Hand Tap set of 2 pieces DIN 2181 HSS-G - M 21 x 1.5

• Cut internal threads with the designation M 21 x 1.5 in prepared core holes.
• Use for repair, assembly, toolroom work, and small batch production where manual control is required.
• Drive the tap with a suitable tap wrench and keep the tap aligned with the hole axis.
• Check the core hole diameter, material condition, and thread depth before tapping.
• 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 suitable cutting lubricant and stop if the tap binds or the alignment changes. The product data lists a core hole diameter of 19.5 mm.

• Two piece hand tap set supports staged internal thread cutting in controlled manual operations.
• HSS-G execution provides a ground tool material basis when this execution is stated in the product name.
• Tolerance and core hole data support reliable selection for the specified internal thread.
• Manual tapping is practical for repair and fitting work where a machine spindle is not used.

• Manual tapping requires stable alignment and careful feed to avoid oversize or angled threads.
• It is slower than machine tapping for recurring production quantities.

1. Confirm the thread designation and the required internal thread depth on the drawing.
2. Prepare the core hole according to the product data or your process plan.
3. Clamp the workpiece securely so the hole axis remains stable during tapping.
4. Mount the first tap in a suitable tap wrench and apply cutting lubricant.
5. Start the tap square to the hole axis with light, even pressure.
6. Continue with controlled rotation and clear chips regularly from the flutes.
7. Change to the next tap from the set when the first tapping stage is complete.
8. Clean the internal thread after tapping and remove loose chips from the hole.
9. Verify the thread with the defined inspection method before assembly.

• 1 set with 2 pieces: Hand Tap set of 2 pieces DIN 2181 HSS-G - M 21 x 1.5

• Product type: Hand tap set
• Standard: DIN 2181
• Thread designation: M 21 x 1.5
• Thread system: Metric fine
• Tool material: HSS-G
• Thread standard: DIN 13
• Tolerance class: ISO2 (6H)
• Overall length: 80 mm
• Thread length: 22 mm
• Shank diameter: 16 mm
• Core hole diameter: 19.5 mm
• Thread direction: Right hand thread

How do you choose the correct hand tap set?

Choose the set by the exact thread designation M 21 x 1.5, tolerance class, tool material, and the required internal thread application.

Why is the core hole important for this product?

The core hole controls thread percentage and cutting load, so a wrong core hole can create tight threads, weak threads, or tap breakage.

Which holder should you use for manual tapping?

Use a tap wrench that grips the square shank securely and lets you keep the tap aligned with the hole axis.

Where can you find technical information for hand taps?

Use the hand tap technical information for general handling and selection context: Technical information hand taps as PDF

How do you avoid damaging the first thread turns?

Start square to the hole axis, apply suitable lubricant, and use low side force during the first engagement.

When do you use a two piece set instead of a single tap?

Use the set when staged manual cutting is required and the process benefits from a controlled first and finishing operation.

Where can you find the VÖLKEL catalog for threading tool selection?

Use the catalog for the broader range and selection context: VD 23 catalog as PDF