规定了由厚度范围为0.003 mm至0.35 mm的磁性软钢或合金条缠绕而成的环形磁芯的尺寸和结构特征。确定主要尺寸的标准范围，并就带钢厚度、芯部保护、标记和包装提供指导。交叉引用:BS 4727:第1部分:07IEC 205IEC 525组

Specifies dimensional and constructional characteristics for toroidal cores wound from strips of magnetically soft steel or alloy over the thickness range 0.003 mm to 0.35 mm. Establishes standard ranges of main dimensions and gives guidance on strip thickness, core protection, marking and packing.Cross References:BS 4727:Part 1:Group 07IEC 205IEC 525