wd900英译.doc

FORD WORLDWIDE FASTENER STANDARD 紧固件国际标准 日期：1996-10-01 WS 900 General Specifications for Spaced Thread Tapping Screws 间隔螺纹自攻螺钉总规范 1. SCOPE. 1.范围 This standard specifies the general and dimensional requirements for spaced thread tapping screws with various head forms. 本标准规定了各种头部结构的间隔螺纹自攻螺钉总要求和尺寸 2. REFERENCES. 2.引用 ISO 1478 -Tapping Screws Thread WD 950 -Material and Performance requirements for Carbon Steel Tapping Screws ISO 1478 自攻螺钉螺纹 WD 950 碳钢自攻螺纹材质和性能要求 3. GENERAL REQUIREMENTS. 3. 总要求 3.1 DIMENSIONS AND TOLERANCES. The dimensions and tolerances of Pan Head, Round Washer Head, Raised Countersunk Head, Flat Countersunk Head, Hexagon Head and Flanged Hexagon Head Spaced Thread Tapping screws must be in accordance with Tables 1 thru 6, Figures 1 thru 5 included in Clauses 2 thru 7, and Appendices A, B and C as appropriate. 3.1. 尺寸和公差：大柱头、圆垫圈头、凸面??头、平面埋头、六角和凸缘六角间隔螺纹自攻螺钉必须符合表1至表6，第2条至第7条中的图1至图2及附录A，B和C的相应部分。 3.2 SCREW THREADS. 3.2 螺钉螺纹 3.2.1 THREAD LENGTH. For types AB and B screws of nominal lengths equal to 8 diameter or 38mm, whichever is shorter, the full form threads shall extend close to the head such that the specified minor diameter limits are maintained to within one pitch maximum from the underside of head. Screws of longer nominal lengths shall have a minimum length of full form thread equal to 6 diameters or 38mm, whichever is shorter. 3.2.1 螺纹长度 对于公称长度等于8倍直径或38mmAB和B型螺钉，无论哪个更短，成形螺纹应延伸靠近头部，以便离头部内侧最远处使规定最小直径保持在1个螺距之内。公称长度更长的螺钉，无论哪个更短，成形螺纹长度最小应等于6倍直径或38mm。 3.2.2 SCREW LENGTH. The length of the screw shall be measured parallel to the axis of the screw from the largest diameter of the bearing surface of the head to the extreme point. The tolerance on length shall be as specified in Table 1 with minimum practical screw lengths as shown in Table 1a. 3.2.2 螺钉长度 应平行于螺钉轴线，测量从头部承载面最大直径处到终端的距离。表1规定了长度公差，表1a中列出了最小应用螺钉。 Table 1. Tolerance on length 表1 长度公差 Screw Type 螺钉类型Nominal Screw Length 螺钉公称长度Tolerance on 公差ABUp to 25mm inclusive 小于等于25+/- 0.8