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SB-51M 3 mm Tungsten Carbide Burr Bits, 1/8 Shank Inverted Cone
The SB-51M: a 3 mm inverted-cone carbide burr on a 1/8 shank – undercut and chamfer work at precision scale.
Design and Construction
SB-51M: an inverted-cone (counter-sinking style) carbide head, 3 mm class, on a 3 mm (1/8) shank. The cone cuts undercuts, internal chamfers and back-deburr operations a ball or cylinder cannot reach.
How It Works
Presented into the hole from the far side, the cone cuts the chamfer or undercut in one sweep at 30,000-50,000 RPM.
Applications
Back-deburring holes, internal chamfers, undercut cleanup, small-part machining support.
Field Cases
- Machining cell: SB-51M back-deburred cross-holes where a file could not reach.
- Electronics housings: internal chamfers cut without flipping the panel.
- Model shop: undercut cleanup on 3 mm features.
Performance Data
| Metric | Value / Observation |
|---|---|
| Code | SB-51M, inverted cone, 3 mm class |
| Shank | 3 mm (1/8″) |
| Speed range | 30,000-50,000 RPM |
| Unique geometry | Cuts where ball/cylinder heads cannot |
Suitable Materials
Aluminium, brass, steel and plastics.
Material Comparison: Inverted Cone (SB-51M) vs Ball vs Cylinder at 3 mm
What the inverted cone alone can do:
| Job | Inverted Cone (this bit) | Ball Nose | Cylinder |
|---|---|---|---|
| Back-deburr holes | Yes – cuts from the far side | No | No |
| Internal chamfer | Yes | No | No |
| Undercut cleanup | Yes | Partial | No |
| General blending | Limited | Best | Flat work |
Delivery Scope
Burr in protective cap; other 3 mm codes available.
Why Choose VPOINT
The inverted cone is the only geometry that back-cuts – stocked at precision scale.
Precision & Quality Control
Cone angle checked per batch; small heads magnification-inspected.
Specifications
Code information:
| Item | Specification |
|---|---|
| Code | SB-51M |
| Head | Inverted cone, 3 mm class |
| Shank | 3 mm (1/8″) |
| Cut type | Double cut |
Frequently Asked Questions
What is an inverted cone for?
Back-deburring, internal chamfers and undercuts.
Will it fit my rotary tool?
The 3 mm (1/8″) shank fits standard precision collets.
Which materials?
Aluminium, brass, steel and plastics.
Other 3 mm codes?
Yes – the SB small series covers several profiles.
Speed?
30,000-50,000 RPM.
Related Search Terms
SB-51M carbide burr, inverted cone burr, 3mm carbide burr 1/8, back deburring tool, internal chamfer burr, undercut carbide burr, precision rotary burrs, small part deburring, detail grinding bits, miniature carbide tools, model making burrs, jewellery grinding bits, hobby rotary tools, electronics deburring, fine detail burrs, craft rotary files
