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1、FORD WORLDWIDE FASTENER STANDARD 福特全球扣件标准日期: 1996-07-01WB 900 General and Dimensional Requirements of Pan Head, Raised Countersunk Head and Flat Countersunk Head Machine Screws, and Machine Screw and Tooth Washer Assemblies大柱头、凸面埋头和平面埋头机器螺钉及机器螺钉和齿状垫圈装配体总要求和尺寸1. SCOPE. This standard specifies the gen
2、eral and dimensional requirements of pan head, raised countersunk head and flat countersunk head machine screws and machine screw and machine screw and tooth lock washer assemblies with recess drive systems. Cross recess data is shown in Appendix A. Lobed recess data is shown in Appendix D. 1.范围：本标准
3、规范规定了大柱头、凸面埋头和平面埋头机器螺钉及带凹槽驱动系统的机器螺钉和齿状垫圈装配体的总要求和尺寸要求。附录A 为十字形凹槽数据，附录D 为叶状凹槽数据。2. REFERENCES. ISO 261 -ISO General purpose metric screw threads - General plan. ISO 965 -ISO General purpose metric screw threads - Tolerance. ISO 1502 -ISO General purpose metric screw threads - Gauging. ISO 4762 -Hexago
4、n socket head cap screws - Product grade A. ISO 7721 -Countersunk head screws - Head configuration and gauging. WA 900 -Dimensional requirements for hexagon and flanged hexagon bolts and screws, and hexagon screw and washer assemblies.WA 990 -Surface discontinuities of bolts and screws.2.引用1 ISO 261
5、 通用公制螺钉螺纹-总纲1 ISO 965 通用公制螺钉螺纹-公差1 ISO 1502通用公制螺钉螺纹-测量1 ISO 4762 A极六角座头螺钉1 ISO 7721 埋头螺钉-头部结构及测量1 WA 900 六角和凸缘六角螺栓、螺钉及六角螺钉与垫圈装配体的尺寸要求FORD WORLDWIDE FASTENER STANDARD 福特全球扣件标准日期: 1996-07-011 WA 990 螺栓和螺钉表面间隙3. GENERAL REQUIREMENTS. 3. 总要求3.1 DIMENSIONS AND TOLERANCES. The dimensions and tolerances of
6、 pan head, raised countersunk head and flat countersunk head machine screws, and machine screw and tooth lock washer assemblies shall be in accordance with Clauses 1 - 8, Tables 1 - 4 and Figures 1 - 4. 3.1 尺寸和公差：大柱头、凸面埋头和平面埋头机器螺钉及机器螺钉和齿状垫圈装配体的尺寸和公差应符合第1-8条，表1-4和图1-4。3.2 WASHERS. The dimensions, tol
7、erances and materials requirements of the washer component of machine screw and tooth lock washer assemblies shall be in accordance with WF 900. The washer shall be free to rotate while disassembly from the screw is prevented. 3.2. 垫圈 机器螺钉与齿状垫圈装配体的垫圈部件尺寸、公差及材质要求应符合WF 900。垫圈能够在螺钉上自由旋转但不能脱落。3.3 RECESS
8、ES. The dimensions and tolerances of recesses in pan head, raised countersunk head and flat countersunk head machine screws, and machine screw and tooth lock washer assemblies shall be in accordance with the requirements in Appendix A. 3.3 凹槽：大柱头、凸面埋头和平面埋头机器螺钉及机器螺钉和齿状垫圈装配体的凹槽尺寸和公差应符合附录A的要求。3.4 PILOT
9、 POINTS. The dimensions, tolerances and form and position tolerances of pilot points shall be as specified in WA 900. 3.4. 导向尖 WA 900规定了导向尖的尺寸、公差及公差种类和位置3.5 GAUGING. 3.5 测量3.5.1 COUNTERSUNK HEADS. For referee purposes the dimensions k and dk are satisfied if the heads of countersunk screws meet the
10、gauging requirements specified in Appendix B. 3.5.1 埋头螺钉头部 如果埋头螺钉头部满足B规定的测量要求，则可判定尺寸k和d kk合格。3.5.2 SCREW RING GAUGE. The screw ring gauge used in the determination of length of thread shall conform to the dimensions and tolerances defined in ISO 1502 appropriate to the specified thread and class of
11、fit. The full thread shall commence immediately at the gauge face. FORD WORLDWIDE FASTENER STANDARD 福特全球扣件标准日期: 1996-07-013.5.2 螺丝环规 确定螺纹长度的螺丝环规应符合ISO 1502 相应螺纹和装配等级规定的尺寸和公差。全螺纹起始于环规面。3.5.3 PENETRATION GAUGING. The method of penetration gauging, the gauge and the gauge point are defined in Appendix
12、A. 3.5.3 贯入测量 贯入测量方法、量规和量规尖部见附录A 规定。3.6 PROTECTIVE FINISH. All dimensions and tolerances defined in this specification apply prior to the application of the protective finish except where otherwise specified. 3.6. 表面处理 除非另有规定，任何表面处理之前，应符合本规范规定所有尺寸。4. LENGTH. 4.长度4.1 NORMAL LENGTH. The normal length
13、of a machine screw or a machine screw and tooth lock washer assembly is the distance from the bearing face or, in the case of countersunk screws, the theoretical junction of the countersunk face and the top of the head, to the furthest end of the threaded portion including any chamfer or radius but
14、excluding a special feature such as a dog point. The nominal length of a machine screw or machine screw and tooth lock washer assembly having a special feature such as a dog point, is the junction of the countersunk face and the top of the head, to the commencement of the special feature. 4.1 公称长度：机
15、器螺钉或机器螺钉和齿状垫圈装配体的公称长度为从承载面或者，若是埋头螺钉，从埋头面与顶部的理论接合处到螺纹部分最远端，包括任何倒棱或倒圆，但不包括特殊体，如止点。若有特殊体，如止点，则从埋头面与顶部接合处到特殊体的起点。4.2 TOLERANCE OF LENGTH. The length of machine screws and machine screw and tooth lock washer assemblies shall be within the tolerance on nominal length specified in the table below. 4.2. 长度公
16、差 机器螺钉和机器螺钉与齿状垫圈装配体的长度应在下表规定的公称长度相应公差范围内。Dimensions in mm Nominal length - L Tolerance Up to and including 6 +/- 0.24 Over 6 up to and including 10 +/- 0.29 Over 10 up to and including 18 +/- 0.35 Over 18 up to and including 30 +/- 0.42 Over 30 up to and including 50 +/- 0.50 Over 50 up to and including 80 +/- 0.60 Over 80 up to and including 120 +/- 0.70 FORD WORLDWIDE FASTENER STANDARD 福特全球扣件标准日期: 1996-07-01Over 120 up to and including 180 +/- 0.80 Over 180 up to and including
