break compared to square – end mills, especially when cutting hard or tough materials.<\/p>\n

Another benefit is the surface finish. When you use a corner – radius flat end mill for contouring operations, it can produce a smoother surface finish compared to a square – end mill. The rounded corner helps to blend the cuts more smoothly, reducing the appearance of ridges and burrs.<\/p>\n

But corner – radius flat end mills also have limitations. They can’t create sharp 90 – degree corners. If your project requires sharp internal corners, a corner – radius mill won’t be the best choice.<\/p>\n

Applications<\/h3>\n

Let’s talk about where these two types of end mills are commonly used.<\/p>\n

Square – End Flat End Mills<\/h4>\n