Metric Die Sizes- 16 mm Die: Used for smaller threads, such as those found in precision parts or small machinery components. 20 mm Die: Common for medium-sized threads, suitable for a range of applications from fasteners to mechanical parts. 25 mm Die: Generally used for larger threads that require more strength and durability. 30 mm Die: For even larger threads, often used in heavy-duty applications or larger machinery. 38 mm Die: This size is used for the largest threads, which might be needed for substantial structural components or industrial machinery. 2. Holder Capacity- The lathe's die holder must be compatible with the sizes of dies you are using. Each die holder is designed to securely hold a specific range of die sizes. Here's how to choose and use die holders based on the capacity: Die Holder Design:- Ensure the die holder can accommodate the specific die size you're using. Some holders are adjustable or come with different inserts to fit various die sizes. Capacity Specifications: Check the lathe's specifications to determine which die holders are compatible. For instance, a lathe might come with standard holders for common die sizes or offer optional holders for larger or smaller dies. Installation and Adjustment:- Install the die in the holder correctly and make sure it's secured. Adjust the die holder to fit snugly, ensuring that the threading process is accurate and smooth. 3. Practical Considerations- Threading Pitch:- Besides die size, consider the pitch of the thread you need. Different dies will have different pitches, so choose the die that matches the thread pitch requirement for your project. Material and Hardness: Ensure that the die and die holder are made of materials that can handle the hardness of the workpiece. Some materials may require specialized dies or holders. Lathe Setup:- Properly set up the lathe, including speed and feed settings, to match the threading requirements. This will help achieve a clean and precise thread.