Round Die DIN 223 (DIN EN 22568) HSS - M 72 x 2.0

The meaning of the product designation:

• Round Die: A tool for cutting external threads. You clamp it in a die stock and turn it onto your workpiece.
• M 72 x 2.0: This is the exact thread size. "M" stands for metric ISO thread. "72" is the nominal diameter in millimeters. "2.0" is the pitch (the distance between the threads) in millimeters. For such a large diameter, 2.0 mm is a fine pitch, which ensures higher load-bearing capacity and vibration resistance.
• HSS-G: The material designation stands for "High-Speed Steel, ground." HSS is a high-alloy high-speed steel known for its hardness and heat resistance. The "G" addition means that the die has been precision-ground after manufacturing. This ensures a sharper cutting edge, better chip removal, and a significantly longer tool life.

The standards DIN 223, DIN EN 22568 & DIN 13:

• DIN 223: This was the original German standard for round dies, which has now been superseded by the European standard DIN EN 22568. Compliance with these standards guarantees the dimensions, shape, and tolerance of the tool.
• DIN EN 22568: The current European standard that ensures the die conforms to modern manufacturing standards and offers high precision.
• DIN 13: This standard regulates the basic dimensions and profiles of metric ISO threads. The designation "M 72 x 2.0" refers directly to this standard and defines the exact profile and tolerances of the thread to be cut.

Cutting an external thread requires careful preparation and a steady hand. Follow these steps to achieve a precise result:

1. Prepare your workpiece: The round rod or bolt on which the thread is to be cut must have the exact nominal diameter (72 mm). Chamfer the end of the workpiece with a small bevel. This makes it easier to set the die.
2. Clamp your tool: Securely clamp the die in a suitable die stock. With a die of this size, a stable holder is crucial.
3. Lubrication: Before you start the cutting process, you must generously lubricate your workpiece and the die with cutting oil. This reduces friction, extends the tool's life, and ensures a clean thread surface.
4. Setting and Cutting: Place the die perpendicularly to the bolt axis. With light, even pressure, you begin to turn the die stock clockwise. Pay attention to a straight guide to avoid an "egg-shaped" thread.
5. Conclusion and cleaning: Once the thread has been cut to the desired length, carefully turn the die off the bolt. Clean the finished thread and the tool from chips and cutting oil. Check the result with a thread ring gauge.

1. What is the difference between a fine thread and a coarse thread?
Coarse threads are the standard threads with a larger pitch, which are used for most screw connections. Fine threads, such as the M 72 x 2.0, have a smaller pitch. This results in a larger load-bearing thread surface, which increases load capacity and better protects the thread from self-loosening.

2. What does the designation "HSS-G" mean?
HSS-G stands for "High-Speed Steel, ground." This means that the tool is made of hardened high-speed steel and the cutting profiles have been ground after heat treatment. Grinding ensures higher precision, sharper edges, and longer durability compared to stamped tools.

3. Why is compliance with DIN and ISO standards important?
Standards like DIN EN 22568 and DIN 13 guarantee compatibility. They ensure that the thread cut with this die will fit exactly to a nut or an internal thread with the same standard and dimensions. This is essential for the functionality and safety of the connection.

4. Can I use this die for every material?
According to the manufacturer, the die is suitable for machinable materials up to 800 N/mm² as well as for unalloyed and low-alloy steels. For harder or tougher materials (e.g., stainless steel), special tools with appropriate coatings or made from higher-quality steel grades (e.g., HSSE-Co5) should be used.

5. How do I properly care for the die?
After each use, you should carefully clean the die of chips and dirt. Store it in a dry, lightly oiled place to protect it from rust. Proper use and regular lubrication during the cutting process significantly extend the service life.