The Benchmark Abrasives SM-42 Pointed Cone Shape Premium Tungsten Carbide Burr is built for fabricators, machinists, welders, and metalworkers who need precise cutting performance in tight contours, pointed recesses, and confined detail work. 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 designed for demanding deburring, shaping, contouring, and localized material-removal applications.
The SM-42 combines that premium construction with a compact 1/8" pointed-cone head and double-cut tooth pattern for controlled stock removal. Its conical profile narrows toward a pointed end, making it especially useful for tight recesses, narrow internal contours, and detail work where a broader or rounded burr would limit access.
With both a 1/8" head and 1/8" shank, the SM-42 is a compact option for detailed metalworking and precision shaping. Its small pointed-cone profile provides excellent access to confined features, while the standard-length 1/8" head is rated for a maximum speed of 90,000 RPM.
Features
- Premium tungsten carbide construction
- Double-cut design for efficient, controlled stock removal
- Compact 1/8" pointed-cone head for detailed work
- Conical profile for tight contours and pointed recesses
- Narrowing tip for increased access into confined features
- Produces smaller chips than a comparable single-cut burr
- 1/8" shank for compatible rotary tools and precision grinders
- Suitable for deburring, shaping, contouring, and localized material removal
- Sold individually
Applications
The SM-42 pointed-cone profile is well suited for:
- Tight contours
- Pointed recesses
- Narrow internal features
- Confined detail work
- Recess shaping
- Detailed deburring
- Edge and contour refinement
- 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 rotary tools, precision grinders, and other compatible machines equipped with a properly sized 1/8" collet or chuck.
Compatible examples include Dremel® 4300, 4000, and 3000 fitted with a Dremel 480 1/8" collet and matching collet nut. The 4300 can also hold the 1/8" shank in its keyless chuck.
Always confirm the 1/8" shank is securely seated in the correct collet or chuck before operation. A 1/8" shank is not interchangeable with 3 mm tooling.
Cutting Performance
The SM-42 pointed-cone shape provides a progressively narrowing cutting profile that concentrates access toward the tip. This geometry is especially useful for tight contours, pointed recesses, narrow internal features, and localized shaping where a broader-radius burr would not reach as effectively.
Compared with a pointed-tree shape, the SM profile has a more continuously conical geometry that is well suited for pointed recesses and tight contour work. The double-cut tooth pattern divides removed material into smaller chips, helping provide controlled stock removal and a smoother working action 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 to select the recommended operating-speed range based on the 1/8" burr head diameter and workpiece material.
Do not exceed the 90,000 RPM maximum speed for this standard-length 1/8" carbide burr. Always operate within the lower maximum speed of the burr, machine, collet, chuck, or accessory system.
Safety Tips
- Always wear appropriate eye, hearing, respiratory, and hand protection.
- Secure the workpiece before beginning operation.
- Confirm the 1/8" shank is properly seated and securely tightened in the correct collet or chuck.
- 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.
- Use extra control when working with the pointed end in narrow or confined features.
- Avoid excessive force, especially with the small 1/8" head diameter.
- Select operating speed according to burr diameter, workpiece material, machine requirements, and the recommended operating-speed chart.
- Never exceed 90,000 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.
