1、 Printed copies are uncontrolled Copyright 2016, Ford Global Technologies, LLC. Page 1 of 7 WORLDWIDE FASTENER STANDARD WB 910 2016-09-09 General and Dimensional Requirements of Pan Head Bolts and Screws, Pan Head Bolt & Washer and Screw & Washer Assemblies 1. SCOPE This standard specifies the mecha
2、nical properties and dimensional requirements of pan head bolts and screws, pan head bolt & washer and pan head screw & washer assemblies with recess drive systems and ISO metric thread diameters M5 to M16 inclusively. 2. REFERENCES ISO 898/1 - Mechanical properties of fasteners - Part 1: Bolts, scr
3、ews and studs. ISO 3269 - Fasteners - Acceptance inspection. ISO 4759/1 - Tolerances for fasteners. ISO 6157/3 - Fasteners Surface discontinuities. ISO 8992 - Fasteners - General requirements for bolts, screws, studs and nuts. WA 900 - Dimensional requirements for hexagon and flanged hexagon bolts a
4、nd screws, and hexagon screw and washer assemblies. WA 950 - Material Requirements & Mechanical Properties of Bolts, Studs, and Bolt & Washer Assemblies. WA 990 - Surface discontinuities of bolts and screws. WF 900 - Dimensional, Material, Heat Treatment, Hardness and Performance Requirements for Fl
5、at, Toothed, Conical, Bowed and Wavy Washers for general use and for use in Screw or Nut and Washer Assemblies. WX 100 - Finish Specification 3. MECHANICAL PROPERTIES Bolts, screws, bolts and screw & washer assemblies shall have the mechanical properties as specified in WA 950 and shall meet the req
6、uirements of ISO 898/1 for tensile strength under wedge loading of full-size bolts and screws and head soundness. 4. GENERAL REQUIREMENTS 4.1 DIMENSIONS AND TOLERANCES The basic dimensions are shown in the individual product standards or Utility Parts drawings. Unspecified general requirements, dime
7、nsions and tolerances not stated here within shall be in accordance with: ISO 8992. ISO 4759-1 Product grade A for the fully threaded shank portion of pan headed bolts. 4.2 ACCEPTANCE INSPECTION The acceptance inspection procedure to determine lot acceptability shall be according to ISO 3269 for req
8、uirements not included in a specific product standard. 4.3 SCREW THREAD CONFORMANCE Screw threads must conform to the dimensions, tolerance, gauging acceptability and protective finish allowance as specified in WA 900. 4.4 WASHERS. The dimensions, tolerances and materials requirements of the washer
9、component of machine screw and washer assemblies shall be in accordance with WF 900. Printed copies are uncontrolled Copyright 2016, Ford Global Technologies, LLC. Page 2 of 7 WORLDWIDE FASTENER STANDARD WB 910 2016-09-09 General and Dimensional Requirements of Pan Head Bolts and Screws, Pan Head Bo
10、lt & Washer and Screw & Washer Assemblies 4.5 SHORT NP PILOT POINT. The length, diameter and end of pilot points shall be as specified here within unless otherwise specified on the Utility Parts drawings. 4.5.1 LENGTH AND DIAMETER The length and diameter of pilot points shall be as specified in Tabl
11、e 1. 4.5.2 ENDS OF BOLTS Unless otherwise specified on the Utility Parts drawings, the ends of bolts shall be as specified in Figure 1. Ends of pilot point shall be flat or slightly indented to permit normal material flow as illustrated in Figure 1. Figure 1 - Pilot Details of Pan Head Bolts. Table
12、1 - Pilot Details of Pan Head Bolts. Size M5 M6 M8 M10 M12 M14 M16 Lp1 max 4.3 5.15 6.7 8.05 9.65 10.93 11.60 Lp2 max 2.7 3.15 4.2 5.15 6.15 6.93 7.70 min 2.2 2.65 3.7 4.65 5.65 6.43 7.20 dp1) max 4.12 4.9 6.62 8.36 10.09 11.82 13.82 min 3.97 4.77 6.49 8.21 9.91 11.67 13.67 dp2 max 3.0 4.0 5.5 7.0 8
13、.5 10.0 11.5 r min 0.3 0.5 1.0 1.5 2.0 2.5 3.0 Before Thread Rolling dp max 4.030 4.800 6.540 8.230 9.950 11.700 13.700 min 3.954 4.724 6.447 8.143 9.880 11.604 13.609 Notes: 1) After Thread Rolling 4.6 GAUGING REQUIREMENTS RECESSES The gauging requirements shall be in accordance with WB 900 Appendi
14、x F, which specifies the shape and basic dimensions of enhanced hexalobular internal driving feature for bolts and screws including the gauging method. Printed copies are uncontrolled Copyright 2016, Ford Global Technologies, LLC. Page 3 of 7 WORLDWIDE FASTENER STANDARD WB 910 2016-09-09 General and
15、 Dimensional Requirements of Pan Head Bolts and Screws, Pan Head Bolt & Washer and Screw & Washer Assemblies 4.7 PROTECTIVE FINISH. 4.7.1 DIMENSIONS AND TOLERANCES. All dimensions and tolerances defined in this specification apply prior to the application of the protective finish except where otherw
16、ise specified. 4.7.2 FINISH SPECIFICATION. Finish used on Worldwide Standard and Utility Parts shall be as specified per WX 100. Utility Fastener based on a Standard fastener with a special, or S900 series surface finish, shall have the finish requirements specified on the drawing. 4.8 MARKING Pan h
17、ead bolts and screws shall be marked with the manufacturers identification mark and with the marking symbol of the property class per WA 950, unless otherwise specified on a Utility drawing. The marking is obligatory for all property classes and shall be on the top of the head by indenting or emboss
18、ing. Marking is required for pan head bolts and screws with nominal diameters d 5 mm. Note: Embossed head markings (See WA 950) are excluded from head height measurements but must not protrude more than 0.4 Figure 2 - Example of marking on Pan Head Bolts and Screws. 5. DIAMETER OF SHANK (UNTHREADED
19、PORTION) 5.1 BOLTS AND SCREWS. Reduced shank is the only shank design permitted unless otherwise specified on a Utility drawing. 5.2 BOLTS, SCREWS, BOLT & WASHER AND SCREW & WASHER ASSEMBLIES. The diameter of the unthreaded portion of bolt & washer assemblies must be less than the major diameter of
20、the bolt thread by an amount sufficient to permit free rotation of the washer, while disassembly from the bolt is prevented. The fillet type use for bolt and washer assemblies shall be at the discretion of the manufacturer provided all other requirements of the standard are met. The washers thicknes
21、s shall be greater than the bolts pitch to prevent washer binding. 6. FILLET AND THREAD RUNOUT ISO Type F (Permissible Shape) fillet per WA 900 shall be supplied for all parts unless the Type U fillet per WA 900 is stated otherwise per the Utility drawing. Printed copies are uncontrolled Copyright 2
22、016, Ford Global Technologies, LLC. Page 4 of 7 WORLDWIDE FASTENER STANDARD WB 910 2016-09-09 General and Dimensional Requirements of Pan Head Bolts and Screws, Pan Head Bolt & Washer and Screw & Washer Assemblies 7. LENGTH 7.1 NORMAL LENGTH. The normal length of a machine screw or a machine screw a
23、nd washer assembly is the distance from the bearing face to the furthest end of the threaded portion including any chamfer or radius but excluding a special feature such as a dog point. 7.2 TOLERANCE OF LENGTH. The length of machine screws and machine screw and washer assemblies shall be within the
24、tolerance on nominal length specified in the table below. Table 2 - Tolerance of Length Dimensions in mm Nominal length - L Tolerance 5 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
25、 0.50 Over 50 up to and including 80 0.60 Over 80 up to and including 120 0.70 Over 120 up to and including 180 0.80 Over 180 up to and including 250 0.93 8. BOLT AND SCREW & WASHER ASSEMBLY 8.1 WASHER 8.1.1 FORM AND POSITION TOLERANCES. The form and position tolerances for the washer component shal
26、l be in accordance with WF 900. 8.1.2 TEST REQUIREMENTS. The washer component of assemblies shall meet the test requirements specified in WF 900, except Section 4.1 Recovery from Compression, prior to assembly except for hardness which must be as specified in WF 900 after assembly. 8.1.3 MATERIAL, H
27、EAT TREATMENT AND HARDNESS. The washer component of bolt and screw & washer assemblies shall be Material, Heat Treat & Hardness Class B per WF900. 8.1.4 TYPE. The washer component of assemblies shall be conical unless otherwise specified on the Utility Parts drawings. 9. FORM AND POSITION TOLERANCES
28、 The tolerances of form and position are in accordance with ISO 4759/1 for Product Grades A, except as stated here within. 10. SURFACE DISCONTINUITIES Shall be evaluated in accordance with ISO 6157/3. Printed copies are uncontrolled Copyright 2016, Ford Global Technologies, LLC. Page 5 of 7 WORLDWID
29、E FASTENER STANDARD WB 910 2016-09-09 General and Dimensional Requirements of Pan Head Bolts and Screws, Pan Head Bolt & Washer and Screw & Washer Assemblies 11. DIMENSIONAL REQUIREMENTS Figure 3 - Head Details of Pan Head Bolts. Table 3 - Head Dimensions of Pan Head Bolts. Size M5 M6 M8 M10 M12 M14
30、 M16 Pitch 0.8 1 1.25 1.5 1.75 2.0 2.0 Drive Size 25IP 30IP 40IP 50IP 55IP 60IP 70IP I max 2.08 2.58 3.11 4.11 5.21 6.18 7.23 min 1.76 2.19 2.64 3.49 4.58 5.55 6.60 k max 4.3 5.1 6.25 8.1 9.9 11.7 14.0 min 4 4.8 5.85 7.7 9.5 11.2 13.5 f min 1.4 1.4 2.4 3.2 3.8 4.1 4.5 rf min 7.0 7.5 9.5 11.5 13.5 16
31、.5 19.5 r1 min 0.20 0.25 0.40 0.40 0.60 0.60 0.60 dk max 11.1 13.1 17.0 21.2 25.0 29.0 33.3 dw min 9.3 11.1 15.0 18.7 22.5 26.1 30.1 df max 5.5 7.3 8.7 11.4 14.5 17.2 20.1 HSR 1.20 1.20 1.20 1.20 1.20 1.20 1.20 Printed copies are uncontrolled Copyright 2016, Ford Global Technologies, LLC. Page 6 of
32、7 WORLDWIDE FASTENER STANDARD WB 910 2016-09-09 General and Dimensional Requirements of Pan Head Bolts and Screws, Pan Head Bolt & Washer and Screw & Washer Assemblies Figure 4 - Length Details of Pan Head Bolts. Table 4 - Length Dimensions of Pan Head Bolts. Size M5 M6 M8 M10 M12 M14 M16 Pitch 0.8
33、1 1.25 1.5 1.75 2.0 2.0 Drive Size 25IP 30IP 40IP 50IP 55IP 60IP 70IP a max L2.5d 2.0 2.5 3.15 3.8 4.45 5.0 5.0 L2.5d 2.4 3.0 3.8 4.5 5.3 6.0 6.0 Head Strength Ratio (HSR) 1.20 1.20 1.20 1.20 1.20 1.20 1.20 Notes: a max is the distance from the underhead bearing surface to the leading face of a thre
34、ad ring gauge which has been screwed as far as possible onto the bolt by hand. a min = 1 Pitch. For bolt & washer assemblies, “a” shall be measured from the washer, instead of the underhead bearing surface. Lft is the minimum distance to the first fully formed thread, which is equal to LMIN-(Lp1MAX-
35、Lp2MIN) Printed copies are uncontrolled Copyright 2016, Ford Global Technologies, LLC. Page 7 of 7 WORLDWIDE FASTENER STANDARD WB 910 2016-09-09 General and Dimensional Requirements of Pan Head Bolts and Screws, Pan Head Bolt & Washer and Screw & Washer Assemblies 12. DIAGRAMS AND TABLES TO ASSIST D
36、ESIGN ENGINEERING Pan Head Shoulder Bolts The following diagrams and tables have been included to assist Design Engineers in the development of Utility Part drawings for Pan Head Shoulder Bolts. THREAD LENGTH DIMENSION OF BOLTS Lg MAX, b REF and L Nom are defined per the Utility Parts drawing. b REF
37、 = L Nominal - Lg Ls MIN =Lg-5P. Its value must be Lsi+P. Figure 5 - Shoulder and Length Details of Pan Head Shoulder Bolts. Table 5 - Shoulder Dimensions of Pan Head Bolts. Size M5 M6 M8 M10 M12 M14 M16 Pitch (P) 0.8 1 1.25 1.5 1.75 2.0 2.0 Drive Size 25IP 30IP 40IP 50IP 55IP 60IP 70IP ds max 5.0 6.0 8.0 10.0 12.0 14.0 16.0 min 4.82 5.82 7.78 9.78 11.73 13.73 15.73 Lsi max 3.5 4.0 5.0 6.0 7.0 8.0 9.0 min 2.5 3.0 4.0 5.0 6.0 7.0 8.0 Head Strength Ratio (HSR) 1.44 1.45 1.44 1.43 1.42 1.42 1.47
