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60 Degrees Cone Carbide Burr, SJ Type Die Grinder Bit
The 60-degree SJ cone: the all-purpose included angle for chamfers, countersink blending and V-groove work.
Design and Construction
A 60-degree included-angle cone coded SJ – the versatile middle of the angle family. Sharp enough to re-cut a chamfer, blunt enough (with radius option) to blend one.
How It Works
The 60° flank matches standard countersink and chamfer angles, so the head re-cuts existing features instead of fighting them.
Applications
Chamfer re-cutting, countersink blending, V-groove dressing, weld prep touch-up.
Field Cases
- Fabricator: 60° heads re-cut weld-prep chamfers to spec after gouging.
- Machine shop: countersink blends touched up without changing the angle.
- Structural: V-groove edges dressed before re-welding.
Performance Data
| Metric | Value / Observation |
|---|---|
| Included angle | 60 degrees (SJ) |
| Angle family | 30° / 45° / 60° / 90° available |
| Speed reference | About 35,000 RPM at 6 mm class |
| Profile match | Standard chamfer/countersink angles |
Suitable Materials
Steel, stainless steel and cast iron.
Material Comparison: Cone Angles: 30 vs 60 vs 90 Degrees
Which included angle for which feature – typical industry practice:
| Included Angle | Best Job | Character |
|---|---|---|
| 30° | Needle chamfers, deep V | Long thin cone |
| 45° | Standard countersinks | Balanced reach |
| 60° | Chamfer re-cut, weld prep | The all-rounder |
| 90° | Wide countersinks, center work | Short, stable |
| Angle matching | Re-cut existing features | Never fight the angle |
Delivery Scope
Bit in tube; the angle family stocked.
Why Choose VPOINT
One angle covers the standard chamfer map.
Precision & Quality Control
Included angle verified optically per batch.
Specifications
Angle information:
| Item | Specification |
|---|---|
| Type | SJ cone |
| Included angle | 60° |
| Shank | 6 mm (1/4″) |
| Cut type | Double cut |
Frequently Asked Questions
Why 60 degrees?
It matches the most common chamfer and countersink angles.
Other angles?
30/45/90 stocked in the family.
Will it re-cut my chamfer?
If it is 60° included – yes, to spec.
Speed?
About 35,000 RPM at 6 mm.
Radius option?
Available on the SJ family.
Related Search Terms
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