Round Die BS 1127; 1950 (o/d 1 in) HSS - BSF 1/4 x 26

• Cut external threads on bolts, studs, and shafts during part manufacture and repair work
• Rework damaged external threads when a mating part no longer runs freely
• Use in maintenance, plant engineering, and metal fabrication where thread form and fit must match a drawing
• Clamp the die in a matching round die holder or die stock and keep the setup square 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

Note Select the variant that matches the thread standard, hand direction, and tolerance requirements stated in your drawing.

• Supports controlled external thread cutting with a defined profile
• Round die format can be clamped in common die holders depending on execution
• Standard based geometry helps you align the result to the specified thread system
• Tool steel grade supports repeatable cutting performance in common workshop materials depending on execution

• Limited performance in very hard, abrasive, or heat treated materials depending on tool grade and coating
• Not suitable for high volume production where cycle time and tool life must be maximized

1. Confirm the thread specification and direction in the product name and on the drawing
2. Prepare the workpiece blank and thread start according to your process plan
3. Mount the die in a suitable holder and secure it so it cannot rotate in the seat
4. Align the die square to the workpiece axis before you start cutting
5. Apply a cutting lubricant suited to the workpiece material
6. Cut the thread with steady feed while you keep the tool guided
7. Retract the tool and remove loose chips from the thread and die
8. Inspect the thread with a gauge or mating part and then clean the die for storage

• 1 piece: Round die

• Tool type: Round die
• Standard: BS 1127
• Material: HSS
• Thread system: BSF
• Tolerance: medium
• Thread designation: HSS - BSF 1/4 x 26

How do you choose the correct thread standard and designation? Match the thread system, pitch, and hand direction to the specification on your drawing and to the product name. If you work with inch based threads, also verify the designation and the intended fit before cutting. Which holder do you need for a round die? Use a suitable round die holder or guided die stock that clamps the die securely and keeps alignment. Holder features depend on execution, so check clamping method and guidance before use. What helps you avoid misalignment during the first turns? Start square to the work axis, apply suitable lubricant, and use a guide when available. If the die starts crooked, stop early and correct the setup to prevent damaged thread flanks. When should you replace or regrind the tool? Replace the die when cutting forces rise noticeably, the thread surface becomes rough, or the profile no longer meets your inspection method. Clean the tool first, since packed chips can mimic wear. How do you store the die after use? Remove chips, wipe off cutting fluid, and apply light corrosion protection if your storage is humid. Keep the cutting edges protected from contact with hard tools. Where can you find additional technical information for this tool type? Use the technical information document for background on geometry terms, selection logic, and handling notes. Technical information round dies as PDF What is a sensible inspection method after cutting? Use the inspection method defined in your quality plan and check fit and surface. If you see tearing or tight fit, review alignment, lubrication, and tool condition. Where can you find the full VÖLKEL catalog for selection support? Use the catalog for the complete range, execution variants, and reference tables. VD 23 catalog as PDF