ISO 7090-2000 倒角平垫圈 标准系列 产品等级A级

标准号：ISO 7090-2000
中文标准名称：倒角平垫圈 标准系列 产品等级A级
英文标准名称：Plain washers, chamfered - Normal series - Product grade A
标准类型：J13
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：J13
国际标准分类号：21.060.30
适用范围：This International Standard specifies the characteristics of normal-series, product-grade-A plain washers chamfered at the outside diameter, in the 200 HV and 300 HV hardness classes and of nominal sizes (nominal thread diameters) ranging from 5 mm to 64 mm inclusive. Washers of hardness class 200 HV are suitable for — bolts and screws of product grades A and B in property classes up to and including 8.8; — nuts of product grades A and B in property classes up to and including 8; — bolts, screws and nuts of stainless steel of similar chemical composition; — case-hardened thread rolling screws. Washers of hardness class 300 HV are suitable for — bolts and screws of product grades A and B in property classes up to and including 10.9; — nuts of product grades A and B in property classes up to and including 10. 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.