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The saw thread is a specialist among thread types
The variety of thread types is vast, and you may have noticed this when you needed something more than a simple screw. Each type of thread has been specifically designed for a particular function, and while they all serve the same basic purpose, their unique characteristics make them suitable for different applications. However, one type stands out from the rest — the **saw thread**. Unlike traditional threads, it looks quite unusual at first glance, but its design gives it some remarkable properties that make it ideal for specific tasks.
So, what makes the saw thread special? Let’s dive into its unique features and understand why it’s used in various industries.
### The Unique Profile of the Saw Thread
One of the most distinctive traits of the saw thread is its **asymmetrical profile**, which resembles the teeth of a saw. This is where it gets its name, even though it doesn’t actually cut or relate to actual saws. The asymmetry means that the two flanks of the thread are not equal in angle — one side is much steeper than the other.
This asymmetry is intentional. The saw thread is designed to handle **unidirectional loads**, meaning it can bear heavy forces in one direction but not the other. That’s why there are two types of flanks: the **load-bearing flank** and the **non-load-bearing flank**. The load-bearing side is almost perpendicular to the axis, allowing it to generate significant axial force, making it perfect for moving loads in one direction.
### How Saw Threads Work Under Load
Because of its unique shape, the saw thread is especially effective in situations where **force is applied in a single direction**. For example, in lifting mechanisms or clamping devices, the saw thread ensures that the load stays in place without slipping back. This makes it an excellent choice for **screw jacks, vices, and even dental implants**, where stability is key.
In the oil and gas industry, saw threads are also used to create **secure and sealed connections**, as the unidirectional force helps maintain a tight seal under pressure.
### Different Types of Saw Threads
There are several variations of the saw thread, each suited for different purposes:
- **Metric Saw Thread (German Saw Thread)**: Known internationally as the "German saw thread," it has a flank angle of 3° on the load-bearing side and 30° on the non-load-bearing side, totaling 33°. It's standardized under DIN 513-1 to 513-3 and marked with the letter **S**.
- **45° Flank Angle**: Common in many countries, including the U.S. and the UK, this version has a 45° angle on the non-load-bearing flank. Some versions add a 7° angle on the load-bearing side for better performance.
- **Saw Thread for Plastic Containers**: Specifically designed for use in packaging, this thread has a higher angle of 10° on the load-bearing side and 40° on the other. It follows standards like **DIN 6063-1** and is marked **KS**.
### Tools for Working with Saw Threads
Since saw threads are unique, they require special tools for installation and maintenance. Whether you're tapping, threading, or adjusting, having the right equipment is essential. You can find high-quality taps and tools for saw threads in our **BAER online store**. We offer a wide range of threading tools and accessories to make your work easier and more efficient. If you need help, our customer service team is always here to assist you.