Dynabrade 90339 Abrasive Belt 320 Grit Aluminum Oxide

Product Description

The DYNABRADE 90339 is a coated abrasive belt designed for precision surface finishing on portable belt sanding equipment. Measuring 3.5 inches wide by 15.5 inches long, it fits compact file belt sanders and finishing tools commonly used in metalworking, fabrication, and woodworking applications. The belt uses aluminum oxide abrasive grain on a cloth backing with X-weight construction, delivering the durability and flexibility needed for contour work and flat surface refinement. At 320 grit, it falls in the extra fine range, making it appropriate for final-pass finishing, light deburring, and pre-polish preparation on metal or wood substrates.

This belt is suited for trade and industrial environments where controlled surface finish is required. Fabricators, welders, pipefitters, and woodworking professionals use extra fine grit belts like this for finishing passes after coarser stock removal is complete. The 3.5 x 15.5 inch format is a common size for handheld pneumatic and electric file belt sanders used in tight spaces, weld seam finishing, and part deburring on the bench or in the field.

Key Features

• 320 grit aluminum oxide abrasive for extra fine surface finishing
• X-weight cloth backing provides flexibility and tear resistance during use
• Coated abrasive construction for consistent grain distribution across the belt surface
• 3.5 x 15.5 inch size fits compact file belt sanders common in fabrication and finishing work
• Suitable for metal, wood, and composite substrate finishing applications

Compatibility

Designed as a replacement abrasive belt for portable file belt sanders and finishing tools that accept 3.5 x 15.5 inch belts. Verify tool belt size specification before ordering.

Installation Notes

Belt replacement should be performed with the tool powered off and disconnected from its air supply or electrical source. Ensure the belt is seated fully on the platens and tracking is adjusted before resuming operation. Eye protection and appropriate respiratory PPE should be worn when performing abrasive finishing work. Follow the tool manufacturer guidelines for belt tension and tracking adjustment.