一系列英寸环（0.08英寸至6英寸），精度分为三级（AA、A和B）。几何形状精度、平均测量尺寸与标称尺寸的最大偏差、测量尺寸的确定精度。还包括材料、硬度和表面纹理。交叉引用:BS 1044BS 1134BS 3730

A range of inch rings (0.08 in to 6 in) in three grades of accuracy (AA, A and B). Accuracy of geometric form, maximum departures of mean measured size from nominal size, accuracy to which the measured size is to be determined. Also includes material, hardness, and surface texture.Cross References:BS 1044BS 1134BS 3730