Fasteners 紧固件 Produ ct grade F 产品等级F DIN 267 Part 6 第6 部分 Mechanische Verbindungselemente; technische Lieferbedingungen, Ausführungen und Maßgenauigkeit für Produktklasse F 产品等级F 紧固件；发货技术条件；设计和尺寸精确度 In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker. 为了与国际标准组织（ISO）的现行标准条例相符，使用逗号作十进制标记。 Dimensions in mm 尺寸单位毫米 1 Scope and field of application 1 适用范围和领域 This standard specifies tolerances for product grade F screws, bolts and nuts with thread diameters from 1 to 3 mm. 本标准详细说明了产品等级F 的螺纹直径为1-3 毫米的螺丝、螺钉和螺母的公差。 It is recommended that this standard should also be used for non-standardized fasteners. 本标准同样适用于非标准化的紧固件。 Product grade F generally refers to the quality of products for which stringent requirements are made with respect to tolerances (e.g. in precision mechanics). 产品等级F 泛指根据产品质量所制定的严格公差要求（如在精确的技工中）。 2 Thread diameters 2 螺纹直径 Table 1 表1 Thread diameter 螺纹直径 Tolerance 1) 公差1) Internal thread 内螺纹 (nuts) (螺母） External thread 外螺纹 (bo1ts and screws) (螺钉和螺丝） ≥ 1 ≤ 1.4 5H 4h >1.4 ≤ 3 6H 6g 1) Plated threads shall not infringe the maximum material limit with zero fundamental deviation. 1）电镀螺纹不得违反零度基本偏差的最大材料限制。 3 Thread lengths 3 螺纹长度 P = pitch of thread P=螺距 4 Nominal lengths 4 公称长度 Continued on pages 2 to 5. 详见第 2 页到第 5 页。 5 Driving geometry 5 驱动几何体 5.1 Widths across flats and widths across corners 5.1 平面的宽度和角度的宽度 The specified tolerances for widths across flats and the minimum w...
