The Benchmark Abrasives SB-5NF aluma cut cylinder shape end cut premium tungsten carbide burr is built for fabricators, machinists, welders, and metalworkers who need fast, 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 SB-5NF combines that premium construction with a large 1/2" cylinder profile, an end-cutting face, and Aluma Cut tooth geometry. Its wider, more open tooth spacing provides chip clearance on aluminum and other soft nonferrous materials, helping reduce chip packing during cutting. The end-cut design allows the burr to work along sidewalls and straight contours while also cutting into shoulders, flat-bottom features, and localized recesses.
Whether you're deburring larger aluminum components, cleaning fabricated shoulders, refining straight walls, shaping flat-bottom recesses, or removing material across broader features, the SB-5NF provides more cutting surface than the smaller SB-3NF while retaining the same versatile side-and-end cutting geometry. 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
- End-cutting face for shoulders and flat-bottom features
- 1/2" cylinder head for broader cutting contact
- 1" cutting length for extended surface engagement
- Suitable for deburring, shaping, contouring, and medium stock removal
- 1/4" shank for compatible die grinders
- Sold individually
Applications
The SB-5NF cylinder end-cut profile is well suited for:
- Sidewall contouring
- Shoulder cleanup
- Flat-bottom contour work
- Deburring aluminum parts
- Cleaning fabricated edges
- Refining straight internal contours
- Localized frontal cutting
- Medium 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:
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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 SB-5NF uses a straight-sided cylinder profile with an end-cutting face, giving it greater versatility than a plain-end cylinder. The side flutes are suited for straight-wall and contour work, while the cutting face allows controlled material removal into shoulders, flat-bottom features, and localized recesses.
Its 1/2" head and 1" cut length provide substantially more cutting surface than the SB-3NF, making it better suited for broader features and medium stock removal. The Aluma Cut tooth pattern uses wider, more open spacing than a double-cut burr, providing additional room for chips to clear during cutting on aluminum and other soft nonferrous materials.
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
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- 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.
- Use extra control when engaging the end-cutting face.
- Keep the burr moving during cutting rather than holding it stationary against the workpiece.
- 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.
