Round Die DIN 223 (DIN EN 22568) HSS - UNC No. 4 x 40

• Cut external threads on prepared rods, bolts, studs, and similar round workpieces in repair, maintenance, and small batch work.
• Select the die by thread system, nominal size, pitch or threads per inch, thread direction, and tolerance class before starting the operation.
• Use a round die holder or die stock so the die starts square to the workpiece axis and stays aligned during cutting.
• Use for general workshop applications on prepared external thread blanks.
• Use on well machinable materials up to 800 N/mm² when the workpiece preparation and lubrication are controlled.
• Use on unalloyed and low alloy steels when the selected thread system and tolerance match the component drawing.
• 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 Confirm the external thread data, bolt preparation, and material condition before cutting. Stop the operation when resistance rises sharply and check alignment, lubrication, and chip evacuation.

• Unified coarse thread data in the product record supports selection by thread system instead of visual comparison.
• DIN 223 and DIN EN 22568 reference in the product data gives a clear standard context for the die format.
• The round die format can be clamped in a die holder so you can guide the tool square to the workpiece axis.
• VS execution supports general use in well machinable materials when lubrication and chip evacuation are controlled.

• Tool performance is limited when the material hardness or surface condition is outside the suitable range for the selected die execution.
• Manual alignment and feed control require care, especially on long thread starts or when access around the workpiece is restricted.

1. Check the component drawing and confirm that the thread designation on the die matches the required external thread.
2. Prepare the workpiece with the correct blank diameter and a clean lead in chamfer.
3. Clamp the round die securely in a suitable holder with the entry side facing the workpiece.
4. Apply cutting fluid to the workpiece surface and to the die entry area.
5. Place the die square to the workpiece axis and start the first turns with steady axial pressure.
6. Continue the cut with controlled rotation while keeping the holder aligned to the workpiece axis.
7. Reverse briefly at intervals to clear chips from the cutting edges and then continue with steady feed.
8. Back the die off fully after the required thread length is reached.
9. Clean the thread and verify the fit with the mating component or a suitable external thread gauge.

• 1 piece Round Die DIN 223 (DIN EN 22568) HSS - UNC No. 4 x 40

• Product type: Round die
• Standard: DIN 223 (DIN EN 22568)
• Thread designation: UNC No. 4 x 40
• Thread system: Unified coarse thread
• Thread standard: ANSI B1.1
• Tolerance class: 2A
• Thread direction: Right hand thread
• Tool material: HSS
• Execution: VS-B
• Recommended bolt diameter: 2.76 mm
• Outer diameter: 20 mm
• Packaging unit: 1 piece

How do you select this round die correctly?

Match UNC No. 4 x 40 to the required external thread and compare thread system, pitch or threads per inch, direction, tolerance class, and workpiece material before you cut.

What does Unified coarse thread mean for selection?

UNC is an inch based Unified coarse thread. Selection depends on nominal inch size, threads per inch, and the required external thread tolerance.

Which holder should you use with this die?

Use a round die holder or die stock that clamps the die securely and helps keep the cutting axis square to the workpiece.

Which workpiece checks are important before cutting?

Check blank diameter, lead in chamfer, material condition, and available thread length before the die touches the workpiece.

Where can you find additional technical information on round dies?

Use this reference for general handling and setup notes: Technical information round dies as PDF

How do you reduce the risk of a poor external thread?

Keep the die square, use suitable cutting fluid, clear chips regularly, and verify the first finished thread against the mating part or a gauge.

Where can you find more VÖLKEL threading tool information for selection and application?

Use the catalog for product family context and additional selection data: VD 23 catalog as PDF