Mũi taro máy DIN 371 Form B HSSE - BSW 1/2 x 12

The abbreviation BSW stands for "British Standard Whitworth," a historical but still important thread standard in many areas. In contrast to metric threads, the Whitworth thread has a flank angle of 55 degrees and rounded thread crests and roots. The measurements are specified in inches, not millimeters.

You will frequently encounter BSW threads on older machinery, in agriculture, in plant engineering, and on British vehicles, where high resistance to vibration and a robust connection are required.

The designation "Form B" is crucial for the application of this tap. Form B is characterized by a chamfer with a special spiral point, also known as a "spiral lead."

This wedge-shaped profile pushes the chips forward in the cutting direction in a controlled manner.

For you, this means: In a through hole, the chips are reliably pushed out of the hole without getting jammed in the thread. This prevents chip build-up, reduces the risk of tap breakage, and ensures high thread quality.

The DIN 371 is a German industrial standard that specifies the dimensions and tolerances for machine taps with a reinforced shank.

Although this tool cuts a Whitworth thread, its design is based on the specifications of DIN 371. This guarantees that the tap has a reinforced shank that reduces vibrations, increases stability, and makes it very resistant even under higher loads.

• Thread Type: Whitworth thread BSW (according to BS 84)
• Nominal size: BSW 1/2 x 12
• Material: HSS-E
• Form: Form B
• Overall Length (L1): 110 mm
• Thread Length (L2): 25 mm
• Shank Diameter (D2): 12 mm
• Drive Square: 9 mm

1. What is the difference between a Whitworth (BSW) and a metric (M) thread?

The main difference lies in the angle and the measurement system. A BSW thread has a flank angle of 55° and is measured in inches (e.g., 1/2 inch), while a metric thread has a flank angle of 60° and is measured in millimeters (e.g., M10).

2. What does the "1/2 x 12" in the name mean?

The "1/2" stands for the outer diameter of the thread in inches (approx. 12.7 mm), and the "12" indicates the number of threads per inch (tpi).

3. Why is this tool better suited for lỗ thông than for lỗ bít?

The Form B of this tap is equipped with a special spiral point that pushes the chips forward. In a through hole, the chips can easily exit. In a blind hole, this would lead to a chip jam at the bottom of the thread and cause the tool to break.

4. What does the material HSS-E stand for?

HSS-E stands for "High Speed thép with Cobalt." It is a high-quality high-speed thép with a cobalt content that makes the tool harder, more resistant to high temperatures, and more wear-resistant than conventional HSS thép.

5. Can I also use this tool manually?

Yes, the square drive (9 mm) also allows for use in an Tay quay taro điều chỉnh. However, the tool is primarily designed for machine use, where you can achieve higher speeds and a more consistent feed rate.