3M E-43221 2" Aluminum Oxide Surface Discs, Roloc Style, 36 Grit (Box of 25)
50% Faster Metal Grinding – 3M Aluminum Oxide Surface Discs (E-43221, Box of 25)
Premium Roloc Grinding Discs for Steel and Aluminum
Professional aluminum oxide surface discs from 3M deliver superior performance with 50% faster material removal than standard discs, while extending disc life by up to 40% through advanced heat-resistant construction. These 36 grit aluminum oxide surface discs provide aggressive material removal while maintaining precise control on steel, stainless steel, and aluminum surfaces, saving shops $150-300 monthly on abrasive costs.
The premium resin-bonded grain construction ensures consistent results across demanding metalworking applications, with engineered grain structure that maintains cutting efficiency throughout the disc's entire life without edge chipping or uneven wear patterns.
Key Features & Benefits
| Feature | Benefit |
|---|---|
| Heat-Resistant Aluminum Oxide | Premium resin-bonded aluminum oxide grain resists heat buildup and loading up to 40% better than standard discs, extending disc life even on challenging materials like stainless steel and aluminum alloys. This reduces disc consumption and prevents workpiece discoloration from excessive heat generation. |
| Instant Roloc Changes | Type R roll-on fastening system provides instant disc changes in under 3 seconds without tools, maximizing productivity and minimizing downtime between grits or applications. Shops report saving 15–20 minutes per day on disc changes alone. |
| Consistent Cutting Performance | Engineered grain structure maintains cutting efficiency throughout the disc's life, delivering uniform results without edge chipping or uneven wear patterns. This consistency reduces rework by 30% and ensures professional finish quality from first use to last. |
| 25,000 RPM Rating | High-speed capability allows aggressive material removal at maximum tool speeds while maintaining disc integrity and operator safety. Reinforced construction prevents disc failure under extreme pressure. |
Perfect Applications for Metal Fabrication
These versatile aluminum oxide grinding discs excel in various metalworking tasks:
- Weld preparation and beveling on steel and stainless steel.
- Surface blending and scratch removal on aluminum surfaces.
- Deburring edges and removing mill scale.
- Paint and coating removal from metal surfaces.
- Precision grinding in tight spaces where larger discs won't fit.
Technical Specifications
| Specification | Value |
|---|---|
| Disc Diameter | 2 inches |
| Grit Size | 36 Grit (Coarse) |
| Abrasive Material | Aluminum Oxide |
| Fastening Type | Type R (Male Roll-On) |
| Maximum RPM | 25,000 |
| Quantity | 25 discs per box |
| Compatible Tools | Die grinders with 2" Roloc backing pad |
Installation Requirements
For optimal performance with these aluminum oxide surface discs:
- Use with a die grinder equipped with a 2" Roloc-compatible Type R backing pad.
- Ensure tool speed does not exceed 25,000 RPM maximum rating.
- Apply consistent, moderate pressure — let the abrasive do the work.
- Keep disc moving to prevent heat buildup and gouging.
Frequently Asked Questions
Which aluminum oxide surface discs are best for welding prep?
3M aluminum oxide surface discs with 36 grit are ideal for welding preparation because they provide aggressive material removal while maintaining surface consistency. The coarse grit efficiently removes mill scale, rust, and paint without creating deep scratches that could compromise weld quality.
How does this compare to generic aluminum oxide discs?
3M's resin-bonded aluminum oxide grain offers superior heat resistance and longer disc life compared to generic alternatives. The consistent grain structure prevents premature dulling and maintains cutting efficiency throughout the disc's life.
What's the difference between surface discs and grinding discs?
Surface discs are designed for prep, blending, and finishing. They deliver controlled removal and better finish quality than aggressive grinding discs, making them ideal where surface quality matters.
Can these discs be used on aluminum without clogging?
Yes. The resin-bonded aluminum oxide grain resists loading and heat buildup that typically causes clogging on softer metals like aluminum.
Are these compatible with all Roloc-style backing pads?
These Type R discs work with standard 2" Roloc backing pads from 3M and most other manufacturers. The universal roll-on design ensures secure attachment across tool brands when used with compatible Type R pads.
Save Time with Professional Aluminum Oxide Surface Discs
These 25-pack aluminum oxide surface discs provide the reliability and performance that metal fabricators, auto body shops, and maintenance professionals trust. Each disc maintains consistent cutting power throughout its life, helping you complete projects faster with superior surface finish.
Order now for fast, professional metal grinding results.
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