JIS B4120:1985 pdfダウンロード。lndexable Inserts for Cutting Tools-Designation 1.Scope This Japanese Industrial Standard specifies a code of symbolization for the designation of indexable throw-away inserts in materials suchas cemented carbide，cermet and ceramics for cutting tools，hereinafterreferred to as the “inserts”. 2.Definition For the purpose of this standard , the following definitionsapply : basic inscribed circle ( d )An inscribed circle taken as thebasis to define the height of corner and the size of insertsand having the diameter equal to the basic size. (2)normal clearance angle ( en ) The normal clearance angle shall be as follows. ( 3)height of corner (m) The...