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The variety of thread types is vast, and it's easy to see why when you need something more complex than a simple fastener. Each type of thread was developed for a specific purpose, and while they all function in similar ways, their unique designs allow them to perform tasks that others can't do as effectively. One exception to the norm is the **saw thread**, which stands out not just for its unusual shape, but also for its specialized applications.
So what makes the saw thread so different? The name itself comes from its profile, which resembles the teeth of a saw. However, despite the name, it has nothing to do with cutting or sawing. Instead, the saw thread is designed to handle **unidirectional loads** efficiently, making it ideal for certain mechanical applications.
One of the most notable features of the saw thread is that its profile is **asymmetrical**. Unlike most other threads, such as V-shaped, round, or trapezoidal threads, the two flanks of a saw thread are not equal. This asymmetry creates a **load-bearing flank** and a **non-load-bearing flank**, each with different angles. In the case of the metric saw thread, the load-bearing side has an angle of 3°, while the non-load-bearing side has an angle of 30°, resulting in a total flank angle of 33°. This design allows the thread to transmit force in one direction very effectively.
Because of this one-sided strength, saw threads are often used in applications where **force is applied in a single axial direction**. Common uses include **lifting spindles**, **screw presses**, and **clamping mechanisms** like those found in vices. They’re also used in **dental implants** and **oil industry connections**, where the unidirectional force helps create secure and tight seals.
There are several types of saw threads available, each suited for different purposes:
- **Metric saw thread (also known as the German saw thread)**: This is the most commonly used type in many countries. It has a flank angle of 33°, with 3° on the load-bearing side and 30° on the non-load-bearing side. It’s standardized under DIN 513-1 to DIN 513-3 and is marked with the letter "S."
- **45° saw thread**: This version is popular in some regions, especially in the U.S. and the UK. It typically has a 45° angle on the non-load-bearing flank, with the load-bearing side being perpendicular to the axis. Some variations include a slight angle on the load-bearing side for added versatility.
- **Saw thread for plastic containers**: Designed specifically for use in packaging, this variant has a higher angle on the load-bearing flank (10°) and a 40° angle on the non-load-bearing side. It follows the standard DIN 6063-1 and is marked with "KS." There's also a separate standard for trapezoidal threads in plastic containers (DIN 6063-2), so it's important to distinguish between the two.
If you're looking to work with saw threads, you'll need the right tools. A special **tap** is required for tapping these unique threads, and you can find high-quality options in our **BAER online store**. Whether you're working on industrial machinery, medical devices, or packaging equipment, we have the tools and accessories to make your job easier. If you have any questions, our customer service team is always here to help.