The saw thread is a specialist among thread types
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The world of threads is vast and varied, with countless types designed for specific purposes. While most threads follow standard profiles, there's one that stands out for its unique design: the **saw thread**. At first glance, it might not look like a traditional thread, but its special geometry gives it distinct advantages in certain applications.
Saw threads are unlike other common thread types such as metric, trapezoidal, or square threads. Their profile resembles the teeth of a saw, which is where the name comes from—though they have nothing to do with actual sawing. What makes them unique is their **asymmetrical shape**, with two different angles on each side of the thread. This asymmetry allows them to handle **unidirectional loads** more effectively than symmetrical threads.
One of the key features of a saw thread is the distinction between the **load-bearing flank** and the **non-load-bearing flank**. The load-bearing side is almost perpendicular to the axis, allowing it to generate strong axial force and support heavy loads. The non-load-bearing side has a much shallower angle, reducing friction and wear when the thread moves in the opposite direction.
This design makes saw threads ideal for applications where force is applied in only one direction. They are commonly used in **lifting screws, screw presses, and clamping devices**. For example, vices often use saw threads to create a secure grip, while dental implants and oil industry connections rely on their ability to maintain a tight, sealed connection under unidirectional pressure.
There are several types of saw threads available, each suited for different uses. The **metric saw thread**, also known as the "German saw thread," is the most widely used. It has a flank angle of 33°, with 3° on the load-bearing side and 30° on the non-load-bearing side. It is standardized under DIN 513-1 to DIN 513-3 and marked with the letter **S**.
Another common variant is the **45° saw thread**, which has a perpendicular load-bearing flank and a 45° non-load-bearing flank. There’s also an **American ANSI saw thread** with a 7° angle on the load-bearing side and 45° on the other. In the UK, similar standards exist, showing the global relevance of this thread type.
For specialized applications, such as **plastic containers in the packaging industry**, a unique saw thread exists with a higher angle on the load-bearing side. This version is standardized under **DIN 6063-1** and marked with **KS**. A separate standard, **DIN 6063-2**, covers trapezoidal threads for plastic containers, so it's important to distinguish between them.
If you're looking for tools to work with saw threads, you’ll need a **specialized tap**. You can find high-quality taps and threading tools at our **BAER online store**. Whether you're working on industrial machinery, medical devices, or custom projects, we have the right tools to make your job easier. If you have any questions or need assistance, our customer service team is here to help. Explore our full range today and see how we can support your next project.