Benchmark Abrasives 4-1/2" x 7/8" type 29 surface conditioning flap discs combine the familiar working action of a flap disc with flexible nonwoven surface conditioning material for controlled cleaning, blending, light deburring, and finish refinement. Aluminum oxide abrasive is distributed through the open nonwoven flaps to refine weld areas, blend scratches, remove light surface oxidation, and produce a brushed or lightly grained finish without the aggressive stock removal of a conventional coated-abrasive flap disc.
The Type 29 angled face is well suited to working flat surfaces, including bead welds on plate and other broad workpieces. The angled profile gives the operator a more ergonomic approach to the surface while maintaining consistent contact across the working face. Available in Coarse, Medium, and a Blue finishing grade, these discs are especially useful on stainless steel and other ferrous and non-ferrous metals when the goal is surface refinement rather than heavy grinding.
Applications
- Cleaning and surface preparation
- Scratch blending
- Light deburring and deflashing
- Weld-area refinement
- Blending bead welds on flat surfaces
- Removing light oxidation and surface contamination
- Producing brushed or lightly grained finishes
- Refining stainless steel surfaces
- Preparing metal for subsequent finishing or polishing operations
Recommended Materials
- Cast iron
- Steel
- Stainless steel
- Titanium
- Nickel
- Wrought iron
- Super alloys
- Copper
- Brass
- Tin
- Aluminum
Type 29 Angled Face
The Type 29 angled face is the preferred Benchmark Abrasives flap-disc geometry for flat surfaces, including bead welds, plate, panels, and other broad workpieces. The angled profile allows the operator to approach the surface more naturally while keeping the working face engaged with the material.
For non-flat, shaped, or contoured workpieces such as fence posts, gates, risers, railings, and tubing, consider the Benchmark Abrasives Type 27 surface conditioning flap disc, whose flat face is better suited to maneuvering around changing geometry.
Performance
Surface conditioning flaps are designed for controlled cleaning, blending, light deburring, and finish refinement rather than heavy material removal. The layered flap construction provides a broad working surface while the flexible nonwoven material conforms to the workpiece and produces a brushed or lightly grained finish.
Select the grade according to the amount of cleaning and refinement required. Final appearance depends on the selected grade, starting surface, workpiece material, operating speed, pressure, and technique. For substantial weld or stock removal, use an appropriate grinding or coated abrasive first, then follow with the surface conditioning flap disc to refine the surface.
Machine Compatibility
Designed for compatible 4-1/2" angle grinders that accept 7/8" plain-bore flap discs using the proper flange, retaining nut, and approved guard.
For finishing performance, Benchmark Abrasives recommends operating these surface conditioning flap discs in the 4,000–5,000 RPM range. A variable-speed angle grinder capable of operating within this range is preferred.
The disc mounts directly with the grinder's compatible flange and retaining hardware. No separate backing pad is required.
Safety Tips
- Never exceed the disc's maximum speed of 13,300 RPM.
- For best finishing performance, operate within the recommended 4,000–5,000 RPM working range.
- Verify that the grinder, flange, retaining nut, guard, and disc are compatible before use.
- The 7/8" dimension is a plain arbor bore, not a threaded 5/8"-11 attachment.
- Inspect the disc for damage before mounting or use.
- Use the required grinder guard and side handle.
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- Use controlled pressure and allow the surface conditioning material to refine the workpiece.
- Follow the operating and safety instructions supplied with the grinder.
