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Which Grit Should I Use?

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When it comes to sanding discs, one of the crucial factors to consider is the grit size. The grit size determines the coarseness or fineness of the abrasive particles on the sanding disc’s surface. Choosing the appropriate grit size for your sanding project is essential to achieve the desired outcome. Here is a closer look at the significance of grit size and its applications:

1 Understanding Grit Size:

Grit size is represented by a number, which indicates the number of abrasive particles per square inch on the sanding disc. Lower grit numbers, such as 40 or 60, have larger abrasive particles, making them suitable for aggressive material removal. Higher grit numbers, like 220 or 320, have finer particles, offering a smoother finish.

2 Coarse Grits (40 to 80):

Coarse grit sanding discs are ideal for heavy-duty sanding and material removal tasks. They are commonly used to strip paint or varnish from wood surfaces, remove rust or corrosion from metal, or level uneven surfaces. Coarse grits work efficiently on rough or heavily damaged surfaces, but they may leave visible scratches that require additional sanding with finer grits.

3 Medium Grits (100 to 180):

 Medium-grit sanding discs strike a balance between material removal and surface refinement. They are versatile and commonly used for smoothing out rough wood, preparing surfaces for painting or staining, or removing light imperfections. Medium grits are often employed in woodworking, metalworking, and automotive applications.

4 Fine Grits (220 to 400):

Fine-grit sanding discs are primarily used for achieving a smooth and polished finish. They are suitable for sanding between coats of paint or varnish, removing small blemishes or scratches, and preparing surfaces for final finishes. Fine grits are commonly used in woodworking, furniture refinishing, and intricate craft projects.

5 Extra Fine Grits (600 and above):

 Extra-fine grit sanding discs are designed for delicate surfaces and final finishing. They are ideal for achieving a mirror-like finish on wood, polishing metals, or preparing surfaces for high-gloss finishes. Extra-fine grits are often used in fine woodworking, instrument-making, and speciality applications.

6 Multiple Grits

Some sanding discs are available with multiple grits, allowing for progressive sanding. These discs feature different grit sizes arranged in concentric rings or segments, enabling users to transition seamlessly from coarse grits to finer grits as they work towards a refined finish.


Remember that the specific grit size you choose will depend on the material you’re sanding, the level of imperfections you need to address, and the desired outcome. It’s often a good practice to start with a coarser grit and gradually progress to finer grits for optimal results. Experimentation and practice will help you develop an understanding of which grit sizes work best for different sanding tasks.

Additionally, it’s important to consider the speed and pressure applied during sanding, as they can affect the effectiveness and lifespan of the sanding disc. Adhering to manufacturer guidelines and using appropriate techniques will ensure that you achieve the desired results while maintaining the longevity of your sanding discs.

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