Machine Tap ISO 529 Form B HSS-G - BSF 1" x 10

The abbreviation BSF stands for "British Standard Fine." As the name suggests, it is a fine thread. The big difference from the more well-known BSW thread (British Standard Whitworth) lies in the pitch.

• BSW thread is a standard (coarse) thread and has a larger pitch for a given diameter (fewer threads per inch). It is often used for robust connections where strength is the priority.
• BSF thread is a fine thread and has a significantly finer pitch for the same diameter (more threads per inch). This leads to a higher resistance to vibrations, a finer adjustment, and a better sealing effect, which is why it is frequently used in the automotive industry, precision mechanical engineering, and for thin-walled materials.

Both threads have the same flank angle of 55°, which distinguishes them from the metric system (60°).

The designation "Form B" provides information about the tap's chamfer form. Form B has a short spiral point chamfer (approx. 3.5 to 5 threads) and is ideal for cutting threads in through holes.

The wedge-shaped profile at the cutting edge reliably pushes the chips forward, out of the hole.

For you, this means: In through holes, the chips can be transported away without obstruction, which prevents chip jams and minimizes the risk of tool breakage.

ISO 529 is an international standard that specifies the dimensions and tolerances of hand taps for machine applications.

For you, this means that this tap is manufactured according to globally recognized standards. This standard guarantees that the tap has accurate dimensions, ensuring optimal compatibility and high process reliability, whether you use it manually with a tap wrench or in a machine.

• Thread Type: British Standard Fine thread BSF (according to BS 84)
• Standard: ISO 529
• Nominal Size: BSF 1" x 10
• Material: HSS-G
• Form: Form B
• Application: Manual and machine use for through holes
• Overall Length (L1): 120 mm
• Thread Length (L2): 35 mm
• Shank Diameter (D2): 18 mm
• Drive Square: 14 mm

1. What is the main difference between BSF and BSW?

The main difference is the thread pitch. BSF is a fine thread with a higher number of threads per inch for the same diameter, while BSW is a coarse thread with fewer threads.

2. Can I use this tap for both manual and machine applications?

Yes, thanks to its construction according to ISO 529 and the robust HSS-G material, this tap is designed for both types of use. The square drive is suitable for use with a tap wrench, but the design also allows for use in a machine.

3. What does "1" x 10" in the nominal size mean?

The "1"" stands for the outer diameter of 1 inch, and the "10" indicates the number of threads per inch (tpi).

4. What does the material HSS-G mean?

HSS-G stands for "High Speed Steel - Ground." The "G" means that the cutting surfaces and thread profiles are precision ground. This leads to higher cutting accuracy, better surface quality of the threads cut, and an increased tool life.

5. Why is a Form B tap ideal for through holes?

Form B has a special spiral point chamfer that pushes the chips generated during cutting forward, out of the hole. This is an advantage in through holes because the chips can exit unhindered and do not get jammed in the workpiece.