This standard bolt torque calculator is used to find the maximum torque for the given fractional bolt with the diameter, thread series and standard of the bolt. Stainless steels include both iron and nickelbased chromium alloys. Bolts are used for the transmission of shear forces and combine two or more. Torque tighteningbestpracticeguidanceonlinetrainingbrochure. Most accurate bolt torque calculator given its geometry and thread diameter, using vdi 2230 standard, screw clearance through the specific tool 3d model. Chemical engineering chemical engineering essentials for. The relationship between the tightening torque and.
Bolt torque calculator calculate required bolt torque. T, k, and d, combine to provide the axial clamping force f between. Bolt torque calculator determining proper torque to bolt. Design and behavior of bolted joints quality engineering seminar. Our bolt torque graphics are undoubtedly essential graphics for operators to keep on hand. For bolting specifications that do not have a published proofload, it is usually calculated at 92% of minimum yield strength. The generator can be handcranked or lineoperated to develop a high dc voltage which causes a small current through and over surfaces of the insulation being tested fig.
Applying the proper torque to fasteners in order to induce clamp force is essential in. The following equation is the basic equation for the elastic. Using this calculation module, the listbox allows to select the following cases of application. Fortunately, torque angle signature curves can be obtained for most bolted joints. Figure 2 typical megger test instrument hookup to measure insulation resistance. An bolt torque for oil free cadmium plated steel nuts and bolts inch. Inputting four calculation variables allows the app to determine. Flange bolt torque sequence and torque table a complete bolt tightening procedure. For me, it all started with writing my diary for a student.
Mdesign bolt offers engineers in mechanical and plant engineering the possibility of calculating bolt connections which are subject to high stress in accordance with vdi guideline 2230 systematically and in accordance with the standards. When a bolt is tightened, by applying a torque to the bolt head or nut, the bolt. Installation torque tables for noncritical applications. Bolts can be made from many materials, but most bolts are made of carbon steel, alloy steel, or stainless steel. A prevailing torque is required just to rotate the nut on the bolt. As a reality check if we approximate to a cross sectional area of 7 mm 2 and a load of n that gives a tensile stress of 140 mpa which is below yield even for low tensile steels in this particular context, where torque is known, the thread pitch doesnt come into it as you are calculating based on. Flange joints require proper tightening to avoid the leak of the fluid from the joint. Fastener torque charts guide for prevailing torque lock nut assembly torques cad and wax, grade b, c, and grade g flange nuts lock nut standards from ifi100 requirements torque tension requirements clamp loads for the grade b lock nuts equal 75% of the bolt proof loads specified for sae j429 grade 5, and astm a449 bolts. The calculator is generic an can used for imperial and metric units as long as the use of units are consistent.
A case study in torqueangle tightening bolt science. A case study in torque angle tightening bill eccles bolt science because of space restraints, a manufacturer of construction equipment found that it was not possible to achieve the performance requirements for a high performance joint by using torque tightening. Engineering fundamentals of threaded fastener design and. Once the clamp load is determined, finding the correct torque value for a bolt is one simple calculation away. In preparing this guide to torque values, the following basic assumptions have been made. The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load. If youre looking for the next big thing, futek has a library of over 100 new and innovative ideas to incorporate its load cells, torque sensors, pressure sensors, and multiaxis sensors. Fasteners bolts, nuts and threaded rods torque, tension and loads. Applying torque to a nut is an indirect method of obtaining that bolt stress.
How to calculate required t orque a common method of calculating the required target torque uses the formula below. Astm a193 b7 grade bolts are made of alloy steel, aisi 41404142 quenched and tempered and are intended for use in pressure vessels, valves, flanges, and fittings. Calculation of the frictional torque adjusting nut bearing surface m r. Standard maintenance practice dictates that mechanics add this value to the specified torque.
Torque coefficient torque coefficient between bolt and receptacle. Ez calc bolting calculator an oline tool to estimate required torque values. This fastener bolt torque calculator will estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions. Metric bolts tightening torques engineering toolbox.
Mechanical processes can offer an environmentally friendly and safer option to chemical water treatment. Attendees are required to bring a scientific calculator. See torque force design equations webpage and torque chart page for recommended fastener torque and equation data this fastener bolt torque calculator will estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions. The relation between applied torque and axial force or load in a bolt can be calculated as. Titanium and aluminum bolts have limited usage, primarily in the aerospace industry. By combining the torque angle curves with a few simple calculations and a basic understanding of the. Lubricated bolts and reduced torque lubrication effect on bolt tension and torque. Suggested bolt tightening torque in nm newton metres these torque levels are guideline values for metric standard threads in accordance with din iso 261 and head sizes in accordance with. Bolt tightening table table 14 table 15 figure 21 1.
T torque, foot pounds k nut factor torque coefficient resulting from estimated coefficient of friction d nominal diameter of the bolt, inches f tension, pounds improved torque tension. Iso 724 metric threads dimensions of metric threads according iso 724. The above calculators can not be copied or reproduced without written permission from futek advanced sensor technology, inc. Improvised torque wrench improvised torque wrench with luggage scale. By using this torque calculator, you agree to the following terms and conditions. The f, or force, portion from our torque equation is composed of two major. Asme pcc1 appendix o in addition with wrc 538 can be used to detemine requisite torque for flange bolt during assembly. K factor is a torque coefficient between bolt and receptacle. The following is the calculations one would use to determine the actual torque applied when using an extension or crowfoot. Calculate tension in bolt when subject to a known torque calculate max stress in bolt when subject to a preload and determine its acceptability calculate factor of safety against stripping failure for a known thread engagement determine whether a torque retention device is required calculate nut rotation for a given bolt torque definitions. Fenner drives power transmission and conveying solutions.
There can be as many as 200 or more factors that affect the tension created in a bolt when tightening torque is applied refer to paragraph 2. For stainless steel bolts that are at risk of galling, i would experimentally determine my nut factor, based on the lubricant andor coating that you will actually use. With the welldefined and uniform friction coefficient will it be much easier to calculate the needed tightening torque. Threads per inch 307a astm a307 grade a sae j429 grade 5 sae j429 grade 8 f n l g 9 fnl grade 9 clamp load lbs. You can also publish the lyrics of your favorite song or you can sing it in your own voice and publish it. The proof load itself is usually 85% to 95% of a bolt s yield strength, but the clamp load is significant because it is what ultimately provides the clamping pressure. Suggested tightening torque1 values to produce corresponding bolt clamping loads notes. Installation torque tables for noncritical applications hazel t. T the purpose of tightening screws is to fix one object to another object.
This current usually at an applied voltage of 500 volts or more is measured by the ohmmeter, which has an indicating scale. To calculate an accurate torque, an experimental value is needed called. Ez calc bolting calculator, enerteqs oline tool for estimating required torque values. We have a torque wrench to measure the torque during assembly and a formula to calculate the torque based on the gasket load, but what is the gasket load needed to generate a seal. How do i determine bolt torque for flanged connections. The tensile load a fastener can withstand is determined by the formula p st x as. Tightening torque tightening torque tightening torque tightening torque bolt clamping force lbs. The following torque values are advisory only, and its show more. Calculation of bolts according to vdi 2230 mdesign bolt. Alternatively,use the torque tension calculator on the norbar website which enables fastener and friction conditions to be modified. Look up the optimal torque for various combinations of bolt diameter, thread type, and grade or class. These methods offer engineers, operators and owners the option of replacing corrosive, toxic chemicals with physical or mechanical processes that claim to produce the same or superior results to those obtained by traditional chemical treatment methods often without many of the attendant. Mr only comes into effect if the adjusting nut is pressing on the bearing surface.
The big problem is that the load on the gasket cannot be measured directly and easily during installation. Fenner drives is a global leader in valueadding, problemsolving products for conveying and power transmission applications. In the simple approach of asme pcc1, bolt stress is selected to achieve a desired target gasket stress per equation o1. The tightening torque equals the total torque applied minus the prevailing torque. Bolt tightening sequence or torque sequence is defined in torque tightening procedure. Bolt torque, axial clamp force, bolt diameter calculator. Here, the library includes a wide variety of tools for bolt calculation depending on the use case. Clamp loads estimated as 75% of proof load for specified bolts. The appendix provides two approaches to select appropriate bolt stress and hence torque. Use to determine torque, bolt load and percent yield of maximum load of bolts. Need to find relation between applied torque and bolt preload. Tightening torque values are calculated from the formula t kdp, where t tightening torque, lbin k torque friction. The below online astm a193 b7 bolt torque chart provides tension, torque, tpi information against their corresponding sizes.
Apply suitable axial tension it is best to do axial tension control for tightening screw, but actually it is difficult to measure. Handbook of bolts and bolted joints, edited by john h. Moment of inertia and torque every time we push a door open or tighten a bolt using a wrench, we apply a force that results in a rotational motion about a fixed axis. If you click on the symbol pdf, then the report appears in the pdf format. Bolt tightening 2 bolt tightening 21 various tightening methods various tightening methods 34 22 screw and torque relation formula between screw and torque 35 23 torque coefficient 1 formula of torque coefficient 36 2 the torque coefficient is not stable 36 3 even when the torque is stable, axial tension may vary 36. It is a function of the materials frictional characteristics, which are based on surface finish, coatings and so on.
The electronic pdf version of this document, available free of charge. The bolt is stressed up to the proofload value, and if there is no deformation, elongation, or fracture, then the bolt is deemed to have passed. Tightening torque tightening torque tightening torque tightening torque the torque values can only be achieved if nut or tapped hole has a proof load greater than or equal to the bolts minimum ultimate tensile strength. See torque force design equations webpage and torque chart page for recommended fastener torque and equation data.
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