When it comes to CNC turning, choosing the right insert makes the difference between smooth machining and constant frustration. Two common insert types you’ll encounter are CCGT and CCMT inserts. While they look similar, their performance and ideal applications are quite different. Let’s break down the key differences so you can make the right choice for your work.
Both CCGT and CCMT inserts share the “CC” designation, meaning they have an 80° diamond shape with a clearance angle of 7°. But from there, their purposes diverge.
CCGT – Ground and polished inserts, designed for finishing non-ferrous and soft materials.
CCMT – More general-purpose inserts, with molded chipbreakers suitable for steel and harder alloys.
| Feature | CCGT Insert | CCMT Insert |
|---|---|---|
| Edge Type | Sharp, polished cutting edge | Stronger, molded edge |
| Best For | Aluminum, copper, brass, plastics, stainless | Carbon steel, alloy steel, cast iron |
| Cutting Style | Light cutting, finishing, low cutting force | Medium to heavy cutting, roughing and finishing |
| Surface Finish | Excellent mirror-like surface quality | Good finish, but not as fine as CCGT |
| Durability | Edge wears faster on hard materials | More robust edge, longer life in steels |
| User Level | Ideal for beginners and precision machining | Preferred for industrial, heavy-duty work |
If your priority is surface finish on aluminum parts, CCGT is the better choice.
If you need a versatile insert that handles steels and cast iron, CCMT is the way to go.
Many machinists keep both types in their toolbox to switch depending on the job.
Automotive industry – CCGT inserts are used for finishing lightweight aluminum engine components.
General engineering – CCMT inserts handle steel shafts and cast iron housings efficiently.
Prototype machining – Beginners often start with CCGT because it reduces chatter and makes machining smoother.Explore our Carbide CCGT Turning Inserts for steel and cast iron machining.
Don’t use CCGT on heavy interrupted cuts—it may chip.
Choose CCMT for tougher jobs where tool life matters more than finish.
Match the right insert with the right tool holder for maximum performance.
While CCGT and CCMT inserts share a similar look, they are optimized for different machining needs. CCGT excels in delivering a superior finish on softer materials, while CCMT provides durability and versatility for tougher metals. Knowing these differences ensures better tool selection, improved efficiency, and cost savings in your CNC operations.
Contact our experts today for a free quote or technical consultation.