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date: 04 August 2020


A Dictionary of Mechanical Engineering

Marcel Escudier,

Tony Atkins

The differently sized grits of hard materials such as emery employed for grinding, polishing, etc. The abrasive grade is determined by the grit size (grit number) originally related to the hole sizes in wire sieves. Higher numbers indicate smaller abrasive particles and hence finer finishes and, in the FEPA (Fédération Européenne des Fabricants de Produits Abrasifs) standards, include number 16 (1.0~1.4 mm) designated ‘coarse’; 46 (0.3~0.4 mm), medium; 90 (0.13~0.18 mm), fine; and 600 (0.008~0.010 mm), very fine.... ...

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