From 12I to 40I: A Complete Guide to YuZuan Thread Milling Inserts Selection

In modern manufacturing, thread quality and efficiency directly impact part performance and production costs. However, engineers often face challenges such as:

- Unstable thread accuracy  

- Short tool life and frequent replacements  

- Multiple tools required for different thread sizes  

Compared to traditional tapping, thread milling has become a more flexible and efficient solution. Choosing the right insert series is key to achieving optimal performance.

This article provides a complete overview of YuZuan thread milling insert series (12I, 14I, 21I, 30I, 40I) and practical selection guidelines.

[What is Thread Milling?]

Thread milling is a process that uses a rotating tool with interpolation movement to produce threads. Compared with tapping, it offers several advantages:

- One tool for multiple thread diameters  

- Lower risk of tool breakage  

- Ideal for difficult materials (stainless steel, titanium)  

- Better surface finish and process stability  

[YuZuan Insert Series Overview]

12I: Small threads, high precision  

14I: Small to medium threads, versatile  

21I: Medium threads, strong stability  

30I: Large threads, high efficiency  

40I: Extra-large threads, heavy-duty cutting  

[Series Breakdown]

12I Series: Designed for small threads in precision industries such as medical and electronics. High accuracy and suitable for small holes.

14I Series: Versatile and cost-effective, ideal for general applications and batch production.

21I Series: The most widely used series, offering higher rigidity and stability. Suitable for automotive and machinery industries.

30I Series: Designed for large thread diameters, improving machining efficiency.

40I Series: Built for heavy-duty and extreme conditions, widely used in energy and heavy equipment industries.

[How to Select the Right Insert]

- Small threads → 12I  

- General applications → 14I / 21I  

- Large threads → 30I / 40I  

Also consider material type and machining conditions.

[Conclusion]

Thread milling is becoming the preferred solution in modern manufacturing. Choosing the right insert is critical. YuZuan offers complete solutions to meet diverse machining needs.