Product Specification
SF-51NF TREE SHAPE RADIUS ALUMA CUT CARBIDE BURR – 1/8" SHANK
The Benchmark Abrasives SF-51NF tree shape radius premium tungsten carbide burr is built for fabricators, machinists, metalworkers, and detail-oriented users who need controlled cutting performance on aluminum and other soft nonferrous materials in tight, curved, or contoured areas. 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 precise deburring, shaping, contouring, edge rounding, and localized material removal.
The SF-51NF combines that premium construction with a compact 1/4" 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 rounded contours, edge rounding, blended transitions, and recessed shaping. The wider, more open tooth spacing provides improved chip clearance on aluminum and other soft nonferrous materials to help reduce chip packing during cutting.
Its 1/8" shank makes the SF-51NF well suited for compatible rotary tools and precision grinders equipped with the correct 1/8" collet or chuck. The compact tree-radius profile provides excellent control in detailed applications, while the standard-length 1/4" head is rated for a maximum speed of 70,000 RPM.
Product Specifications
| Specification |
Details |
| Product Code |
SF-51NF |
| Burr Material |
Tungsten Carbide |
| Head Shape |
Tree, Radius End |
| Cut |
Aluma Cut |
| Head Diameter |
1/4" |
| Cut Length |
1/2" |
| Shank Diameter |
1/8" |
| Overall Length |
2" |
| Max RPM |
70,000 RPM |
| Quantity |
1 Piece |
Features
- Premium tungsten carbide construction
- Aluma Cut tooth geometry for improved chip clearance
- Open tooth spacing suited for aluminum and soft nonferrous materials
- Tree-shaped profile for rounded contours and progressive shaping
- Radius end for smooth blending and edge rounding
- Compact 1/4" head for detailed work and confined areas
- 1/2" cutting length for useful contour engagement
- 1/8" shank for compatible rotary tools and precision grinders
- Suitable for deburring, shaping, contouring, and localized stock removal
- Sold individually
Applications
The SF-51NF tree radius-end profile is well suited for:
- Rounded contours
- Edge rounding
- Blended transitions
- Recessed contour shaping
- Deburring aluminum components
- Curved-edge cleanup
- Detailed internal shaping
- 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 better chip clearance on softer materials where closely spaced cutting teeth can be more prone to loading.
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 SF-51NF 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. Compared with a straight cylinder, the tree shape provides more flexibility for changing contour widths and following shaped surfaces, while the radius end avoids the aggressive point contact of a pointed-tree burr.
Its compact 1/4" head provides excellent access and control in tighter areas, while the Aluma Cut tooth pattern uses wider, more open spacing than a double-cut pattern to provide 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 chart above to select the recommended operating-speed range based on the 1/4" burr head diameter and workpiece material.
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, chuck, or accessory system.
Safety Tips
-
- 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.
- 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 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.
