Machine Tap DIN 371 Form B HSSE left hand thread - BSW 1/8 x 40 LH

• Support maintenance in mechanical engineering, plant engineering, and metal fabrication when replacement parts must match existing fasteners.
• Cut internal threads in drilled holes for new production and repair work.
• Select the tool by matching the thread system and series from the designation to the mating screw or drawing requirement.
• Use a suitable tap holder or tap wrench to keep the tool aligned and to avoid side load.
• Process: manual driving or assisted driving depending on your holder and machine setup.
• Use: thread cutting, re tapping, and thread cleaning depending on condition.

Note Use cutting fluid suitable for the work material and keep the tool square to the hole axis.

• Clear thread designation supports correct selection and documentation.
• Tool geometry terms in the name support consistent process planning.
• Suitable for workshop use when hole preparation and alignment are controlled.
• Material abbreviation in the name supports expectations for heat resistance tendency and wear behavior.
• Standard references help you align shop language with drawings and work instructions.

• Not intended for brittle materials without an adapted tapping strategy and adequate lubrication.
• Not suitable for high performance production without rigid alignment and controlled coolant supply.

1. Confirm that the designation matches the required thread system and the intended hand or machine use.
2. Prepare the hole with the correct core hole drill and a clean chamfer.
3. Mount the tool in a suitable holder and align it to the hole axis.
4. Apply cutting fluid that matches the work material and process.
5. Start the cut with steady feed and keep alignment constant.
6. Periodically reverse slightly to clear chips and reduce torque.
7. Continue to the required thread depth, then back the tool out fully.

• 1 piece Machine Tap DIN 371 Form B HSSE left hand thread - BSW 1/8 x 40 LH

• Product type: Machine tap
• Standard: DIN 371
• Chamfer form: Form B
• Thread direction: Left hand
• Thread system: BSW
• Material marking: HSSE

How do you confirm that the tool matches the required thread

Match the complete designation to the drawing or the mating screw, including thread system, series, and direction. Avoid mixing similar looking inch and metric systems during preparation.

When do you choose a machine tap

Choose a machine tap when the process is driven by a machine or a guided holder that keeps feed and alignment consistent. For manual work, a hand tap or a hand tap set can be the better choice.

How do form letters and flute terms affect your selection

Form B describes the chamfer style and influences how the tool starts and how deep you can thread before full profile is reached.

How do you prepare the hole before tapping

Drill the correct core hole, remove burrs, and add a small chamfer to support clean thread entry. Clean the hole and apply cutting fluid suitable for the work material before you start.

Where can you find detailed technical notes for this tool type

Technical information machine taps as PDF

How do you reduce the risk of tool breakage

Keep the tool aligned, use adequate lubrication, and avoid side load during entry. Clear chips regularly and stop if torque rises unexpectedly.

Where can you find catalog information for this threading tool

VD 23 catalog as PDF

What do material abbreviations such as HSS or HSSE indicate

HSSE indicates a cobalt alloyed high speed steel grade that can improve hot hardness tendency in demanding materials.