The Benchmark Abrasives SB-51 Cylinder Shape End Cut Premium Tungsten Carbide Burr is built for fabricators, machinists, welders, and metalworkers who need controlled stock removal with the added versatility of an end-cutting face. 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 material-removal applications.
The SB-51 combines that premium construction with a straight-sided 1/4" cylinder head, end-cutting face, and double-cut tooth pattern. Its geometry is especially useful for sidewalls, shoulders, flat-bottom contours, and localized recesses where the operator needs to remove material from both the sides and end of the burr. 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 aggressively.
Its 1/8" shank makes the SB-51 well suited for compatible rotary tools and precision grinders equipped with the correct 1/8" collet or chuck. The standard-length 1/4" head is rated for a maximum speed of 70,000 RPM, giving users a compact-shank carbide burr with increased versatility for detailed metalworking.
Features
- Premium tungsten carbide construction
- Double-cut design for efficient, controlled stock removal
- End-cutting face for shoulders and flat-bottom features
- Straight-sided cylinder profile for sidewalls and consistent contours
- 1/4" head diameter for versatile shaping and deburring
- 1/2" cutting length for useful surface engagement
- 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 SB-51 cylinder end-cut profile is well suited for:
- Sidewall contouring
- Shoulder cleanup
- Flat-bottom contour work
- Localized recesses
- Interior shaping
- 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 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 SB-51 combines a straight-sided cylinder with an end-cutting face, allowing the operator to remove material from both the sides and front of the burr. This makes it especially useful for sidewalls, shoulders, flat-bottom features, and recessed areas where a plain-end cylinder would be more limited.
The double-cut tooth pattern uses intersecting flutes to divide removed material into smaller chips, helping provide controlled stock removal and a smoother working action than a comparable single-cut burr. The 1/4" head provides a useful balance between cutting coverage and detailed access.
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
- 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.
- Use additional 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 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.
