1、FORD WORLDWIDE FASTENER STANDARDDate: 1993-01-01Engineering Standards & 1 of 4 Printed copies are uncontrolled .Systems Engineering (ESSE)WZ 100Steel Metric Threaded Fasteners Torque/Clamping Force Performance1. SCOPE.1.1 This Worldwide Standard specifies the torque/clamping force performance requir
2、ement for ISOMetric coarse threaded steel fasteners tested at room temperature as specified in ISO 1.(a) With thread sizes M3 to M39 inclusive.(b) With strength requirements in accordance with WA 950, WE 950 or WE 952 asappropriate.(c) With dimensions as specified in the Worldwide Product Standards.
3、Unless stated otherwise, all references to nuts and bolts in this Worldwide Standard are to bothflanged and non-flanged products.1.2 EXCEPTIONS. Bolts, screws and nuts with performance specifications containingtorque/clamping force requirements are excluded from the provisions of this specifications
4、.2. REFERENCES.ISO 1 - Standard Reference Temperature for Industrial Length Measurement.ISO 1302 - Technical Drawing - Method of Indicating Surface Texture onDrawings.ISO 965/1 - General Purpose Metric Screw Threads - Tolerances - Part 1:Principles and Basic Data.WA 950 - Material Requirements and M
5、echanical Properties of Bolts, Screws,Studs and Screw and Washer Assemblies.WE 950 - Prevailing Torque-Type Steel Hexagon Nuts and Hexagon FlangeNuts - Mechanical a nd Performance Properties.WE 952 - Mechanical Properties of Nuts with Specified Proof Load Values.WX 100 - Finish Specifications.WSD-M1
6、3P7-A - Torque/Clamping Force Control.WSS-M99P9999-A - Substance Use Restrictions.3. DEFINITIONS.3.1 CLAMPING FORCE. The clamping force is that force which applied by the bearing face of thefastener against a mating component after application of a specified tightening torque.4. FINISH. The performa
7、nce of fasteners which are supplied with a protective coating and/or lubricant shallnot deteriorate when the fasteners are stored indoors for a period of six months. The storage temperatureshall be within the range -5 o C to +40 o C. Packaging shall be in accordance with Q101.Lubricant when used sha
8、ll be in accordance with the requirements of WSD-M13P7-A.NOTE: Fasteners which are specified unlubricated by the user may not satisfy the requirements of thisspecification unless lubrication is an integral property of a specified coating.Substance restrictions imposed by law, regulations or Ford, ap
9、ply to the materials addressed by thisdocument. The restrictions are defined in Engineering Material Specification WSS-M99P9999-A1.,5. PERFORMANCE REQUIREMENTS.5.1 TORQUE/CLAMPING FORCE. The torque necessary to develop the clamping force specified inTable 1 shall be measured as specified in Clause 6
10、 and must meet the applied torque specified inTable 1.FORD WORLDWIDE FASTENER STANDARDDate: 1993-01-01Engineering Standards & 2 of 4 Printed copies are uncontrolled .Systems Engineering (ESSE)WZ 100Steel ISO Metric Threaded Fasteners Torque/Clamping Force Performance5.2 PARTS UNSUITABLE FOR TESTING.
11、 Parts with configurations or dimensions which areinfeasible to test to the requirements of Clause 6 shall be assessed by testing suitable fastenerscoated by the same process in the same production run.For initial sample and referee purposes screw or nut and washer assemblies shall be tested forcomp
12、liance with Clause 6 with the washer removed. For general control purposes the performancemay be assessed using suitable fasteners coated by the same process in the same production run.NOTE: While not mandatory, M10 coarse thread hexagon head bolts 50 to 60mm in length haveproved to be suitable surr
13、ogate parts to process in the production run.6. TORQUE/CLAMPING FORCE TEST. The torque/clamping force test shall be conducted at roomtemperature (See ISO 1) using a clamping force measuring device (Clause 6.2). For referee purposes thetorque measuring device (Clause 6.1) must not exceed 30 r.p.m.A t
14、est bolt or nut (Clauses 6.3 and 6.4) shall be inserted in the clamping force measuring device and a testwasher (Clause 6.5) placed under the clamping face of the fastener to be tested. Tightening may be eithermanually with a torque wrench (a recommended technique is described in Appendix A), or wit
15、h anequivalent torque sensing power device (Clause 6.1).The fastener to be tested shall be tightened until the clamping force specified in Table 1 appropriate to theproperty class of the fastener is achieved. The applied torque must be within the values specified in Table1.For referee purposes, an a
16、utomatic torque sensing device shall be used and rotation shall continue untilthe specified clamping force is exceeded. A continuous record of torque and clamping force shall beevaluated to determine the torque for the clamping force specified in Table 1. The applied torque must bewithin the values
17、specified in Table 1.6.1 TORQUE MEASURING DEVICE. The torque measuring device (torque wrench or power device)shall be accurate to +/- 2% of the torque specified for the fastener to be tested. For refereepurposes, the measuring device shall be chosen so that all readings fall within the upper half of
18、 itstorque range.6.2 CLAMPING FORCE MEASURING DEVICE. The force measuring device shall be an instrumentcapable of measuring the actual clamping force generated as the fastener is tightened. The deviceshall be accurate to within 3% of the test clamping force requirement. The bolt clearance hole inthe
19、 backing plate shall be the same diameter and tolerance as the test washer. The face againstwhich the test washer bears shall be smooth, flat within 0.1/100 and square with the axis of the testbolt within a tolerance of 0.1/100. The axis of the test bolt and test washer must be aligned so as toavoid
20、 contact between the fillet radius of the bolt and the inside diameter of the washer.6.3 TEST BOLT FOR NUT TESTING. Threads shall be in accordance with ISO 965/1 within atolerance of class 6g min. to 4h max. Threads on all test bolts shall be produced by rolling. Testbolt length shall be such that a
21、 minimum of two thread pitches as measured from the end of the testbolt will protrude through the nut when the nut is seated against the test washer. Thread lengthshall be such that a minimum of two full threads are within the grip after the nut is seated.The test bolt shall have a point which is fl
22、at and chamfered. The thread surface shall be free ofburrs or other contamination that might affect an accurate determination of the performance of thenut.The test bolt shall have an ultimate strength related to the specified property class of the nut to betested and the properties shall be in accor
23、dance with WA 950.A new test bolt shall be used for testing each nut.FORD WORLDWIDE FASTENER STANDARDDate: 1993-01-01Engineering Standards & 3 of 4 Printed copies are uncontrolled .Systems Engineering (ESSE)WZ 100Steel Hexagon ISO Metric Threaded Fasteners Torque/Clamping Force Performance6.3.1 The
24、test bolt shall be finished to the requirements of S309.Test bolts are normally purchased in large quantities. Prior to use for testing, the testbolts are washed, gauged and lubricated with a lubricant approved to WSD-M13P7-A. Atorque clamp force test to certify the finish of the test bolt is not no
25、rmally performed.6.4. TEST NUT FOR BOLT TESTING. Threads shall be in accordance with ISO 965/1 with atolerance of 6H. The test nut shall have a proof load related to the specified property class of thebolt to be tested and the properties shall be in accordance with WE 952.6.4.1 The test nut shall be
26、 finished to the requirements of S309.Test nut are normally purchased in large quantities. Prior to use for testing, the test nutare washed, gauged and lubricated with a lubricant approved to WSD-M13P7-A. Atorque clamp force test to certify the finish of the test nut is not normally performed.6.5 TE
27、ST WASHER. Test washers shall be made from carbon steel quenched and tempered to asurface hardness of 500 - 600HV and a core hardness of 450 - 490HV and must be unplated. Bothfaces shall be clean and lubricant free.The dimensions shall be as specified in Table 2.The faces shall be flat and parallel
28、within a tolerance zone of 4% of the specified minimumthickness. The surface roughness of the abutment face shall fall within the range N4 - N5 (SeeISO 1302). Test washers must be designed such that when assembled into the test equipment,rotation of the washer is prevented during tightening of the n
29、ut or bolt. Any device used to preventrotation shall not intrude into a diameter equal to the maximum bearing face diameter of the nutsor bolts to be tested. Alternatively, multi-hold plates may be used provided that they conform tothe requirements for hardness, hole dimensions and surface condition
30、, thickness, flatness andparallelism.The abutment face shall be re-prepared in accordance with the above between each test or a newwasher used, a recommended re-preparation method is shown below.6.5.1 RE-PREPARATION OF THE TEST WASHER. After performing a torque clamp forcetest the washer is removed
31、from the machine. Using 600 “wet or dry“ paper remove anyscratching and/or surface finish pick up. The required surface roughness is achieved byrubbing the washer face across an unused piece of 600 “wet or dry“ paper. A single passof about 150 to 200mm using firm but not excessive pressure has prove
32、d to achieve therequired N4 - N5 roughness. Surface grinding will be needed occasionally to preventrounding of the washer face.After re-preparation the surface roughness should be checked prior to testing. Acomparison test using surface grinding gauges has proved to be satisfactory when usingthis re
33、-preparation technique.FORD WORLDWIDE FASTENER STANDARDDate: 1993-01-01Engineering Standards & 4 of 4 Printed copies are uncontrolled .Systems Engineering (ESSE)WZ 100Steel ISO Metric Threaded Fasteners Torque/Clamping Force PerformanceTable 1. Clamping force and applied torque - Bolts, screws and n
34、utsClamping Force kN 1) Applied Torque Nm 3)Nom.Dia. Property Class 4.6 & 4.8 2) 8.8/8 9.8/910.9 & 10.9 /10 12.9/124.6 &4.8 2)8.8/8 9.8/9 10.9 &10.9 /1012.9/12 Mean +/- Mean +/- Mean +/- Mean +/- Mean +/-M3M4M5M6M8M10M12M14M16M18M20M22M24M27M30M33M36M390.851.492.43.46.29.714.319.426.532.441.351.259.
35、677.394.51171381652.23.86.28.715.925.336.75068.286.2110136159206253312368440-6.99.817.828.341.156.176.5-3.15.58.912.922.836.152.571.697.51191521892202863504325096083.76.410.414.626.642.261.4841141401782202563344085055947100.51.22.44.19.919.534.254.485116.716522528641756772299412850.10.20.50.823.96.8
36、10.917.223.4334557831131541992551.43.16.210.42550.588140217.5313.5437.5602.5774111515202062265034350.20.61.2259.5172842.558.582.5102.5154215290400510660-6.911.8285699157245-1.32.35.510193047-1.94.58.915.236721262003104336058321070154721022856366447460.40.81.72.7713244061801141572132984025517039102.3
37、5.210.417.54284147235.5363.55097079741244181024503335427555450.5123.38162846.570.5941331872473504706458251065NOTES:1. The Clamping Forces sp ecified are equal to 75% of the Proof Load of the Property Classes of bolts as specified in WA 950.2. The Clamping Forces specified for PC 4.6 and 4.8 are equa
38、l to 75% of the Proof Load for PC 4.6 as specified in WA 950.3. The Applied Torques may not be suitable for assembly torques.Table 2. Dimensions of test washersNominal Sizeof BoltInternal Diameterfor Bolt TestingInternal Diameterfor Nut TestingThicknessMax. Min. Max. Min. Min.M3M4M5M6M8M10M12M14M16M
39、18M20M22M24M27M30M33M36M393.84.95.97.19.511.514161820.522.724.726.730.733.936.939.942.93.74.85.86.99.311.313.815.817.820.322.524.526.530.533.536.539.542.53.384.485.486.628.6210.7713.2715.2717.2719.2721.3323.3325.3328.3331.3934.3837.6240.623.24.35.36.48.410.51315171921232528313437400.450.70.91.41.41.82.32.32.72.72.72.73.73.73.74.44.45.4
