Built for demanding grinding and fabrication work, this 4" T27 zirconia flap disc combines aggressive stock removal with the control needed for blending, deburring, and surface preparation. The self-sharpening zirconia grain continually exposes fresh cutting edges as the flaps wear, helping maintain strong cutting performance under the heat and pressure of metal grinding.
The flat T27 profile is especially well suited for shaped and non-flat workpieces such as fence posts, gates, risers, tubing, edges, and fabricated assemblies. Its overlapping flap construction allows one disc to grind, blend, and progressively refine the surface, making it a versatile alternative to switching between separate grinding and finishing abrasives.
Benchmark Abrasives flap discs are manufactured on computer-controlled equipment for consistent flap placement and construction, and this disc contains 25–50% more abrasive material than competing standard flap discs. That added abrasive content gives the user more usable grinding material throughout the life of the disc while maintaining the flexibility and surface control that make flap discs so effective.
Quantity: 1 Piece
Product Specifications
Specification
Details
Outer Diameter
4"
Inner Diameter
5/8"
Shape
T27 Flat Face
Density
Regular Density
Abrasive Grain
Zirconia
Available Grits
40, 60, 80, 120
Abrasive Backing
X-weight polycotton cloth
Max RPM
13,300
Use
Dry Only
Product Features
Premium zirconia abrasive for aggressive grinding and long-lasting cutting performance
Self-sharpening grain continually exposes fresh cutting edges as the disc wears
25–50% more abrasive material than competing standard flap discs
Overlapping flap construction combines grinding, blending, and surface refinement
Regular-density construction provides controlled material removal
T27 flat face is well suited for shaped and non-flat surfaces
X-weight polycotton cloth backing provides strong abrasive support
Materials & Applications
Best For:
Carbon steel
Structural steel
Stainless steel
Cast iron
Additional Materials:
Titanium
Nickel
Wrought iron
Copper
Fiberglass
Plastic
Hard rubber
Wood
Stone
Common Applications:
Grinding and blending welds on shaped or non-flat surfaces
Fence posts, gates, risers, tubing, and fabricated assemblies
Deburring and edge cleanup
Stock removal
Removing surface imperfections
Surface preparation
General fabrication, maintenance, and repair work
Machine Compatibility
Designed for 4" angle grinders using a compatible 5/8" mounting system.
Always verify that the grinder is approved for the disc diameter and mounting style, that the proper guard and mounting hardware are installed, and that the grinder's operating speed does not exceed the flap disc's 13,300 RPM maximum.
Safety Tips
Inspect the flap disc before use and do not use a damaged disc.
Never exceed the maximum rated speed of 13,300 RPM.
Use the proper grinder guard and compatible mounting hardware.
Built for demanding grinding and fabrication work, this 4" T27 zirconia flap disc combines aggressive stock removal with the control needed for blending, deburring, and surface preparation. The self-sharpening zirconia grain continually exposes fresh cutting edges as the flaps wear, helping maintain strong cutting performance under the heat and pressure of metal grinding.
The flat T27 profile is especially well suited for shaped and non-flat workpieces such as fence posts, gates, risers, tubing, edges, and fabricated assemblies. Its overlapping flap construction allows one disc to grind, blend, and progressively refine the surface, making it a versatile alternative to switching between separate grinding and finishing abrasives.
Benchmark Abrasives flap discs are manufactured on computer-controlled equipment for consistent flap placement and construction, and this disc contains 25–50% more abrasive material than competing standard flap discs. That added abrasive content gives the user more usable grinding material throughout the life of the disc while maintaining the flexibility and surface control that make flap discs so effective.
Quantity: 1 Piece
Product Specifications
Specification
Details
Outer Diameter
4"
Inner Diameter
5/8"
Shape
T27 Flat Face
Density
Regular Density
Abrasive Grain
Zirconia
Available Grits
40, 60, 80, 120
Abrasive Backing
X-weight polycotton cloth
Max RPM
13,300
Use
Dry Only
Product Features
Premium zirconia abrasive for aggressive grinding and long-lasting cutting performance
Self-sharpening grain continually exposes fresh cutting edges as the disc wears
25–50% more abrasive material than competing standard flap discs
Overlapping flap construction combines grinding, blending, and surface refinement
Regular-density construction provides controlled material removal
T27 flat face is well suited for shaped and non-flat surfaces
X-weight polycotton cloth backing provides strong abrasive support
Materials & Applications
Best For:
Carbon steel
Structural steel
Stainless steel
Cast iron
Additional Materials:
Titanium
Nickel
Wrought iron
Copper
Fiberglass
Plastic
Hard rubber
Wood
Stone
Common Applications:
Grinding and blending welds on shaped or non-flat surfaces
Fence posts, gates, risers, tubing, and fabricated assemblies
Deburring and edge cleanup
Stock removal
Removing surface imperfections
Surface preparation
General fabrication, maintenance, and repair work
Machine Compatibility
Designed for 4" angle grinders using a compatible 5/8" mounting system.
Always verify that the grinder is approved for the disc diameter and mounting style, that the proper guard and mounting hardware are installed, and that the grinder's operating speed does not exceed the flap disc's 13,300 RPM maximum.
Safety Tips
Inspect the flap disc before use and do not use a damaged disc.
Never exceed the maximum rated speed of 13,300 RPM.
Use the proper grinder guard and compatible mounting hardware.
Secure the workpiece and maintain control of the grinder throughout use.
Use only on grinders approved for the disc diameter and mounting configuration.
Dry use only.
Frequently Asked Questions
T27 flap discs have a flat face and are preferred by many users when grinding shaped or non-flat surfaces such as fence posts, gates, risers, tubing, edges, and similar fabricated components.
A T27 flap disc has a flat face and is generally preferred for shaped and non-flat surfaces. A T29 flap disc has an angled face that ergonomically approaches flat surfaces better, making T29 the preferred choice for flat grinding applications such as grinding down bead welds.
Zirconia is a durable, self-sharpening abrasive that performs well under the heat and pressure generated during metal grinding. It is especially useful for heavier stock removal and demanding fabrication work.
Yes. The overlapping abrasive flaps wear gradually and continually expose fresh zirconia grain, allowing the disc to remove material while progressively blending the work surface.
No. This is a regular-density flap disc. High Density, also called Jumbo, flap discs use more flaps and have a thicker overall construction than regular-density flap discs.
Dry use only.
The Makita GA4030 is one example when it is fitted with its correct 5/8" centering flange, 4" guard, and retaining hardware. A 5/8" plain bore is not the same as a 5/8"-11 threaded hub, so verify the complete mounting system before use.
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