This round die produces external threads on bolts, studs, shafts, and similar cylindrical parts where the drawing specifies UNC 5/8 x 11. It is selected by the exact thread designation, the applicable standard, the tolerance class, and the material execution. UNC is a Unified coarse thread series used for inch based external threads where robust engagement and matching mating parts are required.
Use the die in a stable holder and start it with a clean lead in chamfer so the cutting edges enter evenly. The product is best suited to repair, fitting, prototype, and maintenance work where you need controlled engagement rather than a dedicated production thread cutting cycle.
- Cut or rework external threads with the designation UNC 5/8 x 11 on prepared bolts, studs, shafts, and threaded repair parts.
- Use in maintenance workshops, mechanical engineering, fixture building, and metal fabrication where an external thread must match the drawing.
- Clamp the round die in a suitable die holder or die stock and keep the holder square to the workpiece axis.
- Check thread system, pitch, tolerance class, and hand direction before the first cut.
- 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 drawing thread designation and prepare a clean lead in chamfer before cutting. The product data lists a recommended bolt diameter of 15.68 mm.
- Direct selection by thread designation reduces the risk of mixing inch and metric thread systems.
- Holder guided use gives you tactile control during repair and fitting work.
- SML data such as tolerance and standard supports clear product differentiation in the shop import.
- Compact tool format is practical for maintenance cases where a machine thread cutting setup is not available.
Drawbacks
- Thread quality is sensitive to blank preparation, holder alignment, lubrication, and tool condition.
- Manual or assisted die cutting is less efficient than validated production processes for large series.
- Confirm that the thread designation on the drawing matches the product name and the product data.
- Prepare the workpiece blank and create a clean lead in chamfer at the thread start.
- Clamp the round die securely in a suitable holder before the die touches the workpiece.
- Apply cutting lubricant to the entry side of the die and the prepared workpiece surface.
- Align the holder square to the workpiece axis and start the first turns with steady pressure.
- Advance the die with controlled rotation while keeping the holder guided on the same axis.
- Reverse briefly at intervals to clear chips from the cutting area.
- Back the die off the workpiece after the required thread length is reached.
- Clean the thread and verify the fit with the defined inspection method.
- 1 piece: Round Die BS 1127; 1950 (o/d 2 in) HSS - UNC 5/8 x 11
- Product type: Round die
- Standard: BS 1127, 1950
- Thread designation: UNC 5/8 x 11
- Thread system: UNC
- Tool material: HSS
- Thread standard: ANSI B1.1
- Tolerance class: 2A
- Recommended bolt diameter: 15.68 mm
- Outside diameter: 50.8 mm
- Outside diameter: 2" inch
- Thickness: 5/8 mm
- Thread direction: Right hand thread
- How do you select the correct round die?
- Select the round die by the exact thread designation UNC 5/8 x 11, the thread system, tolerance class, direction, and tool material stated in the product data.
- Which holder should you use with a round die?
- Use a round die holder or die stock that supports the outside diameter and clamps the die securely without tilt.
- What preparation is important before cutting an external thread?
- Prepare the blank diameter, remove burrs, and create a clean lead in chamfer so the die starts square to the workpiece axis.
- Where can you find technical information for round dies?
- Use the round die technical information for setup and handling context: Technical information round dies as PDF
- How do you reduce the risk of a torn or tight thread?
- Keep the die aligned, use suitable cutting fluid, clear chips during the operation, and stop if the cutting load rises sharply.
- When should you inspect the thread after cutting?
- Inspect the thread after cleaning and before assembly so you can detect wrong pitch, poor surface quality, or incorrect fit before the part is used.
- 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
Do you need help selecting or using the product?
Use the contact form.
In this category: Threading tools
