Benchmark Abrasives 3" quick change discs for aluminum are engineered for fast grinding, weld blending, deburring, and surface preparation on aluminum and other soft non-ferrous metals that can quickly load conventional abrasives. The aluminum oxide grain is treated with a specialized stearate coating that helps resist loading, clogging, and gumming so the abrasive keeps cutting instead of packing up with soft metal.
As heat develops during sanding, the stearate treatment helps reduce aluminum buildup on the abrasive surface, promoting a cleaner cut, longer usable disc life, and less downtime replacing clogged abrasives. The larger 3" diameter gives you more working coverage on broader welds, castings, fabricated panels, and general surface work, while the Type R quick change attachment allows fast disc changes as the job moves from aggressive removal to blending and surface preparation.
Quantity: 25 Discs
Backing pad sold separately
Product Specifications
Specification
Details
Disc Diameter
3"
Abrasive Material
Aluminum Oxide
Coating
Stearate
Backing Material
X-Weight Cloth
Attachment Type
Type R Quick Change
Available Grits
36, 60
Mixed Grit Option
Available
Maximum RPM
25,000
Use
Dry Only
Required Holder
Matching 3" Type R backing pad; sold separately
Product Features
Designed specifically for aluminum and other soft non-ferrous metals
Stearate coating helps resist loading, clogging, and gumming
Helps reduce material buildup during grinding
Durable X-weight cloth backing for handheld sanding and grinding
Larger 3" diameter provides more coverage on broader work areas
36 and 60 grit options cover aggressive removal through controlled blending
Type R quick change attachment allows fast abrasive changes between work steps
Materials & Applications
Common Materials
Aluminum
Zinc
Copper
Tin
Fiberglass
Plastic
Hard Rubber
Wood
Stone
Common Applications
Removing and blending aluminum welds
Deburring cut or machined edges
Blending surface imperfections
Removing oxidation and minor corrosion
Preparing aluminum surfaces for painting or coating
Smoothing castings and fabricated components
Cleaning scratches, blemishes, and tool marks
General grinding and surface preparation
Use the least aggressive grit that removes the material efficiently to help control scratch depth and reduce the amount of refinement needed afterward.
Machine Compatibility
Designed for rotary quick change sanding tools using a matching 3" Type R backing pad.
Recommended Benchmark Abrasives Tools
Benchmark Abrasives Right Angle Pneumatic Quick Change Sander
Compatible with the Benchmark Abrasives BMT-QC90 Right Angle and BMT-QCPG Pistol Grip Quick Change Sanders when fitted with a matching 3" Type R holder and operated within the disc, holder, and tool speed ratings.
Safety Tips
Inspect the disc and holder before use
Fully secure the disc to the Type R holder before operating
Never exceed the maximum RPM of the lowest-rated component
Follow the tool manufacturer's operating and safety instructions
Frequently Asked Questions
Use a matching 3" Type R holder. Compatible choices include the Benchmark Abrasives BMT-QC90 Right Angle and BMT-QCPG Pistol Grip Quick Change Sanders. Other verified examples include Milwaukee 2984-20 with a suitable 1/4" shank holder and Dynabrade 48530, 48531, or 48532 with the matching 51346 Type R pad. Always confirm the RPM rating of the complete assembly.
Aluminum and other soft metals can quickly load conventional abrasives. The stearate coating helps reduce material buildup so the abrasive stays cleaner and continues cutting more effectively.
The stearate treatment helps reduce soft-metal buildup on the abrasive surface, which can help maintain a cleaner cut and extend usable abrasive life during aluminum grinding.
36 grit is the more aggressive option for heavier weld removal, deburring, and stock removal. 60 grit provides a more controlled cut for general grinding, blending, and surface preparation.
The 3" disc covers more surface area and is better suited for broader welds, larger fabricated parts, and general surface work. The 2" version is generally better for tighter access and more localized control.
Yes. The published material list includes aluminum, zinc, copper, and tin.
Yes. Surface preparation for painting and coating is one of the published applications. Because these discs use a stearate coating, follow the cleaning requirements of the downstream coating, welding, or finishing process before moving to the next step.
Use a matching 3" Type R quick change backing pad. The backing pad is sold separately.
No. These discs are specified for dry use only.
No. 25,000 RPM is the maximum rated speed. Never exceed the RPM rating of the lowest-rated component in the disc, holder, and tool assembly.
Benchmark Abrasives 3" quick change discs for aluminum are engineered for fast grinding, weld blending, deburring, and surface preparation on aluminum and other soft non-ferrous metals that can quickly load conventional abrasives. The aluminum oxide grain is treated with a specialized stearate coating that helps resist loading, clogging, and gumming so the abrasive keeps cutting instead of packing up with soft metal.
As heat develops during sanding, the stearate treatment helps reduce aluminum buildup on the abrasive surface, promoting a cleaner cut, longer usable disc life, and less downtime replacing clogged abrasives. The larger 3" diameter gives you more working coverage on broader welds, castings, fabricated panels, and general surface work, while the Type R quick change attachment allows fast disc changes as the job moves from aggressive removal to blending and surface preparation.
Quantity: 25 Discs
Backing pad sold separately
Product Specifications
Specification
Details
Disc Diameter
3"
Abrasive Material
Aluminum Oxide
Coating
Stearate
Backing Material
X-Weight Cloth
Attachment Type
Type R Quick Change
Available Grits
36, 60
Mixed Grit Option
Available
Maximum RPM
25,000
Use
Dry Only
Required Holder
Matching 3" Type R backing pad; sold separately
Product Features
Designed specifically for aluminum and other soft non-ferrous metals
Stearate coating helps resist loading, clogging, and gumming
Helps reduce material buildup during grinding
Durable X-weight cloth backing for handheld sanding and grinding
Larger 3" diameter provides more coverage on broader work areas
36 and 60 grit options cover aggressive removal through controlled blending
Type R quick change attachment allows fast abrasive changes between work steps
Materials & Applications
Common Materials
Aluminum
Zinc
Copper
Tin
Fiberglass
Plastic
Hard Rubber
Wood
Stone
Common Applications
Removing and blending aluminum welds
Deburring cut or machined edges
Blending surface imperfections
Removing oxidation and minor corrosion
Preparing aluminum surfaces for painting or coating
Smoothing castings and fabricated components
Cleaning scratches, blemishes, and tool marks
General grinding and surface preparation
Use the least aggressive grit that removes the material efficiently to help control scratch depth and reduce the amount of refinement needed afterward.
Machine Compatibility
Designed for rotary quick change sanding tools using a matching 3" Type R backing pad.
Recommended Benchmark Abrasives Tools
Benchmark Abrasives Right Angle Pneumatic Quick Change Sander
Compatible with the Benchmark Abrasives BMT-QC90 Right Angle and BMT-QCPG Pistol Grip Quick Change Sanders when fitted with a matching 3" Type R holder and operated within the disc, holder, and tool speed ratings.
Safety Tips
Inspect the disc and holder before use
Fully secure the disc to the Type R holder before operating
Never exceed the maximum RPM of the lowest-rated component
Follow the tool manufacturer's operating and safety instructions
Frequently Asked Questions
Use a matching 3" Type R holder. Compatible choices include the Benchmark Abrasives BMT-QC90 Right Angle and BMT-QCPG Pistol Grip Quick Change Sanders. Other verified examples include Milwaukee 2984-20 with a suitable 1/4" shank holder and Dynabrade 48530, 48531, or 48532 with the matching 51346 Type R pad. Always confirm the RPM rating of the complete assembly.
Aluminum and other soft metals can quickly load conventional abrasives. The stearate coating helps reduce material buildup so the abrasive stays cleaner and continues cutting more effectively.
The stearate treatment helps reduce soft-metal buildup on the abrasive surface, which can help maintain a cleaner cut and extend usable abrasive life during aluminum grinding.
36 grit is the more aggressive option for heavier weld removal, deburring, and stock removal. 60 grit provides a more controlled cut for general grinding, blending, and surface preparation.
The 3" disc covers more surface area and is better suited for broader welds, larger fabricated parts, and general surface work. The 2" version is generally better for tighter access and more localized control.
Yes. The published material list includes aluminum, zinc, copper, and tin.
Yes. Surface preparation for painting and coating is one of the published applications. Because these discs use a stearate coating, follow the cleaning requirements of the downstream coating, welding, or finishing process before moving to the next step.
Use a matching 3" Type R quick change backing pad. The backing pad is sold separately.
No. These discs are specified for dry use only.
No. 25,000 RPM is the maximum rated speed. Never exceed the RPM rating of the lowest-rated component in the disc, holder, and tool assembly.
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