Transcription of Recommended Maximum Torque Values
1 9 Recommended Maximum Torque ValuesMTorque in 2011715619526031241646858570230M 2215821126435242256363479295032M 242022703374495397198091011121336M 27298398497663795106011931491178941M 304055406759001080144016202025243046M 3355073491712231467195622012751330150M 36708944118015731888251728323540424855M 399191226153220432452326936784597551760M 4211391518189825303036404945555693683265 M 4514251900237531673800506757017126855170 M 4817162288286038134576610168648580102967 5M 5222102947368449125895785988421105213263 80M 5627373650456260837300973310950136871642 585M 6034044538567375649076121021361417018204 2290M 6441005466683391101093214576163982049824 59795M 6849636617827111029132341764619851248142 9777100 The information supplied here is intended to be an acceptable guide for normal conditions.
2 For critical applications, further informationand research will be following basic assumptions have been made:a. Bolts are new, standard finish, uncoated and not lubricated (other than the normal protective oil film).b. The load will be 90% of the bolt yield The coefficient of friction is The final tightening sequence is achieved smoothly and lubrication is to be applied to the nut/bolt, multiply the Recommended Torque by the appropriate factor shown in the table on page , use the Torque /Tension Calculator on the Norbar website which enables fastener and friction conditions to be modifiedwith - Total Torque for Calculating the Effect of Torque Wrench ExtensionsM1 = M2 x L1/L2 Where L1 is the normal length and L2 is the extended length, M1 is the set Torque and M2 the actual Torque applied tothe extended lengthL1 normal lengthCentre of handleTorque Conversion Factors1 = = = = = = = UnitsImperial UnitsMetric to beconvertedFormulaeAccepted formulae relating Torque and tension, based on many tests are:-M =P x D60or for metric sizes:-M =P x D5000 These formulae may be used for bolts outside the range of the tables,M = Torque =bolt tension lbfD =bolt = Torque =bolt tension NewtonsD =bolt x = Nl/s x = = x = l/sPressurePowerlbf/in2x = barhp x =kWbar x = lbf/in2kW = x rev/min9546 ExampleThe required Torque on the fastener is130 (M2) but what do you set onthe Torque wrench scale?
3 L1 = 500 L2 = 650(units of length not important, this is a ratio)M1 = 130 x 500/650M1 = 100 See our Torque Unit Converter on the Norbar website and apps for iPhone and Android smartphones.
