Short Machine Tap with interrupted threads DIN 352 Form B HSSE - M 5 x 0.8

Short Machine Tap: Unlike a 3-piece set that consists of a taper, plug, and bottoming tap, a short machine tap cuts the thread in a single operation. This saves time and is particularly efficient for through holes where a full thread length is not required. The tap is designed to combine the functions of all three taps into one.

Interrupted Threads: In this special design, the cutting teeth are not arranged in a continuous spiral but have gaps. This offers several advantages: chips can be removed more easily, friction and thus heat generation are reduced, and the cutting torque decreases, which reduces the load on the tap and the machine.

DIN 352: This standard specifies the exact requirements for hand taps, including dimensions, tolerances, and the design of the cutting edges. Compliance with DIN 352 ensures that the tool is of high precision and quality.

Form B (4-5 Thread Chamfer): Form B describes the shape of the tap's chamfer, which is the front part of the tap. For Form B, 4 to 5 threads are ground, which means a shorter chamfer than a taper tap (Form A). This makes it universally applicable for both through holes and blind holes, although it is most effective with through holes.

HSSE (High-Speed Steel with Cobalt): This material is an improved version of HSS steel. The addition of cobalt increases its hot hardness, which means the tap retains its cutting performance even at higher temperatures, such as those that occur during machine use. This makes it particularly durable and wear-resistant.

Follow these steps to cut a thread precisely:

1. Preparation: Ensure the workpiece is securely clamped and drill a core hole with the correct diameter for an M 5 x 0.8 thread.
2. Tool Clamping: Clamp the short machine tap into a tap wrench for manual operation or a drill chuck for machine use.
3. Starting the Tap: Place the tap vertically and straight into the bore. Start turning the tap slowly and evenly clockwise.
4. Lubrication: Apply cutting oil or a suitable lubricant to the tap and the workpiece to minimize friction and extend the tool's life.
5. Thread Cutting: Continue turning the tap until the desired thread depth is reached. When using a machine, pay attention to the correct speed.
6. Cleaning and Inspection: Clean the finished thread of any chips and check the quality with a thread gauge.

1. When should I use a short machine tap instead of a set?

You should use a short machine tap when you need to cut a thread quickly in a single pass. It is particularly efficient for through holes in softer materials.

2. What does the designation M 5 x 0.8 mean?

M stands for the metric ISO thread. The number 5 indicates the nominal diameter in millimeters, and 0.8 is the thread pitch, which is the distance between two threads in millimeters.

3. Can I also use this tap for blind holes?

Yes, thanks to Form B, this tap is also suitable for blind holes. It cuts the thread almost to the bottom of the hole. For a perfect thread depth, you should consider a suitable blind hole tap model.

4. What is the advantage of HSSE over HSS?

The cobalt content in HSSE steel increases its heat resistance and hardness. This makes the tap more resistant to wear, especially at higher cutting speeds or when machining harder materials.

5. How do I choose the right speed for machine use?

The optimal speed depends on the material. As a rule of thumb: the harder the material, the lower the speed. Always use the material manufacturer's recommendations or a thread tap chart to achieve optimal results and protect the tool.