Application

VÖLKEL Machine Tap Set M4-M10, Extra Long (120 mm) – Your Key to Hard-to-Reach Threads

Do you often face the challenge of cutting threads in places that are hard to reach with standard tools? The VÖLKEL Machine Tap Set M4-M10, extra long (120 mm), is the premium solution for exactly these situations. Equipped with the special Form C and 35° Right Spiral (RSP), these taps are your reliable partner for precise threads in blind holes and easy-to-machine materials up to 900 N/mm², including unalloyed and low-alloy steels.

What is This Machine Tap Set and Why Do You Need It?

This set contains machine taps according to DIN 371 for metric ISO thread sizes from M4 to M10. Each tap in this set is designed to cut precise internal threads in a single operation. Unlike shorter standard taps, which often fail due to accessibility issues, these extra-long taps (120 mm) provide the necessary reach.

Who Is This Special Set For?

This VÖLKEL tap set is ideal for you if you:

  • Work in repair and maintenance, where components are located deep within a structure.
  • Are involved in mechanical and plant engineering and need to cut threads in hard-to-reach housings or frames.
  • Are active in vehicle manufacturing or aerospace and have special requirements for reach.
  • Generally value highest precision and reliability in thread production in blind holes.

What Problem Does This Tap Set Solve for You?

The main problem this set solves is accessibility. Standard taps are often too short to cut threads in deep-seated or component-obscured locations. This leads to time-consuming disassemblies, compromises in quality, or, in the worst case, unusable workpieces.

This VÖLKEL set overcomes these obstacles with its extra-long design of 120 mm. But it's not just the length that makes it a problem-solver:

  • Form C (Taper Lead with Pilot Section): This special geometry provides a drawing cut that optimizes chip formation and allows for easy tapping. Chips are controlled, broken, and formed, which is particularly important for chip evacuation.
  • 35° Right Spiral (RSP): The helix of the flutes has a pronounced pitch that actively transports chips upwards out of the blind hole. This prevents clogging of the bore and reduces the risk of tool breakage, which is crucial when working deep.
  • Optimized for Blind Holes: The combination of Form C and the right spiral makes these taps ideal for blind holes. Chips are efficiently evacuated without accumulating at the bottom of the hole, resulting in clean and precise threads right to the bottom.

With this set, cumbersome work and compromises are a thing of the past. You'll cut threads precisely and efficiently, even in the most complicated places.

Why Should You Choose This VÖLKEL Machine Tap Set?

This VÖLKEL tap set offers you crucial advantages that will noticeably improve your work:

  • Premium HSS-E Material – Maximum Tool Life and Toughness: Made from HSSE (High-Speed Steel with Cobalt), these taps offer significantly improved wear resistance and hot hardness compared to conventional HSS. This means for you: longer tool life, even at higher cutting speeds and temperatures, as well as increased fracture toughness. You can rely on fewer tool changes and consistent production quality.
  • Extra Long Design (120 mm) – Maximum Reach: The 120 mm length is the unique selling point of this set. It allows you to cut threads in deep bores or in places obscured by other components. This saves you valuable time on disassembly and significantly expands your range of applications.
  • Optimal Chip Evacuation in Blind Holes (Form C / 35° RSP): The combination of the specially shaped taper lead (Form C) and the steep 35° right spiral is perfectly matched to the needs of blind holes. Chips are reliably transported upwards, preventing chip jams and ensuring clean thread quality right to the bottom of the hole.
  • Versatile for Common Materials: This set is designed for general use in easy-to-machine materials up to a tensile strength of 900 N/mm², including unalloyed and low-alloy steels. You get a universal set for many of your standard applications.
  • Precision According to DIN 371 and ISO 2 / 6H: Adherence to the DIN 371 standard and the ISO 2 / 6H tolerance guarantees that you cut threads with a precise fit. The set covers the most common sizes M4, M5, M6, M8, and M10, which are needed in many applications.
  • VÖLKEL Brand Quality – Trust and Reliability: VÖLKEL is an established name and stands for decades of experience and German engineering in threading tools. With this set, you invest in premium quality you can rely on.

Technical Details at a Glance

  • Thread Type: Metric ISO Thread DIN 13
  • Standard: DIN 371
  • Material: HSSE (High-Speed Steel with Cobalt)
  • Tolerance: ISO 2 / 6H
  • Nominal Size: M4 - M10 (consisting of M4, M5, M6, M8, M10)
  • Form: Form C with 35° Right Spiral (RSP)
  • Length: Extra long – 120 mm (total length per tap)
  • Application: For blind holes, easy-to-machine materials up to 900 N/mm², unalloyed and low-alloy steels
  • EAN: 4022835479369
  • Article Number: 47936

Frequently Asked Questions (FAQ)

1. When should I use an extra-long tap?
Extra-long taps are ideal when you need to cut threads in deep bores or when the bore is blocked by other components and a standard tap isn't sufficient. They avoid time-consuming disassemblies and enable precise work in hard-to-reach places.
2. What do Form C and 35° Right Spiral (RSP) mean?
Form C refers to a tap with a pilot section of approx. 2-3 threads that pushes chips forward. However, in combination with a Right Spiral (RSP) of 35°, the chips are actively transported upwards out of the bore due to the helix. This combination is optimal for blind holes, as it ensures efficient chip evacuation and prevents the hole from clogging.
3. What materials is this set suitable for?
This set is designed for general use in easy-to-machine materials up to a tensile strength of 900 N/mm². This particularly includes unalloyed and low-alloy steels. For very hard or high-alloy materials, such as certain stainless steels, you may need specialized taps with different coatings or made from PM-HSSE.
4. Do I need a special coolant for these taps?
For optimal results and to maximize tool life, the use of a high-quality cutting oil or a suitable cooling lubricant emulsion is highly recommended. This reduces friction, dissipates heat, and improves chip evacuation, which is especially important for long taps.


Invest in the VÖLKEL Machine Tap Set M4-M10, extra long (120 mm) and experience precise thread production even in the hardest-to-reach places!

Additional information
Type of thread metric ISO-thread DIN 13
Standard DIN 371
Material HSS-E
Tolerance ISO 2 / 6H
Size M4-M10
EAN 4022835479369
Item number 47936
Die visible through a larger die.
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