Grit size refers to the particle size of abrasive materials used in sandpaper, grinding wheels, and other abrasive tools. The grit size is usually represented by a number, and each number corresponds to a specific size range of abrasive particles per square inch. The higher the grit number, the finer the abrasive particles.
For example, a grit size of 36 means that the abrasive particles are coarse and can pass through a sieve with 36 openings per linear inch.
Conversely, a grit size of 1000 indicates that the particles are much finer and can pass through a sieve with 1000 openings per linear inch.
In general, higher grit numbers correspond to smaller particle sizes, resulting in finer abrasives. The actual density of abrasive particles per square inch can vary depending on factors such as the material and the manufacturing process, but the grit number primarily denotes the size of the particles rather than their density.
The grit progression typically involves starting with a coarse grit to remove material quickly, followed by progressively finer grits to refine the surface and achieve the desired level of smoothness. The finer grits are often used for finishing work, where a polished or smooth surface is required.
It’s essential to follow a logical sequence of grits to achieve the best results and avoid skipping too many grits, as this can result in inefficient sanding and potential damage to the material.
For example, a grit size of 36 means that the abrasive particles are coarse and can pass through a sieve with 36 openings per linear inch.
Conversely, a grit size of 1000 indicates that the particles are much finer and can pass through a sieve with 1000 openings per linear inch.
In general, higher grit numbers correspond to smaller particle sizes, resulting in finer abrasives. The actual density of abrasive particles per square inch can vary depending on factors such as the material and the manufacturing process, but the grit number primarily denotes the size of the particles rather than their density.
The grit progression typically involves starting with a coarse grit to remove material quickly, followed by progressively finer grits to refine the surface and achieve the desired level of smoothness. The finer grits are often used for finishing work, where a polished or smooth surface is required.
It’s essential to follow a logical sequence of grits to achieve the best results and avoid skipping too many grits, as this can result in inefficient sanding and potential damage to the material.
Grit Sizes Explained
See a breakdown of the most common grit sizes and their general applications below:
Course Grit - P36, P40, P60, P80
Used for rapid material removal and shaping. Suitable for tasks such as removing paint, rust, or rough shaping of wood or metal.
Medium Grit - P100, P120, P150
Suitable for general-purpose sanding and smoothing. Effective for removing scratches left by coarse grits and preparing surfaces for finer grits.
Fine Grit - P180, P220, P240, P280, P320
Used for finer sanding and smoothing of surfaces. Ideal for preparing surfaces for finishing, such as painting or staining.
Very Fine Grit - P360, P400, P500, P600
Used for finishing work and preparing surfaces for polishing. Suitable for achieving a smooth surface before applying a finish.
Extra Fine Grit - P800, P1000, P1500, P2000, P3000, P4000
Used for fine finishing, polishing, and achieving a high level of smoothness. Commonly employed in woodworking, metalworking, and automotive finishing.
We offer a huge range of sia Abrasive products in a wide variety of grit sizes. If you’re looking for a particular grit number, simply select the desired ‘Grit’ from our shop’s filters.
See sia Abrasives grit coating method here: https://www.siaabrasives.com/en-gb/expertise/types-of-abrasives/coated-abrasives/grit-coating-method/
