Design and Construction — a VPOINT tungsten carbide burr bit in the standard SA–SM head-code system, 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

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

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:

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:

Frequently Asked Questions

Which head code do I need?

＋The SA–SM code defines the contour: SA cylinder, SC ball-nose end, SD ball, SF tree-pointed, SH tree-radius, SL tree-tapered, SM cone. Match the contour to the cavity or corner you are shaping.

Can I use one burr across different metals?

＋Yes with the right flute style — double-cut for steel and iron, Aluma-cut for aluminium and soft non-ferrous. Swapping styles between jobs keeps edges clean.

Are custom shanks or head sizes available?

＋Yes — non-standard head diameters, shank sizes and logo marking are produced to order from drawings.

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