Calculating a bolt’s clamping force. a 200 ton machine is capable of producing a maximum clamping force equivalent to a total of 200 tons. The clamping force works anywhere as long as it is within clamping stroke range. 5/16" -18 3/8"-16 1/2"- 13 5/8"-11 3/4"-10 10,000 9,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000 1,000 0 SAE Grade 2 Bolts SAE Grade 5 Bolts SAE Grade 73 SAE Grade 84 Tensile Size Bolt Stress Tensile Proof Clamp2 Tensile Proof Clamp2 Clamp2 2 Dia. Be aware that the shaft collar moves when you tighten its clamp bolt. They are of two types, metric flange bolts and metric hex bolts. Clamping force is responsible for keeping any joint intact. When various factors are typed into the Input cells, Excel will calculate results automatically. Use a Torque Calculator. Clamping Force Calculator Clamping force refers to the force applied to a mold by the clamping unit of an injection molding machine. During the bolt tightening process, the length of the bolt increases and it behaves like an extension spring. This online metric bolt torque calculator is used to find … With the smaller bolt, a larger percentage of the input energy is being converted to strain energy in the bolt/screw, which means more clamping force. Where, Kj – joint spring rate. Metric Bolt Torque Calculator. Calculation of a bolted connection with prestress. Obviously, this cross-sectional area is different for each size of bolt. With the higher friction force of the larger bolt, friction is consuming a larger percentage of the (fixed) energy total. Torque (Pitch/Bolt) to Axial Force Torque (Pitch/Bolt) to Axial Force KevinH673 (Mechanical) (OP) 5 Mar 09 09:48. Step-by-step illustrated examples show how to use the spread sheet tools to optimize bolted joint designs. The maximum pretension set by the calculation procedure so that when the separation load is applied to the joint the stress in the bolt is 95% of yield. Normally, the force rating is stated in tons, e.g. 37)Bolt head dimension across flatsThread pitchouter thread radiusinner thread radiusmean thread radiusEffective radius of rubbing surface against which head/nut bearsCoefficient of friction between screw and nut threadCoefficient of friction at head/nut bearing collarThread Lead (equals thread pitch for single thread screws)Angle of thread at mean radiusThread angle at bearing surfaceAngle between tangent to tooth profile (on the loaded side) and a radial lineThread ConstantBolt preload (load parallel to screw axis)Efficiency of the screw mechanism (ratio of useful work out to work in)Torque to stretch BoltThread Torque (torsional load in the bolt to stretch the bolt and overcome thread friction)Torque to overcome thread frictionTorque to overcome collar frictionJoint pretension constants to compare with other threadsTypical K factors for comparison purposesSteel Thread Condition0.30 as received, stainless on mild or alloy 0.20 as received, mild or alloy on same0.16 cadmium plated0.14 molybdenum-disulphide grease0.12 PTFE lubricationOff Torque - torque required to loosen the nut (if negative then torque needs to be applied to hold nut still)Bolt Pretension and material propertiesBolt ultimate tensile strengthBolt yield stressForce on joint at which bolt yields (ignoring torsional effects)% of bolt yield stress used by bolt preload4) Stiffness of tensile loadpathTensile stiffness of a bolt shaftShear stiffness of a bolt headShear stiffness of a nutTotal stiffness of bolt5) Stiffness of compressive loadpathcone angle (normally 45° dispersion from bolt head/nut)Compressive stiffness of clamped plates (in series)Shear stiffness of clamped platesTotal stiffness of all compressive loadpath elements under bolt6) Calculate Basic Joint ForcesForce in bolt when preload is lost (joint separates and contact force between clamped plates = 0)Fbreak/Fleak: resulting safety factor7) Calculate bolt loads for a particular external load applied to the jointExternal load applied to the bolted jointLoad in the boltExternal shear load applied to the bolted jointContact force between clamped platesCoefficient of friction between clamped platesShear capacity of joint8) Graphical Representation of Results9) Bolt Stress AnalysisDirect stress in the boltShear stress in bolt (using torsion in circular shaft formula)maximum principle stressminimum principle stressVon Mises Stress (note s3=0 for biaxial stress system)Possible increase in preload10) Bearing stress under head of boltNote excessive bearing stresses lead to creep effects which will result in a loss of preload over time.This relaxation is a function of:Typically the bearing stress should not exceed the clamped plate yield stress.Maximum bearing Stress11) Joint deflections and nut rotation.Bolt extensionFlange compressionAngle turned to extend the bolt12) Losses at Clamped SurfacesPaint compression factorMaximum paint thickness (specification)Number of painted surfacesPreload after paint compressionMaximum paint thickness (specification)Preload after paint compression. 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