This round die supports workshop production and repair of external threads with thread designation NPS 1/2 x 14 according to JIS B-4451 in HSS. It is selected by the exact thread designation, the applicable standard, the tool material, and the required external thread tolerance. The round body is clamped in a die holder or die stock, and the cut depends on a square start and steady guidance.
The thread designation in the product name is the primary selection reference, so the tool must match the drawing, the mating part, and the required hand direction. If the part is a repair job, clean the damaged thread first and stop cutting if resistance rises sharply, because misalignment can enlarge or deform the external thread.
- External thread cutting on prepared bolts, studs, shafts, and similar cylindrical workpieces.
- Repair and rework of external threads when the existing part can still guide the die correctly.
- Use in metalworking, mechanical engineering, industrial maintenance, and small batch production.
- Mounting in a round die holder or die stock with controlled alignment to the workpiece axis.
- Process: manual driving or assisted driving depending on your holder and machine setup
- Use: thread cutting, re tapping, and thread cleaning depending on condition
- Selection by thread designation NPS 1/2 x 14 and the required drawing specification.
Note Confirm the thread designation, the holder or driving method, the workpiece material, and the inspection requirement before starting the operation.
- Round die format supports external thread cutting with guidance from a matching die holder or die stock.
- Standard based selection is clear because the product data names JIS B-4451.
- Tool material HSS gives a defined basis for choosing cutting conditions.
- Tolerance class medium supports fit oriented selection for external threads.
Drawbacks
- Performance is limited when the workpiece material is harder or more abrasive than the selected tool execution can handle.
- Manual or semi guided use needs careful alignment and is not a replacement for a validated high volume production process.
- Confirm the thread designation, hand direction, and tolerance requirement against the drawing.
- Prepare the blank and remove burrs from the thread start.
- Mount the round die in a suitable die holder or die stock.
- Align the die square to the workpiece axis before the first turn.
- Apply cutting lubricant matched to the workpiece material.
- Cut with steady feed while keeping the holder level and guided.
- Reverse briefly when chips load the cutting area, then continue with controlled feed.
- Back the die off fully and clean the finished thread.
- Inspect the external thread according to the required fit and clean the die before storage.
- 1 piece Round Die JIS B-4451 HSS - NPS 1/2 x 14
- Product type: Round die
- Standard: JIS B-4451
- Tool material or execution: HSS
- Thread system: NPS
- Thread designation: NPS 1/2 x 14
- Thread direction: Right hand thread
- Tolerance class: medium
- Recommended bolt diameter: 20.83 mm
- Outside diameter: 50 mm
- Thickness or height: 6 mm
- Packaging unit: 1
- How do you choose the correct round die for this thread?
- Choose the round die by the exact thread designation NPS 1/2 x 14, hand direction, standard, and tolerance requirement. A similar nominal size with another pitch or thread count is not interchangeable.
- Which holder do you need for a round die?
- Use a round die holder or die stock that matches the outside size of the die and clamps the body securely. Do not infer holder fit from the thread size alone.
- What should you check before cutting an external thread?
- Check the blank diameter from your process data, remove burrs, confirm the thread direction, and prepare lubrication before the die touches the workpiece.
- How do you reduce the risk of a tapered external thread?
- Keep the die square to the workpiece axis, use steady feed, and stop early if the first turns do not track evenly.
- Where can you find technical information for round dies?
- Use the technical information document for handling, selection, and geometry context. Technical information round dies as PDF
- When is a round die not the right tool?
- A round die is not the best choice when the part requires a validated high volume process, a thread forming process, or a thread condition that cannot be inspected after cutting.
- How should you inspect the thread after cutting?
- Use the inspection method specified for the job, such as a matching gauge or approved mating part, and check both fit and surface condition.
- Where can you find the VÖLKEL catalog for additional variants?
- Use the catalog for the full threading tool range, execution variants, and reference information. VD 23 catalog as PDF
Do you need help selecting or using the product?
Use the contact form.
In this category: Threading tools
