The Benchmark Abrasives 1/4" Shaft 35 Piece Double Cut Burr Master Set gives fabricators, machinists, welders, and metalworkers a professional assortment of carbide burr shapes and sizes in one organized kit. Instead of building a collection one burr at a time, this set brings together 35 double-cut tungsten carbide burrs covering straight profiles, radius shapes, balls, ovals, trees, flames, countersinks, tapered profiles, and pointed cones. Each burr features a solid carbide head with a silver-brazed connection to the shank, avoiding the hollow-head or inconsistent brazing found on some lower-quality burrs.
The assortment is designed to cover a wide range of real shop work, from general deburring and weld cleanup to contouring, edge shaping, recessed work, countersinking, tapered features, and detailed material removal. Multiple sizes within the most commonly used shapes let you choose a smaller profile for control and access or step up to a larger head when more cutting surface is needed. The double-cut flute pattern divides removed material into smaller chips for an efficient, manageable cutting action and smoother result than a comparable single-cut burr.
Every burr in the set uses a 1/4" shank for compatible die grinders and rotary tools with a matching collet, and the complete assortment is supplied in a storage case to keep the different profiles organized and easy to identify. For a fabrication shop, maintenance department, machine shop, or serious metalworking setup, this master set provides a broad carbide-burr selection in one organized kit.
Features
- 35-piece professional carbide burr assortment
- Premium tungsten carbide construction
- Double-cut tooth patterns for efficient, controlled material removal
- Multiple head shapes and sizes for a wide range of fabrication tasks
- Common 1/4" shank across the entire set
- Covers general-purpose, contouring, recessed, tapered, and countersinking applications
- Multiple sizes in major shape families for greater application flexibility
- Organized storage case included
- Suitable for fabrication shops, maintenance departments, machine shops, and metalworking workstations
Set Contents
The set includes these 35 burrs, grouped by shape:
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SA – Cylinder, Plain End: SA-1, SA-3, SA-5
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SB – Cylinder, End Cut: SB-1, SB-3, SB-5
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SC – Cylinder, Radius End: SC-1, SC-3, SC-5
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SD – Ball: SD-1, SD-3, SD-5
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SE – Oval / Egg: SE-1, SE-3, SE-5
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SF – Tree, Radius End: SF-1, SF-3, SF-5
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SG – Pointed Tree: SG-1, SG-3, SG-5
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SH – Flame: SH-1, SH-2, SH-5
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SJ – 60° Countersink: SJ-3, SJ-5
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SK – 90° Countersink: SK-3, SK-5
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SL – Taper, Radius End: SL-1, SL-3, SL-4
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SM – Pointed Cone: SM-1, SM-3, SM-4, SM-5
Total: 35 carbide burrs
Applications
With twelve different shape families and multiple head sizes, the Burr Master Set covers a broad range of applications, including:
- Deburring machined and fabricated parts
- Weld cleanup and blending
- Surface and sidewall shaping
- Straight-edge and shoulder work
- Rounded internal transitions
- Concave surfaces and radiused cavities
- Sweeping and oval contours
- Angled and narrow features
- Recessed and confined areas
- Tapered contour shaping
- Pointed recesses and V-shaped areas
- 60° countersinking and chamfering
- 90° countersinking and chamfering
- Edge preparation
- Localized stock removal
- General fabrication and maintenance work
Materials
Recommended primarily for:
- Steel
- Stainless steel
- Cast iron
The included double-cut carbide burrs can also be used on additional materials when the correct burr, operating speed, and technique are selected, including titanium, nickel, wrought iron, copper, fiberglass, plastic, hard rubber, wood, and stone.
Machine Compatibility
All 35 burrs use a 1/4" shank and are 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 selected burr is securely seated in the collet and that machine speed is appropriate for that burr's individual head diameter, workpiece material, and application.
Cutting Performance
The advantage of a master set is having the correct geometry available instead of forcing one burr shape to handle every job. Cylinders provide controlled straight-sided cutting, radius-end profiles blend transitions, ball and oval shapes follow curved surfaces, tree and flame profiles handle contours and recessed work, countersink shapes create defined angles, and tapered or pointed profiles reach into progressively narrower areas.
Across the assortment, the double-cut flute pattern divides removed material into smaller chips for controlled stock removal and a smoother working feel than a comparable single-cut burr. Carbide burrs remain cutting and shaping tools; applications requiring a refined cosmetic or polished finish should be followed with the appropriate abrasive finishing process.
Select speed for the individual burr and material. The chart offers suggested cutting ranges, not minimum machine speeds; conventional die grinders commonly run at 20,000–29,000 RPM. Adjust speed and pressure for smooth cutting without exceeding the selected burr's maximum RPM.
Never exceed the maximum RPM for the individual burr being used, and always operate within the lower maximum speed of the burr, machine, collet, or accessory system.
Safety Tips
- Always wear appropriate eye, hearing, respiratory, and hand protection.
- Secure the workpiece before beginning operation.
- Confirm the selected burr's 1/4" shank is properly seated and securely tightened in the collet.
- Select the correct burr shape and size for the application before beginning work.
- 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.
- Avoid excessive force, which can increase heat, vibration, and premature cutting-edge wear.
- Select operating speed according to the individual burr head diameter, workpiece material, and machine requirements.
- Do not assume every burr in the set shares the same maximum 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.
