Sanding Belt Grits Explained: Which Grit to Use and When
By Red Label Abrasives | Published: 2026-10-15
Category: How-to Guides
A practical sanding belt grit guide: what each grit range does, the right sanding grit sequence, and how to pick belts for wood and metal without guesswork.
Quick answer
Start coarse enough to remove the damage or mill marks in one pass, then step through a logical sanding grit sequence, typically doubling the grit number each time (for example 80, 120, 180, 220). For heavy stock removal on metal, choose 36–80 grit; for general wood prep, 80–120; for finishing, 150–220; for between-coat or polish prep, 320 and finer. The right grit is the one that removes the previous scratch pattern, not the one that feels safest.
What the grit number actually tells you
Grit is a measure of abrasive particle size, not a promise of finish quality. Lower numbers mean larger, more aggressive grains that cut deep and fast; higher numbers mean smaller grains that refine the surface. A 36 grit belt can hog off material but leaves deep scratches, while a 220 grit belt smooths those scratches but removes almost nothing. Think of each grit as a tool for a specific job, not a ranking of better or worse.
A practical sanding grit sequence for wood and metal
For wood, a common sequence is 80 → 120 → 180 → 220. If you are working with rough lumber or removing planer marks, start at 60 or 80. If you are sanding between coats of finish, 320 or 400 is more appropriate. For metal, start with 36–80 for heavy grinding, then step to 120, 180, and 220 if you need a paintable or polishable surface. The key is not to skip more than one grit step; jumping from 80 to 220 leaves scratches that are hard to remove later.
Coarse vs fine sanding belts: when to switch
Switch to a finer belt when the scratches from the previous grit are gone. If you are still seeing swirl marks or deep lines, go back one step. Coarse belts are for shaping and rapid removal; fine belts are for surface refinement. Spending too long with a coarse belt can dish out a surface or round over edges, while starting too fine wastes time and belts because the abrasive glazes over before it cuts.
How to read a sanding belt grit chart without overthinking it
A sanding belt grit chart groups grits by purpose: 24–60 for extra coarse stock removal, 80–120 for medium prep, 150–220 for fine finishing, 240–400 for very fine, and 600+ for polishing. Use the chart as a starting point, then adjust based on your material and machine. For example, a 2x42 belt on a small grinder will behave differently than a 3x132 belt on a large machine, so let the scratch pattern guide you.
Grit questions we hear most
- Can I skip a grit when sanding?
- Skipping more than one grit step usually leaves scratches from the previous belt that the finer belt cannot remove efficiently. If you must skip, expect to spend more time with the finer belt and check the surface under raking light. For best results, step through each grit in sequence, especially when finishing.
- How do I know when to change to the next grit?
- Change when the scratch pattern from the current grit is uniform and the previous grit's scratches are gone. If you see shiny spots or deep lines, keep sanding with the current grit or go back one step. Inspect with a bright light at a low angle; it reveals scratches that feel smooth.
- What grit should I start with for unknown material?
- Start with 80 grit on a test area. If it cuts too slowly, drop to 60 or 40; if it cuts too aggressively or clogs quickly, move to 120. Let the belt's performance and the surface tell you which direction to go. Always test on scrap or a hidden area before committing to a full sequence.
Belts that match common grit jobs
- 2 X 42 PRIZMA Structured Grain Aluminum Oxide X-wgt Sanding Belts - 4 PK: PRIZMA structured grain aluminum oxide X-wgt sanding belts are available in grits up to 1000G and designed for dry applications, with a triangular cone-shaped abrasive that continually exposes new surfaces. This makes them a good choice when you need consistent fine finishing and want to eliminate belt bump in extra fine grits, especially for final sanding steps where a uniform scratch pattern matters.
- 3 X 132 Inch Premium Zirconia Sanding Belts, 4 Pack: 3x132 inch premium zirconia sanding belts are industrial grade and self-sharpening; zirconia grains extend belt life up to 2.5 times longer than aluminum oxide. For heavy grinding or coarse grit work on metal, this durability means fewer belt changes and less heat buildup from dull abrasive, which helps you stay in the coarse-to-medium grit range longer.
- 3 X 79 Inch EdgeCore Ceramic Sanding Belts, 4 Pack (PRO): 3x79 inch EdgeCore ceramic sanding belts are designed for high pressure grinding and cooler grinding temps, with ceramic micro-fracturing to reveal fresh grain. When you are stepping through coarse grits on hard steel or doing heavy stock removal, cooler cutting reduces the risk of burning the workpiece and helps maintain a consistent scratch pattern for the next grit.
