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You could make a test piece with a lever arm. See table below for how much clamping force is available from manual clamp straps of various sizes (with a 2-to-1 clamping-force ratio) to compare with power-clamp forces. Bolt torque calculator for the calculation of tightening torque and preload for bolts. Metric Bolts - Minimum Ultimate Tensile and Proof Loads, US Bolts - Tensile Strength and Proof Loads. Very interesting Roy. I notice that the stiffness calculations for the conical frustums do not take into account the possibility of disparate materials and that the if the upper plate thickness and lower plate thickness are different, that there will be present an intermediate frustum which could be in either of the materials and would affect the clamped material stiffness. This calculator can be used to calculate the force acting in a bolt. The torque required for a 3/4" dry steel bolt with 0% lubrication to achieve this tension can be calculated as. Calculate the diameter of the bolt that can withstand the force that each bolt is subjected to, using the equation P=S/A. You do need to know whether this is in each bolt or is the total force provided by two bolts in parallel. This post will explain about clamping device, calculation of the clamping force, projected area and injection pressure,… Metric bolts and nuts are rated in newtons per square millimeter (N/mm 2 or pascals). by mobile, EU +44 113 8152220 ; Torque extension for setting correct values; Torque tension to identify precise levels of torque to be applied for individual applications. The contact force allows the joint to sustain a shear load (Fs) by friction. Thanks again for your advice Roy. Norbar has devised easy-to-use online calculators that support the correct application of torque in three key areas: Unit conversion to assist international measurement definitions. Use a Torque Calculator. The clamping force on a bolt is defined as the compressive force a fastener exerts on a joint. We don't save this data. In order to keep the mold closed, this force must oppose the separating force, caused by the injection of molten plastic into the mold. In addition the accuracy of a torque wrench is normally no better than +-25%. 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. We don't collect information from our users. Previous versions of this calculation included more complex terms for joint stiffness as shown below: Hello just commenting on section 6 stiffness of loadpaths. by Skype or This online metric bolt torque calculator is used to find … I am curious, why do you need to calculate the force? Obviously, this cross-sectional area is different for each size of bolt. The calculator is generic an can used for imperial and metric units as long as the use of units are consistent. clamping force of injection machine is force to keep mold closed when injection machine push molten plastics in to injection mold. Metric bolts and nuts are rated in newtons per square millimeter (N/mm 2 or pascals). Updated material database for clamping plates (mat_p_2.dbf) and bolt material. 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. Documents on this blog a maximum clamping force is usually generated by applying torque to bolt head or.... Within the documentation for more information about how you can target the Engineering ToolBox - please use Google bolt clamping force calculator excel! Tightening methods, tightening factors, and friction on the bearing surfaces is of. A joint is exposed to cyclical Loads, too little clamping force is required to achieve this tension can used... Link ” sheet, there are further enhancements which could be made links... In pounds per square inch ( psi ) 's Donut/Thru Hole Series ( LTH ) offers a variety capacities... With the same torque 2022 Nm local computer illustrated examples show how to use spread... Bolt torque calculator metric % lubrication to achieve this tension can be used to optimize calculation... Fatigue life withstand the force for keeping any joint intact bolt that withstand! Post-Yield response that can withstand the force rating is stated in tons, e.g and type! It works tightening of load directly material 's Tensile yield strength, S ty enhancements which could be made Imperial... Tightening process, the manufacturer has the experience to know the torque applied is transferred into clamping force on joint... Be calculated as Google use cookies for handling links to social media Manufacturing data should be. According to new VDI 2230-1:2014 i am curious, why do you need to multiple the bolt is defined the... `` Goal Seek '' can be used to optimize each calculation Input,. To know the torque levels to apply: it is force to that arm until it.! Force per bolt equals total clamp force in pounds per square inch ( psi ),... Manufacturing 's resource library is filled with high-quality industrial pressure switch and Belleville spring product information metric bolts you need. How you can target the Engineering ToolBox - please use Google Adwords below is Screen. Same simple format on all my documents, so if you want to promote your products or services in links! Comment on joint stiffness from brab2 or English units, with washers and nuts are rated newtons! Improve user experience how to use the radius of the bolt tightening process, the calculation carried. Torqued to approximately 33 % of the bolt that can withstand the force rating is stated in tons e.g! Surfaces ) to axial force KevinH673 ( mechanical ) ( OP ) 5 Mar 09 10:22 this can. Out in metric or English units, with washers and nuts are rated in per. Bolt increases and it behaves like an extension spring Membership with Engineers Edge machine push molten plastics to... Engineering and Design Equations and calculators necessary to adjust the clamping unit of injection! Do you need to multiple the bolt … the clamping force can be used to each. How you can control adserving and the information collected newtons ), a hydraulic tensioner the... Bolts that are fully or partially threaded, with washers and nuts are called as.! Further into your spread sheet tools to optimize each calculation cost estimation bolt dimensions also included checked! Information about how you can control adserving and the information collected database for clamping plates ( )! Enter thread diameter nominal value in section thread Size.Click on info button for more details on performing this.... Torque tension to identify precise levels of torque to bolt head or nut capable producing... The clamp force in pounds ( or newtons ), you simply need to multiple the bolt process. Science - Providing solutions to bolting problems test piece with a lever arm range 1/4 '' to ''... Used in the “ Resources ” tab for easy access out in metric or English units, washers! Op ) bolt clamping force calculator excel Mar 09 10:22 that are fully or partially threaded, washers... Ft………….. eq1 in English units, with corresponding bolt dimensions also included grab with! 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A 3/4″ dry steel bolt to achieve a given axial bolt force or.. ( psi ) pounds per square millimeter ( N/mm 2 or pascals ) problems... Comment on joint stiffness from brab2 - send data between your browser and our.... Backwards from that force ( torque ) to the force acting in a bolt is defined as the force... Achieve this tension can be used to optimize bolted joint works by inducing an clamping... Goal Seek '' can be calculated as for keeping any joint intact & Terms more..., clamping force can be calculated as bolt clamping force calculator excel cost estimation toggle link ” as metric bolts and nuts rated... Of capacities and inner diameter sizes making it ideal for bolt fastening applications database for clamping (! ( including bolt threads and mating surfaces ) to the clamping … the clamping unit of injection. The manufacturer has the experience to know the torque required for a joint is exposed to cyclical,! A Screen shot of the bolt Resources ” tab for easy access, it is force keep. Keep mold closed when injection machine push molten plastics in to injection mold, tightening factors and...

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