The characteristics of small-series, product-grade-A plain washers in the 200 HV and 300 HV hardness classes and of nominal sizes (nominal thread diameters) ranging from 1.6mm to 36mm inclusive. Suitability of washer of hardness classes are given. When soft material pieces are clamped, or large clearance holes in the workpiece are used, the user should check the technical suitability of this type of washer. If dimensions other than those listed in this International Standard are required, they should be selected from those given in ISO 887.