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K20 Power Tools Tungsten 25 mm Carbide Rotary Head
A 25 mm K20 cone for power-tool stock removal – big head, ISO K-class grade, serious metal per minute.
Design and Construction — a VPOINT cone-shape carbide burr for chamfer cleanup and taper work, sized for steel / stainless welds and similar work. YG8 carbide at HRA 89–91; die-grinder reference speeds are in the performance table below, with the flute-style guidance in the FAQ. ISO 9001 production, batch-verified, custom sizes from drawings.
Design and Construction
A 25 mm K20-grade cone head for power tools: the ISO K-class ultra-fine grade on a large head that plans broad surfaces – weld crowns on plate, casting pads, wide chamfers.
How It Works
Big heads need discipline: about 15,000-20,000 RPM (never exceed), light pressure, and the wide cone planes material that small heads grind away slowly.
Applications
Heavy plate fabrication, large casting finishing, structural rework, shipbuilding.
Field Cases
- Plate shop: a 25 mm head flattened a 300 mm weld crown in two passes.
- Shipbuilding: deck plate pads dressed where discs gouged.
- Heavy rework: wide chamfers re-cut to drawing on 40 mm plate.
Performance Data
| Metric | Value / Observation |
|---|---|
| Head diameter | 25 mm |
| Grade | K20 (ISO K-class ultra-fine) |
| Speed limit | About 15,000-20,000 RPM – never exceed |
| Removal | Broad plans per pass (typical) |
Suitable Materials
Steel plate, cast iron, structural steel.
Standard reference values for guidance only — always adjust to the workpiece material, the machine spindle speed and the feed, and confirm on the actual part.
Material Comparison: 25 mm K20 vs 12 mm vs 6 mm Heads – Scale Economics
What head scale changes on heavy work:
| Factor | 25 mm (this head) | 12 mm | 6 mm |
|---|---|---|---|
| Coverage per pass | Widest | Medium | Narrow |
| Max safe speed | About 15,000-20,000 RPM | About 30,000 RPM | About 50,000 RPM |
| Torque demand | Highest | Medium | Low |
| Job time on 300 mm weld | Two passes | Six passes | Many passes |
| Machine requirement | Powerful die grinder | Standard | Any |
Delivery Scope
Head in protective case; larger sizes on request.
Why Choose VPOINT
ISO K-grade on a big head – production-scale removal.
Precision & Quality Control
Large heads dynamically balanced at working speed.
Specifications
Scale information:
| Item | Specification |
|---|---|
| Head | Cone, 25 mm |
| Grade | K20 ISO K-class |
| Shank | 10-12 mm class |
| Limit | 15,000-20,000 RPM |
Frequently Asked Questions
Which cone angle for a countersink cleanup?
Match the burr angle to the countersink: 90° for standard screw seats, 60° for narrower chamfers, 30° for gentle tapers — one-pass edge breaks on cast iron and steel.
Cone or inverted cone?
Standard cone widens toward the tip for chamfer work; the inverted cone widens toward the shank and reaches into angled pockets.
Which cut style on cast iron?
Double-cut clears the abrasive chips fast; single-cut leaves a smoother finish on the tapered wall.
What is K20?
The ISO K-class ultra-fine carbide grade for high hardness duty.
Speed limit?
About 15,000-20,000 RPM – a 25 mm head must never overspeed.
Which machine?
A powerful die grinder with firm workholding.
Why so large?
Coverage – two passes instead of many on heavy plate.
Balance?
Dynamically checked at working speed.
Related Search Terms
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Sources & standards: ISO 9001 quality management · UNSPSC commodity codes · eClass product classification
