The Benchmark Abrasives SC-42 Cylinder Shape Radius End Premium Tungsten Carbide Burr is built for fabricators, machinists, welders, and metalworkers who need precise cutting performance in narrow, curved, or transitioning features. 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 SC-42 combines that premium construction with a slim 1/8" cylinder head, rounded radius end, and double-cut tooth pattern for controlled stock removal. Its straight-sided profile provides consistent cutting along narrow walls and edges, while the radius end helps blend smoothly through rounded internal transitions and curved contours without the abrupt corner of a flat-ended cylinder.
With both a 1/8" head and 1/8" shank, the SC-42 is a compact option for detailed metalworking and precision shaping. Its small diameter provides excellent access to tight features, while the radius-end geometry adds versatility for contour blending and rounded transitions.
Features
- Premium tungsten carbide construction
- Double-cut design for efficient, controlled stock removal
- Slim 1/8" cylinder head for detailed and confined-area work
- Radius end for rounded internal transitions and contour blending
- Straight-sided profile for narrow walls and consistent contours
- 9/16" 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 SC-42 cylinder radius-end profile is well suited for:
- Rounded internal transitions
- Narrow sidewall contouring
- Curved interior features
- Recess cleanup
- Detailed deburring
- Edge blending
- 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 SC-42 combines a narrow straight-sided cylinder with a rounded radius end, giving it more contouring flexibility than a plain-end cylinder. The side flutes are useful for narrow walls, edges, and consistent profiles, while the rounded end transitions more smoothly through internal curves and blended features.
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. Its 1/8" head diameter makes the SC-42 especially useful in confined areas where larger radius-end burrs would limit access.
Carbide burrs are primarily cutting and shaping tools; applications requiring a refined cosmetic finish should be followed with the appropriate abrasive finishing process.
Recommended Operating Speed, by Material
[INLINE GRAPHIC: 1/8" Recommended Operating Speed, by Material]
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.
- Maintain control when transitioning through rounded or recessed 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.
