JIS T5406:1979 pdfダウンロード。Dental Scalers 1.Scope This Japanese Industrial Standard specifies scalers for use in dentistry,hereinafter referred to as the “scalers”. 2Performance 2.1Hardness When a test is performed by the testing method of 7.3，thehardness of the end part shall be not lower than 600 in Vickers hardness (Hv). 2.2PlatingThe plated coating shall conform to the plating grade 3 of class1 or class 2 for iron and steel specified in JIS H 8617 or be superior thereto inquality. 3.Construction 3.1Joint The joint between.the handle section and the working part shallprovide a perfect connection by welding. 4. Dimensions The dimensions of scalers shall...