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Abrasive fiber disc, 4-1/2 inch diameter, 50 grit, dark brown surface with center hole

Ali Indistries Inc

Ali Industries Inc 3072 Abrasive Fiber Disc 4-1/2" 50 Grit

SKU CH-14X8-PEV48

4-1/2" 50-grit aluminum oxide fiber disc for light removal, surface cleaning and finishing on angle grinders up to 20,000 rpm

  • TypeGrinders
  • Heavy-duty aluminum oxide resin fiber disc built for demanding grinding tasks
  • 50 grit abrasive removes material quickly while leaving a smooth surface ready for finishing
  • 4-1/2 inch diameter fits standard angle grinders used in metal fabrication
  • 7/8 inch arbor size matches common backer pads for secure, vibration-free mounting
  • Rated for 20,000 rpm maximum speed to handle high-speed grinding operations safely

Abrasive Fiber Disc for Angle Grinders

This 4-1/2 inch disc fits standard angle grinders with a 7/8 inch arbor. It is designed for light material removal, surface cleaning, finishing, and general-purpose sanding tasks. The heavy-duty aluminum oxide resin fiber construction suits both professional and DIY metalworking applications. Buyers needing aggressive stock removal or finer polishing grits should select a different disc specification.

50 Grit Capacity and Headroom

The coarse 50 grit rating handles weld blending, rust removal, and edge chamfering efficiently on steel and ferrous metals. It cuts quickly but leaves a visible scratch pattern requiring finer steps for a smooth finish. The disc reaches its limit on hardened alloys or when a polished surface is the immediate goal. Maximum operating speed is rated at 20,000 rpm for safe high-speed use.

Resin Fiber Build and Mounting

Heavy-duty resin bonding holds the aluminum oxide grain securely during high-speed grinding operations. The 7/8 inch centre hole mounts directly onto compatible backer pads without adapters. The 4-1/2 inch diameter matches common grinder guards for straightforward installation. Disc life depends on pressure control and workpiece material hardness during daily use.

Highlights

  • Heavy-duty aluminum oxide resin fiber disc built for demanding grinding tasks
  • 50 grit abrasive removes material quickly while leaving a smooth surface ready for finishing
  • 4-1/2 inch diameter fits standard angle grinders used in metal fabrication
  • 7/8 inch arbor size matches common backer pads for secure, vibration-free mounting
  • Rated for 20,000 rpm maximum speed to handle high-speed grinding operations safely

Specifications

TypeGrinders
BrandAli Ind.

Questions about this item

Will the 7/8" arbor on this 50 Grit disc fit the backer pad I already use on my angle grinder?

The disc has a 7/8" arbor, which is the standard size for most 4-1/2" angle grinder backer pads, so it will fit if your existing pad matches that dimension.

How can I confirm the disc is running safely at full speed once installed?

Run the angle grinder up to its maximum 20,000 rpm; the disc should spin smoothly without vibration or wobble, indicating it is seated correctly on the backer pad.

Does the box contain a backer pad or only the 3072 fiber discs?

Only the abrasive fiber discs are included; a compatible backer pad for 4-1/2" discs must be purchased separately.

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