The Benchmark Abrasives SL-42 Taper Shape Radius Premium Tungsten Carbide Burr is built for fabricators, machinists, welders, and metalworkers who need precise cutting performance in tapered contours, narrow recesses, and rounded internal transitions. 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 localized material-removal applications.
The SL-42 combines that premium construction with a slim 1/8" tapered head, rounded end, and double-cut tooth pattern for controlled stock removal. Its extended 1/2" cutting length provides more tapered working surface than the shorter SL-41, allowing the operator to follow longer narrow contours while the radius end helps blend transitions without concentrating the cut at a sharp point.
With both a 1/8" head and 1/8" shank, the SL-42 is a compact option for detailed metalworking and precision contouring. Its narrow profile provides excellent access to confined areas, while the standard-length 1/8" head is rated for a maximum speed of 90,000 RPM.
Features
- Premium tungsten carbide construction
- Double-cut design for efficient, controlled stock removal
- Slim 1/8" tapered head for detailed and confined-area work
- 1/2" cutting length for longer tapered contours
- Radius end for rounded transitions and contour blending
- Progressive taper for access into narrow features
- 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 SL-42 taper radius-end profile is well suited for:
- Tapered contours
- Rounded transitions
- Narrow recesses
- Longer confined features
- Internal shaping
- Blended contours
- Detailed deburring
- Edge and contour refinement
- 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 SL-42 taper radius-end shape provides a progressively narrowing cutting profile with a rounded tip, making it especially useful for tapered contours, narrow recesses, and smooth internal transitions. The taper allows the operator to vary cutting contact along the head, while the radius end helps blend curved features without leaving the abrupt transition associated with a sharp point.
Its 1/2" cutting length gives the SL-42 a longer tapered working surface than the SL-41, making it useful when the feature requires additional reach along the contour while retaining the same compact 1/8" head diameter. The double-cut tooth pattern divides removed material into smaller chips, helping provide controlled stock removal and a smoother working action than a comparable single-cut burr.
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 1/8" 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 working into narrow tapered 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.
