標準號：BS EN ISO 7089-2000
中文標準名稱：平墊圈.標準系列.產品等級A級
英文標準名稱：Plain washers. Normal series. Product grade A
標準類型：J13
發布日期：2000/9/15 12:00:00
實施日期：2000/9/15 12:00:00
中國標準分類號：J13
國際標準分類號：21.060.30
適用范圍：This International Standard specifies the characteristics of normal-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 64 mm inclusive. Washers of hardness class 200 HV are suitable for — hexagon bolts and screws of product grades A and B in property classes up to and including 8.8; — hexagon nuts of product grades A and B in property classes up to and including 8; — hexagon 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 — hexagon bolts and screws of product grades A and B in property classes up to and including 10.9; — hexagon 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.