ISO 13921:2008
航空航天系列.强度等级小于或等于1100 MPa、金属材料制的、有涂覆或未涂覆、标称杆、短和中等长度MJ螺纹、内部偏移十字形肋状或非肋状驱动的100°异径埋头螺钉.尺寸
Aerospace - Screws, 100 degrees reduced countersunk head, internal offset cruciform ribbed or unribbed drive, normal shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1100 MPa - Dimensi