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1、 FORD WORLDWIDE FASTENER STANDARD 福特全球扣件标准 日期 : 1996-07-01 WB 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 t

2、he general 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.

3、范围：本标准规范规定了大柱头、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 476

4、2 -Hexagon 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.

5、引用 ISO 261 通用公制螺钉螺纹 -总纲 ISO 965 通用公制螺钉螺纹 -公差 ISO 1502 通用公制螺钉螺纹 -测量 ISO 4762 A 极六角座头螺钉 ISO 7721 埋头螺钉 -头部结构及测量 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 : 1996-07-01 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 an

6、d tolerances of 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.

7、 The dimensions, tolerances 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

8、上自由旋转但不能脱落。 3.3 RECESSES. 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

9、和公差应符合附录 A 的要求。 3.4 PILOT 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 d are satisfied if k the heads of

10、 countersunk screws meet the 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合格。 kk 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

11、 the specified thread and class of 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 : 1996-07-01 3.5.2 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

12、the gauge point are defined in Appendix 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

13、. 4.长度 4.1 NORMAL LENGTH. The normal length 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

14、portion including any chamfer or radius but 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 com

15、mencement of the special feature. 4.1 公称长度：机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

16、length specified in the table below. 4.2. 长度公差 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

17、 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 : 1996-07-01 Over 120 up to and including 180 +/- 0.80 Over 180 up to and including 250 +/- 0.93 尺寸（ mm） 公称长度 - L 公差 L6 +/- 0.24 +/- 0.29 之上 6 L10 +/-

18、0.35 之上 10 L18 +/- 0.42 之上 18 L30 +/- 0.50 之上 30 30L50 +/- 0.60 之上 50L80 +/- 0.70 之上 80 L120 +/- 0.80 之上 120 L180 +/- 0.93 之上 180 L250 5. LENGTH OF THREAD AND THREAD RUN-OUT (REFEREE METHOD). 5. 螺纹和螺纹末端长度（判断方法） 5.1 THREAD. In cases of dispute the thread length b shall be measured as the distance fro

19、m the end of the screw to the leading face of a screw ring gauge (See Clause 3.5.2) which has been screwed as far as possible onto the screw by hand. 5.1. 螺纹 如有分歧，用手尽量把环规旋到螺钉上，螺纹长度 b 为从螺纹末端到螺纹环规导向面的距离（见第 3.5.2 条）。 5.2 RUN-OUT. In cases of dispute dimensions a and x shall be measured using the ring g

20、auge specified in Clause 3.5.2 screwed as far as possible onto the screw by hand. 5.2 末端 如有分歧， 用手尽量把第 3.5.2 条规定环规旋到螺钉上测量尺寸a 和 x. 6. DIAMETER OF SHANK (UNTHREADED PORTION). 6. 螺杆直径（无螺纹部分） 6.1 SCREWS. The diameter of the unthreaded portion may be approximately equal to the pitch diameter (i.e., the no

21、rmal thread rolling diameter) appropriate to the size of the thread or, alternatively, equal to the major diameter as specified in ISO 965. 6.1. 螺钉 无螺纹处直径近似等于螺纹中径（即 螺纹滚动公称直径）或等于 ISO 965 规定的大径 6.2 SCREW AND TOOTH LOCK WASHER ASSEMBLIES. The diameter of the unthreaded portion of screw and tooth lock w

22、asher assemblies shall be less than the major FORD WORLDWIDE FASTENER STANDARD 福特全球扣件标准 日期 : 1996-07-01 diameter of the screw thread by an amount sufficient to allow free rotation of the washer. 6.2. 螺钉和齿状垫圈装配体 螺钉和齿状垫圈装配体无螺纹部分直径应比螺纹大径小足够余量以便垫圈自由旋转。 7. SCREW THREADS. 7. 螺钉螺纹 7.1 Prior to any surface

23、treatment screw threads must conform to the dimensions and tolerances specified in ISO 261 and ISO 965 tolerance class 6g. 7.1 任何表面处理之前，螺纹必须符合 ISO 261 和 ISO 965 6g 公差等级规定的尺寸和公差。 7.2 After electro or mechanical plating (when specified) screw threads may exceed the maximum dimensions for 6g, unless ot

24、herwise specified on the part drawing, but must not exceed the maximum dimensions for tolerance class 4h. 7.2 经过电镀或机械处理后（当规定时），螺纹可能超过 6g 公差最大尺寸，除非另有规定，不应超过4h 公差等级的最大尺寸。 8. FORM AND POSITION TOLERANCES. 8.公差种类和等级 8.1 CONCENTRICITY OF SHANK TO THREAD. The concentricity of the shank (measured over dime

25、nsion A - See Figure 4 and Clause 8.7) shall be within the values specified in Table 4. 8.1 螺杆与螺纹的同轴度 螺杆与螺纹的同轴度应符合表 4规 定的范围内（测量 A 尺寸，见图 4 和第 8.7 条）。 8.2 CONCENTRICITY OF PAN HEAD TO SHANK OR THREAD. The concentricity of the recess to the shank or thread (measured over dimension A - See Figure 4 and

26、Clause 8.7) shall be within the values specified in Table 4. 8.2. 大柱头与螺杆或螺纹的 同轴度 凹槽与螺杆或螺纹的同轴度应在表 4 规定的范围内（测量 A尺寸，见图 4 和第 8.7 条）。 8.3 CONCENTRICITY OF RECESS TO SHANK OR THREAD. The concentricity of the recess to the shank or thread (measured over dimension A - See Figure 4 and Clause 8.7) shall be w

27、ithin the values specified in Table 4. 8.3 凹槽与螺杆或螺纹的同轴度 凹槽与螺杆或螺纹的同轴度应在表 4规定的范围内（测量 A 尺寸，见图 4 和第 8.7 条）。 FORD WORLDWIDE FASTENER STANDARD 福特全球扣件标准 日期 : 1996-07-01 8.4 RUN-OUT OF COUNTERSUNK FACE TO SHANK OR THREAD. The run-out of the countersunk face of flat countersunk and raised countersunk heads t

28、o the shank or thread (measured over dimension A - See Figure 4 and Clause 8.7) shall be within the values specified in Table 4. 8.4 埋头面到螺 杆或螺纹的末端 埋头面到螺杆或螺纹的末端应符合表 4 规定（测量 A 尺寸，见图 4和第 8.7 条）。 8.5 STRAIGHTNESS. The straightness (measured over dimension L - See Figure 4.) shall be within the values sp

29、ecified in Table 4. 8.5 直线度 直线度应符合表 4 规定（测量 L 尺寸，见图 4）。 8.6 SQUARENESS OF THE BEARING SURFACE OF PAN HEADS TO THE SHANK OR THREAD. The bearing surface (measured over a diameter of 0.8dk) shall be square to the shank oor thread (measured over dimension A - See Figure 4 and Clause 8.7) within 1. o 8.6

30、 大柱头承载面与螺杆或螺纹的垂直度 承载面与螺杆或螺纹的垂直度应在 1 之内（测量A 尺寸，见图 4 和第 8.7 条）。 8.7 FORM AND POSITION TOLERANCES - METHOD OF MEASUREMENT. When the datum feature is the threaded portion, the datum diameter shall be the Pitch Diameter. Alternatively a GO Screw Ring Gauge to ISO 1502, tolerance class 6h with a 05d minim

31、um thickness may be used. 8.7 公差种类和等级 当数据特征为螺纹部分，基准直径应为螺距。或用最小厚度 05d, 公差等级为 6g ISO2 GO 型螺纹环规。 8.8 POSITION TOLERANCES FOR PILOT POINTS SHALL BE AS SPECIFIED IN WA 900 TABLE 10 AND FIGURE 10. 8.8. 导向尖公差位置见 WA 900 表 10 和图 10 规定。 9. SURFACE ROUGHNESS. The surface roughness of the bearing face shall be

32、evaluated in line with WA 990 Clause 2.5. 表面粗糙度 按照 WA 990 第 2.5 条估算承载面表面粗糙度。 FORD WORLDWIDE FASTENER STANDARD 福特全球扣件标准 日 期 : 1996-07-01 Figure 1. 图 1 Table 1. Dimensions in mm FORD WORLDWIDE FASTENER STANDARD 福特全球扣件日期 : 1996-07-01 表 1 尺寸（ mm） 规格 M2.5 M3 M3.5 M4 M5 M6 M8 M10 0.45 0.5 0.6 0.7 0.8 1 1.

33、25 1.5 螺距 1 2 3 4 驱动等级 b 25 25 38 38 38 38 38 38 最小 d 3.1 3.6 4.1 4.7 5.7 6.8 9.2 11.2 最大 ad 5 5.6 7 8 9.5 12 16 20 最大 k 4.7 5.3 6.64 7.64 9.14 11.57 15.57 19.48 最小 k 2.1 2.4 2.6 3.1 3.7 4.6 6 7.5 最大 1.96 2.26 2.46 2.92 3.52 4.3 5.7 7.14 最小 r 0.1 0.1 0.1 0.2 0.2 0.25 0.4 0.4 最小 r 4 5 6 6.5 8 10 13 1

34、6 标准 f x 1.1 1.25 1.5 1.75 2 2.5 3.2 3.8 最大 d - - - 8 9 11 14 - 标准 2 1)最大 a 0.9 1 1.2 1.4 1.6 2 2.5 3 1) a max for screw and washer assemblies shall be the free height (h1) of the washer plus 2 pitches. 1）螺钉和垫圈装配体的最大值应为垫圈自由高度（ h）加 2 个螺距。 1 Figure 2. 凸面埋头螺 钉 FORD WORLDWIDE FASTENER STANDARD 福 特 全 球 扣

35、 件 标 准 日期 : 1996-07-01 Table 2. T = Theoretical. A = Actual Dimensions in mm Size M2.5 M3 M3.5 M4 M5 M6 M8 M10 Pitch 0.45 0.5 0.6 0.7 0.8 1 1.25 1.5 T max. 5.5 6.3 8.2 9.4 10.4 12.6 17.3 20 dk A max. 4.7 5.5 7.3 8.4 9.3 11.3 15.8 18.3 min. 4.4 5.2 6.9 8 8.9 10.9 15.4 17.8 f ref. 0.6 0.7 0.8 1 1.3 1.

36、5 2 2.5 k max. 1.5 1.65 2.35 2.7 2.7 3.3 4.65 5 r min. 0.6 0.8 0.9 1 1.3 1.5 2 2.5 rt ref. 5 6 8.5 9.5 9.5 12 16.5 19.5 x max. 1.1 1.25 1.5 1.75 2 2.5 3.2 3.8 d3 ref. - - - 9 10 12 - - a max. 0.9 1 1.2 1.4 1.6 2 2.5 3 b min. 25 25 38 38 38 38 38 38 Driver Size 1 2 3 4 表 2. T = 理论值 . A =实际值 尺寸（ mm） 规

37、格 M2.5 M3 M3.5 M4 M5 M6 M8 M10 0.45 0.5 0.6 0.7 0.8 1 1.25 1.5 螺距 5.5 6.3 8.2 9.4 10.4 12.6 17.3 20 T 最大 d 4.7 5.5 7.3 8.4 9.3 11.3 15.8 18.3 A 最大 k 4.4 5.2 6.9 8 8.9 10.9 15.4 17.8 最小 f 0.6 0.7 0.8 1 1.3 1.5 2 2.5 标准 k 1.5 1.65 2.35 2.7 2.7 3.3 4.65 5 最大 r 0.6 0.8 0.9 1 1.3 1.5 2 2.5 最小 r 5 6 8.5 9

38、.5 9.5 12 16.5 19.5 标准 t x 1.1 1.25 1.5 1.75 2 2.5 3.2 3.8 最大 d - - - 9 10 12 - - 标准 3 a 0.9 1 1.2 1.4 1.6 2 2.5 3 最大 b 25 25 38 38 38 38 38 38 最小 驱动等级 1 2 3 4 FORD WORLDWIDE FASTENER STANDARD 福特全球扣件标准 日期 : 1996-07-01 Figure 3. 平面埋头螺钉 Table 3. T = Theoretical. A = Actual Dimensions in mm FORD WORLDW

39、IDE FASTENER STANDARD 福特全球扣件标准 日期 : 1996-07-01 表 3 T=理论值 A=实际值 尺寸（ mm） 规格 M2.5 M3 M3.5 M4 M5 M6 M8 M10 0.45 0.5 0.6 0.7 0.8 1 1.25 1.5 螺距 1 2 3 4 驱动等级 25 25 38 38 38 38 38 38 b 最小 d 5.5 6.3 8.2 9.4 10.4 12.6 17.3 20 T 最大 k 4.7 5.5 7.3 8.4 9.3 11.3 15.8 18.3 A 最大 . 4.4 5.2 6.9 8 8.9 10.9 15.4 17.8 最小 1.5 1.65 2.35 2.7 2.7 3.3 4.65 5 k 最大 0.6 0.8 0.9 1 1.3 1.5 2 2.5 r 标准 1.1 1.25 1.5 1.75 2 2.5 3.2 3.8 x 最大 - - - 8 10 12 - - d 标准 3 最大平螺纹 0.9 1 1.2 1.4 1.6 2 2.5 3 a Figure 4. 公差种类和位置 Table 4. Tolerance for concentricity and straightness Dimensions in mm Nominal Thread Diameter d M2.5 M3