本标准的目的是建立 国家认可的检查基础 用于制造的磨粒尺寸 砂轮、一般抛光和抛光 其他一般工业用途，如压力 喷砂、石板颗粒化等）计划 作为理解的共同基础 适用于磨粒生产商和 这些产品的制造商、分销商和用户 研磨产品。本标准规定了 粒度名称、粒度限制和 用于测定它们的筛子，以及 行业用于测试的测试程序 检查磨粒的大小。磨料 谷物是一种天然或人造物质 通过粉碎到特定粒度来减少， 然后被制成可供使用的产品 用于通过研磨去除异物， 抛光、研磨等。一些 天然材料是刚玉，金刚砂， 石榴石；人造材料是熔合的 氧化铝和碳化硅。

The purpose of this standard is to establish a nationally recognized basis for checking the size of abrasive grain for use in the manufacture of grinding wheels, general polishing and other general industrial uses such as pressure blasting, lithoplate graining, etc.) It is intended to serve as a common basis of understanding for abrasive grain producers, and for the manufacturers, distributors, and users of these abrasive products. This standard sets forth the grit size designations, the size limits and the sieves used in determining them, as well as the test procedure which is used by the industry for checking the size of abrasive grain. Abrasive grain is a natural or manufactured substance that is reduced by crushing to specific grit sizes, and is then made into products which are used for removing extraneous material by grinding, polishing, lapping, etc. Examples of some of the natural materials are corundum, emery, and garnet; manufactured materials are fused aluminum oxide and silicon carbide.