標準號：SIS SS-ISO 7091-1988
中文標準名稱：平墊圈．常規系列．產品C級
英文標準名稱：Plain washers — Normal series — Product grade C
發布日期：1988/11/15 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：This International Standard lays down the specification for plain washers of product grade C, Preferable for hexagon bolts, screws and nuts of product grades C with normal ac-ross flats according to ISO 272, with thread sizes from M5 to M36 inclusive.When soft material pieces are tightened, or large clearance holes are used, the user shall check the technical suitability of this standard washer.