1、 WORLDWIDE FASTENER STANDARD Date: 2001-01-10 WE 910 DIMENSIONAL REQUIREMENTS FOR HEXAGON AND FLANGED HEXAGON NUTS Printed copies are uncontrolled. Page 1 of 6 Copyright 2001, Ford Global Technologies, Inc. 1. SCOPE This standard gives the general and dimensional requirements for hexagon (M4 - M24),
2、 flanged hexagon (M5 - M20), and hexagon thin nuts (M4 - M24). NOTE: The dimensions specified in Table 1 are not suitable for property classes 9 and 12. The requirements for Nut and Washer Assemblies are specified in WE 901. 2. REFERENCES ISO 261 - General purpose metric screw threads - General plan
3、 ISO 965 - General purpose metric screw threads - Tolerances. ISO 1502 - General purpose metric screw threads - Gauging. ISO 1302 - Technical drawings - method of indicating surface roughness. ISO 4288 - Rules and procedures for the measurement of surface roughness parameters using stylus instrumen
4、ts. WE 901 - General requirements for nut and washer assemblies. WX 100 - Finish Specification 3. GENERAL REQUIREMENTS 3.1 DIMENSIONS AND TOLERANCES The dimensions and tolerances of hexagon, flanged hexagon, and hexagon thin nuts must be in accordance with Clauses 1 - 6, Tables 1 - 4, and Figures 1
5、 3. 3.2 GAUGING (REFEREE METHOD) For referee purposes, dimensions e, Ta, m and c are satisfied if flanged hexagon nuts meet the requirements for gauging specified in the Appendix. 4. SCREW THREADS 4.1 DIMENSIONS AND TOLERANCES Screw threads must conform to the dimensions and tolerances specified in
6、 ISO 261 and ISO 965 thread tolerance class 6H. 4.2 GAUGING Nuts shall assemble on a GO thread plug gauge. The gauge must conform to the dimensions and tolerances defined in ISO 1502 appropriate to the specified thread size and class of fit. When coated with organic type coatings tightness to inspec
7、tion gauges may be experienced, see WX 100. 5. FORM AND POSITION TOLERANCES 5.1 CONCENTRICITY OF HEXAGON TO THREAD The concentricity of the outside diameter of the flanged portion to the thread shall be within the values specified in Table 4. 5.2 CONCENTRICITY OF FLANGED PORTION TO THREAD The concen
8、tricity of the outside diameter of the flanged portion to the thread shall be within the values specified in Table 4. WORLDWIDE FASTENER STANDARD Date: 2001-01-10 WE 910 DIMENSIONAL REQUIREMENTS FOR HEXAGON AND FLANGED HEXAGON NUTS Printed copies are uncontrolled. Page 2 of 6 Copyright 2001, Ford Gl
9、obal Technologies, Inc. 5.3 SQUARENESS OF THE BEARING SURFACE TO THE THREAD 5.3.1 HEXAGON NUTS Both bearing surfaces shall be flat and perpendicular to the axis of the thread within 1o. 5.3.2 HEXAGON FLANGED NUTS The bearing surface shall be flat to concave to a maximum of 1.5ofrom the plane formed
10、by the bearing circle diameter (dw). The plane formed by the bearing circle diameter shall be perpendicular to the thread within 1o. 5.4 PARALLELISM OF HEXAGON FLATS TO THREAD The hexagon flats (measured over the minimum wrenching height m for hexagon nuts or Tafor hexagon flanged nuts) must be para
11、llel to the thread within 0.17 x m for hexagon nuts or 0.17 x Tafor hexagon flanged nuts. NOTE: All form and position tolerances may be evaluated by use of a GO screw plug gauge to ISO 1502 thread tolerance class 6g. 5.5 SURFACE ROUGHNESS The surface roughness of the bearing face should be evaluated
12、 in accordance with ISO 4288. WORLDWIDE FASTENER STANDARD Date: 2001-01-10 WE 910 DIMENSIONAL REQUIREMENTS FOR HEXAGON AND FLANGED HEXAGON NUTS Printed copies are uncontrolled. Page 3 of 6 Copyright 2001, Ford Global Technologies, Inc. Figure 1. Hexagon nuts Table 1. Dimensions of hexagon nuts Dimen
13、sions in mm Thread Size d M4 M5 M6 M8 M10 M12 M14 M16 M20 M24 Pitch 0.7 0.8 1 1.25 1.5 1.75 2 2 2.5 3 damax. 4.6 5.75 6.75 8.75 10.8 13 15.1 17.3 21.6 25.9 min. 4 5 6 8 10 12 14 16 20 24 dwmin. 5.9 6.9 8.9 11.6 13.6 16.6 19.6 22.5 27.7 33.3 e min. 7.66 8.79 11.05 14.38 16.64 20.03 23.35 26.75 32.95
14、39.55 m max. 3.2 4.7 5.2 6.8 8.4 10.8 12.8 14.8 18 21.5 min. 2.9 4.4 4.9 6.44 8.04 10.37 12.1 14.1 16.9 20.2 m 1)min. 2.32 3.52 3.92 5.15 6.43 8.3 9.68 11.28 13.52 16.16 s max. 7 8 10 13 15 18 21 24 30 36 min. 6.78 7.78 9.78 12.73 14.73 17.73 20.67 23.67 29.16 35 1) Minimum wrenching height. 2) Surf
15、ace roughness symbols in accordance with ISO 1302. WORLDWIDE FASTENER STANDARD Date: 2001-01-10 WE 910 DIMENSIONAL REQUIREMENTS FOR HEXAGON AND FLANGED HEXAGON NUTS Printed copies are uncontrolled. Page 4 of 6 Copyright 2001, Ford Global Technologies, Inc. Figure 2. Flanged hexagon nuts Table 2. Dim
16、ensions of flanged hexagon nuts Dimensions in mm Thread Size M4 M5 M6 M8 M10 M12 M14 M16 M20 Pitch 0.7 0.8 1 1.25 1.5 1.75 2 2 2.5 c min. 0.9 1 1.1 1.2 1.5 1.8 2.1 2.4 3 damax. 4.6 5.75 6.75 8.75 10.8 13 15.1 17.3 21.6 min. 4 5 6 8 10 12 14 16 20 dcmax. 10 11.8 14.2 17.9 21.8 26 29.9 34.5 42.8 dwmin
17、 5.9 9.8 12.2 15.8 19.6 23.8 27.6 31.9 39.9 e min. 7.66 8.79 11.05 14.38 16.64 20.03 23.36 26.75 32.95 m max. 4 5 6 8 10 12 14 16 20 min. 3.7 4.7 5.7 7.6 9.6 11.6 13.3 15.3 18.9 s max. 7 8 10 13 15 18 21 24 30 min. 6.78 7.78 9.78 12.73 14.73 17.73 20.67 23.67 29.16 m 1)min 2 2.2 3.1 4.5 5.5 6.7 7.8
18、 9 11.1 r2)max. 0.24 0.3 0.36 0.48 0.6 0.72 0.88 0.96 1.2 1) Minimum wrenching height. 2) Radius r applies both at the corners and at the flats of the hexagon. 3) Surface roughness symbols in accordance with ISO 1302. WORLDWIDE FASTENER STANDARD Date: 2001-01-10 WE 910 DIMENSIONAL REQUIREMENTS FOR H
19、EXAGON AND FLANGED HEXAGON NUTS Printed copies are uncontrolled. Page 5 of 6 Copyright 2001, Ford Global Technologies, Inc. Figure 3. Hexagon thin nuts Table 3. Dimensions of hexagon thin nuts Dimensions in mm Thread Size M4 M5 M6 M8 M10 M12 M14 M16 M20 M24 Pitch 0.7 0.8 1 1.25 1.5 1.75 2 2 2.5 3 da
20、max. 4.6 5.75 6.75 8.75 10.8 13 15.1 17.3 21.6 25.9 min. 4 5 6 8 10 12 14 16 20 24 dwmin. 5.9 6.9 8.9 11.6 13.6 16.6 19.6 22.5 27.7 33.2 e min. 7.66 8.79 11.05 14.38 16.64 20.03 23.35 26.75 32.95 39.55 m max. 2.2 2.7 3.2 4 5 6 7 8 10 12 min. 1.95 2.45 2.9 3.7 4.7 5.7 6.42 7.42 9.1 10.9 m 1)min. 1.56
21、 1.96 2.32 2.96 3.78 4.56 5.14 5.94 7.38 8.72 s max. 7 8 10 13 15 18 21 24 30 36 min. 6.78 7.78 9.78 12.73 14.73 17.73 20.67 23.67 29.16 35 1) Minimum wrenching height. 2) Surface roughness symbols in accordance with ISO 1302. WORLDWIDE FASTENER STANDARD Date: 2001-01-10 WE 910 DIMENSIONAL REQUIREME
22、NTS FOR HEXAGON AND FLANGED HEXAGON NUTS Printed copies are uncontrolled. Page 6 of 6 Copyright 2001, Ford Global Technologies, Inc. Table 4. Form and position tolerances Dimensions in mm Nominal Thread Diameter d M4 M5 M6 M8 M10 M12 M14 M16 M20 M24 Concentricity - Hexagon Flats to Thread 0.44 0.54 0.66 0.78 Concentricity - Flanged Portion to Thread - 0.86 1.04 1.24 - NOTE: The above dimensions represent Total Indicator Movement.
