ISO 7092

Abstract

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.<br>Washers of hardness class 200 HV are suitable for<br>- cheese head screws in property classes up to and including 8.8, or made of stainless steel;<br>- hexagon socket head cap screws in property classes up to and including 8.8, or made of stainless steel;<br>- hexalobular socket head cap screws in property classes up to and including 8.8, or made of stainless steel; <br>- case-hardened thread rolling screws with cheese heads.<br>Washers of hardness class 300 HV are suitable for<br>- hexagon socket head cap screws in property classes up to and including 10.9;<br>- hexalobular socket head cap screws in property classes up to and including 10.9.<br>If dimensions other than those listed in this International Standard are required, they should be selected from those given in ISO 887.<br>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.