The Benchmark Abrasives SF-5NF aluma cut tree shape radius premium tungsten carbide burr is built for fabricators, machinists, welders, and metalworkers who need controlled material removal on aluminum and other soft nonferrous materials. 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 SF-5NF combines that premium construction with a large 1/2" tree-shaped profile, a rounded radius end, and Aluma Cut tooth geometry. Its tapered body transitions into a smooth rounded tip, making it well suited for broader rounded contours, edge rounding, blended transitions, and recessed shaping. The wider, more open tooth spacing provides chip clearance on aluminum and other soft nonferrous materials to help reduce chip packing during cutting.
Whether you're rounding larger edges, refining curved aluminum features, blending transitions, shaping recessed contours, or performing general nonferrous fabrication work, the SF-5NF provides more cutting surface than the smaller SF-3NF while retaining the same progressive contouring capability. The 1/4" shank fits compatible die grinders and rotary tools with a matching collet, while the standard-length 1/2" head is rated for a maximum speed of 50,000 RPM.
Features
- Premium tungsten carbide construction
- Aluma Cut tooth geometry for improved chip clearance
- Open tooth spacing suited for aluminum and soft nonferrous materials
- Large tree-shaped profile for rounded contours and progressive shaping
- Radius end for smooth blending and edge rounding
- 1/2" head for broader cutting contact
- 1" cutting length for extended contour engagement
- Suitable for deburring, shaping, blending, and medium stock removal
- 1/4" shank for compatible die grinders
- Sold individually
Applications
The SF-5NF tree radius-end profile is well suited for:
- Rounded contours
- Larger edge-rounding applications
- Blended transitions
- Recessed contour shaping
- Deburring aluminum parts
- Curved-edge cleanup
- Medium localized stock removal
- General nonferrous fabrication and maintenance work
Materials
The Aluma Cut tooth pattern is intended primarily for:
- Aluminum
- Other soft nonferrous materials
Its wider, more open tooth spacing is designed to provide chip clearance on softer materials where closely spaced cutting teeth can be more prone to loading.
Machine Compatibility
Designed for die grinders and other rotary tools equipped with a properly sized 1/4" collet.
Compatible examples include:
-
Benchmark Straight Pneumatic Die Grinder (BMT-DGST_1) — 1/4" collet, up to 25,000 RPM.
-
DEWALT DCG426B — 1/4" collet, variable speed up to 25,000 RPM.
-
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 SF-5NF tree radius-end shape uses a tapered body that narrows toward a rounded tip, giving the burr a progressive cutting profile for rounded contours, edge rounding, and blended transitions. Its 1/2" head and 1" cut length provide more cutting surface than the SF-3NF, making it better suited for broader features and medium stock removal.
Its Aluma Cut tooth pattern uses wider, more open spacing than a double-cut burr, providing additional room for chips to clear during cutting. This geometry is specifically useful on aluminum and other soft nonferrous materials where maintaining chip evacuation helps support a cleaner, more consistent cutting action.
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 aluminum row in the 1/2" chart as suggested starting guidance. Conventional die grinders commonly operate at 20,000–29,000 RPM; adjust within your machine’s range for smooth cutting. The other material rows are general burr references, not recommend
Do not exceed the 50,000 RPM maximum speed for this standard-length 1/2" carbide burr. Always operate within the lower maximum speed of the burr, machine, collet, or accessory system.
Safety Tips
-
- 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.
- Maintain control when rounding edges or transitioning through recessed contours.
- Avoid excessive force, which can increase heat, vibration, and premature cutting-edge wear.
- Select operating speed according to burr diameter, workpiece material, machine requirements, and the recommended operating-speed chart.
- Never exceed 50,000 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.
