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Sanding belts by grit, grain, backing and belt length

A sanding belt keeps a continuous abrasive surface moving in one direction, which is why belt sanders strip stock faster and leave a straighter scratch pattern than an orbital tool. Fit is exact: the belt has to match the machine's width and circumference, so check both figures and the joint direction arrow before ordering. Grit sequence does the real work. Coarse grades take off paint, weld spatter and saw marks, medium grades true the surface, and fine grades prepare it for coating or polishing; skipping more than one grade leaves scratches the next belt cannot clear.

Grain follows the workpiece, with aluminium oxide for general timber and mild steel, zirconia for heavy stock removal under pressure, and ceramic for stainless and hard alloys where heat build-up would burn a cheaper abrasive. Cloth backings follow contours and survive edge work, while heavier backings stay flat on a bench machine. Narrow belts on a file sander reach weld seams and tube junctions nothing else gets to.

These sit within the sanding sharpening polishing and deburring range, next to sanding disc and mounted point abrasives.

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