02
2025
-
12
How to Choose CNC Threading Inserts? A Complete Guide to Classification and Practical Tips
How to Choose CNC Threading Inserts? A Complete Guide to Classification and Practical Tips
In CNC machining workshops, it's common to hear operators complain: "This thread insert keeps chipping"or"The precision never meets requirements". More often than not, the root cause lies in choosing the wrong threading insert. As the core tool for thread machining in CNC turning, threading inserts have a seemingly complex classification system—but it follows clear logic. Today, we' ll break down classification dimensions, selection tips, and common pitfalls to help you master insert selection effortlessly.
Master the Core Classification Dimensions of Threading Inserts
Threading insert classification isn’t one-size-fits-all; it must align with machining needs from multiple perspectives. The four most practical categories are:
By Thread Standard: The Foundation of"Universal Language"
This is the most critical classification, as thread standards vary drastically across industries and countries—choosing the wrong one means the insert won't match the workpiece.
Metric Threads (M-Series): The most widely used type in daily machining (e.g.,"M8×1.25" on common screws) with a 60° thread angle. Ideal for civil fields like machinery, electronics, and automotive manufacturing. Inserts are typically marked with "M" (e.g., 16IR M10 ISO) .
Imperial Threads (UNC/UNF): Dominant in Anglo-American systems, distinguished by threads per inch (TPI). For example, 1/4-20 UNC (1/4-inch diameter, 20 threads per inch) suits heavy-load connections, while 1/4-28 UNF offers better sealing and vibration resistance for precision equipment .
Pipe Threads (G/NPT): Designed exclusively for pipe connections, split into non-sealing and sealing types. G1/2 (55° non-sealing) relies on gaskets, while NPT1/2 (60° sealing) uses thread engagement—both critical for hydraulic and pneumatic systems .
Trapezoidal Threads (Tr): Featuring a 30° trapezoidal profile for high load-bearing capacity. Used in power transmission components like machine tool leadscrews and jack screws, requiring inserts with enhanced cutting edge strength .
Pro Tip: Check the thread marking on your blueprint first (e.g., M, G, Tr prefixes) to directly match the insert standard—avoid “cross-standard selection".
If you are looking for thread insert, please feel free to contact Jinxin for professional customized support.
