The Benchmark Abrasives SM-3 Pointed Cone Shape Premium Tungsten Carbide Burr is built for fabricators, machinists, welders, and metalworkers who expect professional-grade cutting performance and dependable construction. Unlike lower quality burrs that may use hollow heads or inconsistent brazing, Benchmark carbide burrs feature a solid carbide head with a silver-brazed connection to the shank. The result is a strong, stable cutting tool made for demanding deburring, shaping, contouring, and material-removal applications.
The SM-3 combines that premium construction with a long 1/4" pointed cone profile and double-cut tooth pattern for controlled work in tight contours and pointed recesses. Its conical body progressively narrows toward the tip, while the extended 1" cutting length provides more working surface than the shorter SM-1 for deeper recesses, longer tapered features, and narrow internal contours. The intersecting double-cut flutes divide removed material into smaller chips, providing a more manageable cutting action and smoother result than a comparable single-cut burr while still removing material efficiently.
Whether you're shaping deep tapered recesses, refining V-shaped areas, deburring narrow features, cleaning up welds, or performing detailed fabrication and maintenance work, the SM-3 provides extended reach along the cutting head without increasing the 1/4" head diameter. The 1/4" shank fits compatible die grinders and rotary tools with a matching collet, while the standard-length 1/4" head is rated for a maximum speed of 70,000 RPM.
Features
- Premium tungsten carbide construction
- Double-cut design for efficient, controlled stock removal
- Pointed cone profile for tight contours and recessed features
- 1" cutting length for deeper and longer tapered features
- 1/4" head for controlled localized shaping
- Tapered geometry provides access into progressively narrower areas
- Produces smaller chips than comparable single-cut burrs
- Suitable for deburring, shaping, contouring, and localized material removal
- 1/4" shank for compatible die grinders
- Sold individually
Applications
The SM-3 pointed cone profile is well suited for:
- Tight contour shaping
- Deep pointed recesses
- V-shaped areas
- Longer tapered internal features
- Narrow internal transitions
- Recess cleanup
- Detailed deburring
- Weld cleanup
- Localized stock removal
- General fabrication and maintenance work
Materials
Recommended primarily for:
- Steel
- Stainless steel
- Cast iron
Also suitable for additional materials when the correct operating speed and technique are used, including titanium, nickel, wrought iron, copper, fiberglass, plastic, hard rubber, wood, and stone.
Machine Compatibility
Designed for die grinders and other rotary tools equipped with a properly sized 1/4" collet.
Compatible examples include:
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Benchmark Straight Pneumatic Die Grinder (BMT-DGST_1) — 1/4" collet, up to 25,000 RPM.
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DEWALT DCG426B — 1/4" collet, variable speed up to 25,000 RPM.
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Milwaukee 3485-20 — 1/4" collet, variable speed up to 20,000 RPM.
Always confirm the burr shank is securely seated in the correct collet and that the machine speed is appropriate for the burr diameter, workpiece material, and application.
Cutting Performance
The SM-3 pointed cone shape concentrates cutting action along a long tapered profile that becomes progressively narrower toward the tip. Its 1" cutting length gives it more working surface than the SM-1 while retaining the same 1/4" head diameter, making it especially useful for deeper pointed recesses, longer V-shaped features, and extended internal contours.
The double-cut pattern divides removed material into smaller chips, helping provide controlled stock removal and a smoother working feel than a comparable single-cut burr. Carbide burrs are primarily cutting and shaping tools; applications requiring a refined cosmetic finish should be followed with the appropriate abrasive finishing process.
Use the chart above as a starting guide to operating speed based on the 1/4" burr head diameter and workpiece material. These are suggested cutting ranges, not minimum machine speeds; conventional die grinders commonly run at 20,000–29,000 RPM.
Do not exceed the 70,000 RPM maximum speed for this standard-length 1/4" carbide burr. Always operate within the lower maximum speed of the burr, machine, collet, or accessory system.
Safety Tips
- Always wear appropriate eye, hearing, respiratory, and hand protection.
- Secure the workpiece before beginning operation.
- Confirm the 1/4" shank is properly seated and securely tightened in the correct collet.
- Use light, controlled pressure and allow the carbide cutting edges to remove the material.
- Keep the burr moving during cutting rather than holding it stationary against the workpiece.
- Avoid excessive force, especially near the pointed end.
- Select operating speed according to burr diameter, workpiece material, machine requirements, and the recommended operating-speed chart.
- Never exceed 70,000 RPM.
- Stop immediately if excessive vibration, chatter, unusual noise, or visible damage occurs.
- Do not use a damaged, chipped, bent, or improperly mounted carbide burr.
