Fluteless Machine Tap without oil groove DIN 371 Form C HSSE - M 8 x 1.25

• Forming of internal threads in ductile materials where chip free processing is preferred
• Use in production and maintenance when thread flank quality and repeatability are required
• Suitable for through holes and blind holes when the correct geometry is selected from the product name
• Use with a tapping chuck or suitable collet holder to keep axial alignment during the tapping cycle
• 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 If the thread is safety relevant, you also check thread quality with an appropriate gauge after machining.

• Stable thread profile when alignment and pre hole preparation are controlled
• Chip free process can reduce cleaning effort in certain materials
• Good thread surface due to forming action when material ductility is sufficient
• Often improved tool life when lubrication and material are suitable

• Requires ductile workpiece materials and correct pre hole preparation to avoid excessive torque
• Not suitable for high performance applications when process limits are not controlled

1. Confirm the thread designation, standard, and execution in the product name against your drawing and material specification.
2. Prepare the pre hole and entry chamfer according to your process specification and remove burrs from the opening.
3. Clamp the tap in a tapping chuck or suitable collet holder and set up the cycle so feed stays synchronised with rotation.
4. Apply a suitable cutting lubricant or coolant for the workpiece material and ensure the entry area is wet.
5. Start the cut with the tool aligned to the hole axis and keep the alignment stable through the first turns or revolutions.
6. Run the forming pass with steady feed and stop the process if torque rises sharply due to insufficient lubrication or material suitability.
7. Retract the tool, clean chips from the flutes, and inspect the thread before the part moves to the next operation.

Scope of supply is not specified in the provided data.

• Type: Fluteless machine tap
• Standard: DIN 371
• Thread system: ISO metric
• Execution: Form C
• Tool material: HSS
• Lubricant groove: Without oil groove
• Tolerance class: ISO metric internal thread tolerance 6H

How do you choose the correct variant for your thread and workpiece?

You match the thread designation, standard, and geometry in the product name to your drawing and hole type. You also consider the workpiece material and whether the hole is through or blind, because these factors influence chip transport and torque.

Which holder type do you typically use with this tap?

You typically use a tapping chuck or a suitable collet holder so the tap runs concentrically and stays aligned. If your process needs axial compensation, you choose a holder that provides it.

How do you reduce the risk of broken taps and damaged threads?

You keep the tool aligned, use a suitable lubricant, and monitor torque so you can stop before overload. You also remove chips from the flutes and avoid starting on burrs or hard scale.

Where can you read more about fluteless tapping requirements?

Use the PDF for consolidated notes on selection and handling. Technical information fluteless machine taps as PDF

Do you need cutting lubricant or coolant for this tap?

Yes, you use a lubricant or coolant matched to the workpiece material to reduce friction and to control heat. Stable lubrication also helps keep thread flank quality consistent.

How do you maintain and store the tap after use?

You clean chips from the flutes, dry the tool, and apply a light corrosion protection film. You store it so cutting edges are protected from contact and impact.

Where can you find additional technical data and the full range?

Use the catalog for overview tables and selection guidance. VD 23 catalog as PDF