This International Standard specifies 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 1,6 mm to 36 mm inclusive.
Washers of hardness class 200 HV are suitable for
cheese head screws in property classes up to and including 8.8, or made of stainless steel;
hexagon socket head cap screws in property classes up to and including 8.8, or made of stainless steel;
hexalobular socket head cap screws in property classes up to and including 8.8, or made of stainless steel;
case-hardened thread rolling screws with cheese heads.
Washers of hardness class 300 HV are suitable for
hexagon socket head cap screws in property classes up to and including 10.9;
hexalobular socket head cap screws in property classes up to and including 10.9.
If dimensions other than those listed in this International Standard are required, they should be selected from those
given in ISO 887.
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.
Festgelegt sind die Eigenschaften für flache Scheiben, kleine Reihe, Produktklasse A, mit den Härteklassen 200 HV und 300 HV. Die Festlegungen gelten für Nenngrößen (Gewinde-Nenndurchmesser) von 1,6 mm bis 36 mm. Enthalten sind die Toleranzbereiche für den Loch- und den Außendurchmesser sowie für die Dicke. Weiters sind die technischen Lieferbedingungen festgelegt. Werte für die Oberflächenrauheit sind angegeben. Ein Bezeichnungsbeispiel ist angeführt.