In many scenarios, torque settings are determined by the bolt diameter alone. Extreme caution should be used when using a formula for torque tension relationships. Engineering fundamentals of threaded fastener design and analysis. The thing that is confusing me is the table 1m reference values for calculating target torque values for lowalloy steel bolting based on target prestress of 345mparoot area. Values calculated using industry accepted formula t kdp where t torque, k torque coefficient dimensionless, d nominal diameter inches, p bolt clamp load lbs. Free torque euipment, calibration services download. Maximum tightening torque to preload a bolt metric thread. Hytorc bolting software flange bolt torque calculator. The installation instructions of the packing used should always be followed in detail. Insert screw characteristics and calculate torque and the tool 3d model will be showed. The generated torque is the torque that should be applied to the gland nuts.
Lubricated bolts and reduced torque lubrication effect on bolt tension and torque. Example required torque for tightening a imperial bolt. Astm a490 covers heavy hex structural bolts from 12 inch diameter through 112 inches diameter and are made of alloy steel. Bolt tightening technical data 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. Look up the optimal torque for various combinations of bolt diameter, thread type, and grade or class. The bolts shall be tightened by torque control, using the antiseize lubricant shall be used such as molykote or equivalent, before installation. Maxpro is considered an essential business and is open during the covid19 crisis. The relation between applied torque and axial force or load in a bolt can be calculated as. This online metric bolt torque calculator is used to find the torque of the ecoguard, lubricated and dry metric bolts. Quality checklist, torque guide, a325490 torque tension specs, stud bolt to nut chart, squarehex drive working torque. Bolt sciences torque program example calculation inchlb. Naturally m24 bolts take more force to tighten than m16 bolt. Boltup is hydratights simple to use web based calculator, built upon the informate calculation engine, providing reliable, repeatable bolt loads. The above calculators can not be copied or reproduced without written.
It takes more force to tighten a 3410 bolt than to tighten a 31816 bolt because it is larger in diameter. Breakout torque cannot be accurately calculated, however, depending on conditions it can take up to 2 12 times the input torque to breakout. Informate our advanced calculation and procedure software. Also in some cases achieving an even torque is just as important for a proper seal that will last over a long period of time. This is mainly due to corrosion and deformations in the bolt and nut threads. They are of two types, metric flange bolts and metric hex bolts.
Bolt torque calculator calculate required bolt torque. F tensile force, in lbs c tightening torque, in nm c. Bolt target torque asme pcc1 boiler and pressure vessel. If lubrication is to be applied to the nut bolt,multiply the recommended torque by the appropriate factor shown in the table on page 7.
Ez calc bolting calculator, enerteqs oline tool for estimating required torque values. Torque control method bolt tightening is controlled by specific torque value. Bolt stress window, displays bolt stress, bolt load and % of bolt yield. It should also be realised that some torque wrenches are. Engineering fundamentals of threaded fastener design and. There may be different specifications for different size bolts, bolts in different positions, tightening bolts in several stages, or a cold engine vs. How to calculate the tightening torque of bolt quora. Bolt torque, axial clamp force, bolt diameter calculator. Tests have indicated that torque tensio for structural bolts easily vary by as much as 40%. The amount of force on a fastener is called as torque. These torque and load values are for guidance only.
Over tightening these bolts can damage the timing cover and the gaskets or composite seals. Modern fugitive emissions standards require a different approach to sealing valves with packed stuffing boxes. It is a function of the materials frictional characteristics, which are based on surface finish, coatings and so on. Bolt sciences torque program example calculation inch. The torque values in table v have been calculated as noted in the footnotes, by using formulas from reference 3. No two bolts respond exactly the same to a given torque.
Store service applications support search search contact us. Tightening the nut stretches the bolt, which increases the load on the gas ket. The program tightening of bolts helps you to find or check the tightening procedures of threaded joints using the relationship between torque, clamp load, friction and the property class of the fastener. Valve torque calculator for ios free download and software. The long bolts that go into the engine block will have a different torque values then the short ones that thread into the cover. This fastener bolt torque calculator will estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions. Bolt torque calculator general technical knowledge. Common bolt torque values can be looked up, but finding an accurate reference isnt always easy. The torque required for a 34 dry steel bolt to achieve this tension can be calculated as. How to calculate the tightening torque of bolts ultra torq. The rotation of a bolt torque at some point causes it to stretch tension. Norbar has devised easytouse online calculators that support the correct application of torque in three key areas.
The remaining tightening force is consumed in friction in the screw joint 40% of the torque to overcome the friction in. Bolt torque can be checked with a tool such as a torque wrench, but without a value as a guideline, a torque wrench offers no. This calculator is based on the vdi 2230 guideline. Idms integrity data management system the complete package for managing bolted joints from cradle to grave.
T the purpose of tightening screws is to fix one object to another object. Even experienced tradesmen over or undertorque bolts. Bolt science providing solutions to bolting problems. Bolt torque calculator determining proper torque to bolt. These estimated torque values are derived from the standard torque formula torque kdf utilizing a standard freespinning nut nonlocknut with a proof strength equal to or greater than the tensile strength of the bolt. For this reason it is crucial to tighten packing with a calculated force that keeps the balance between low emission levels and acceptable stem friction. Methods of tightening bolts bolt tightening and quality control case study torque tightening vibration loosening of bolts strength of threaded fasteners bolted joints containing gaskets the importance of preload the joint decompression point bolt crosstalk and the need for a tightening sequence tightening the nut or the bolt head. K factor is a torque coefficient between bolt and receptacle. Bolt torque calculator determining proper torque to bolt bayou. The web application can be used on any mobile device so you can easily make calculations onsite, without having to carry a brochure around with you. The bossard online converters are used for converting different units of measure, such as lengths, hardnesses, pressures etc. Astm a193 b7 astm a307 astm a320 l7 astm a325 astm a354 bc astm a354bd astm a449 astm a490 sae grade 2 sae grade 5 sae grade 8. 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. When using the torque in this tool and following the installation instructions of the packing, the leak level of the packing is guaranteed.
Astm a490 bolt torque chart the astm a490 is a specification for the bolts set by the astm international, a voluntary standards development organizations that sets technical standards for materials. An overtorqued bolt that is stretched beyond its elastic limit is severely weakened, diminishing its. They also have a web site dedicated to training, have a look at the site contains training material and resources. A mistake in this calculation could cost tens of thousands of dollars, never mind the time and hassle of replacing broken equipment. These bolts are categorized into three grades, grade a headed bolts, grade b headed. Elongation is measured by a micrometer, ultrasonic, or an embedded gauge sensor in a bolt. Calculator tightening torque to preload a bolt tribologyabc. The description of tightening calculator tightening of bolts the program tightening of bolts helps you to find or check the tightening procedures of threaded joints using the relationship between torque, clamp load, friction and the property class of the fastener. The below estimated torque calculations are only offered as a guide. Alternatively,use the torque tension calculator on the norbar website which enables fastener and friction conditions to be modified.
Glossary of fastener and related terms torque convertor conversion program for torque units methods of tightening bolts bolt tightening. This tool calculates the gland bolt torque for valves that are packed with chesterton style 1622 low emission packing or chesterton style 1724e low emission sealing sets. Online converters and calculators for fasteners bossard group. Use to determine torque, bolt load and percent yield of maximum load of bolts. Underover tightening of fasteners can result in costly equipment failure andor personal injury. To download boltup, or for a free 7 day trial of the informate bolt load calculation software go to. Lubricated bolts and reduced torque lubrication effect on bolt tension and torque metric bolts tightening torques typical maximum recommended thightening torques for metric bolts metric steel bolts grades and property classes metric steel bolts, screws and studs proof and tensile strength. Torquelator by nordlock torquelator calculates preload and the corresponding torque for bolted joints secured with nordlock original washers and nordlock xseries washers. The bolt torque formula the formula that expresses the relationship between the. Say you have a 8 inch wrench and figure you are applying 4 pounds of force on the wrench centered at 6 inches from the center of the nut. It takes more force to tighten a 3410 bolt than to tighten a 3816 bolt it is larger in diameter. The calculator recommends the best torque values and bolt loads for your job as well the recommended bolting pattern based on the bolting system you are using and. It is essential to know how to calculate the tightening torque of bolts to ensure your application works safely, without breaking.
Comparing the two examples below a and b it will be noted that the same resultant torque can be achieved with a lower force if the distance from the nut bolt is increased. 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. Free torque euipment, calibration services download resources. Input the calculations can be performed for tightening into the elastic.
Bolt torque torque is the turning force measured in newton metre nm applied to tighten turn the nut on a bolt. When loosening bolts a torque value higher than the tightening torque is normally required. Most accurate bolt torque calculator given its geometry and thread diameter, using. The calculator is generic an can used for imperial and metric units as long as the use of units are consistent. K constant d diameter of bolt m, in f axial bolt force or load n, lb. Copyright 19982016 futek advanced sensor technology, inc. Bolt torque calculator load cell, torque sensor, force.
In my case the bolt i have used has got 550mpa min yield strength section ii, part d, thus according to 12. Torque window, displays torque and defines coefficient of friction load graph window, displays bolt stress over a 3 stage time period bts takes the complexity out of bolt tightening calculation. Quality checklist, torque guide, a325490 torquetension specs, stud bolt to nut chart, squarehex drive working torque. Unit conversion to assist international measurement definitions.
Unit conversion to assist international measurement definitions torque extension for setting correct values. Torque tightening analysis results analysis of a 12 inch unf bolt fastener thread details thread details. The specified method of bolt tightening is equally applicable to coated, galvanized and ungalvanized bolts. Flange bolt torque sequence and torque table a complete. It also takes different thread and under head friction into account.
Pdf bolt torque tightening procedures mohammed mujahed. A correctlytightened bolt shares the preload with workpieces. Improvised torque wrench improvised torque wrench with luggage scale. Use of its content by anyone is the sole responsibility of that person and they assume all risk. The final tightening sequence is achieved smoothly and slowly. Iso 724 metric threads dimensions of metric threads according iso 724. The torque angle curves can also provide the necessary information to properly qualify the capability of tightening tools to properly tighten a given fastener.
Truthfully, product information rarely supplies torque values. Bolt tightening table table 14 table 15 figure 21 1. Torque specifications are shown either as an exact figure, or a specific range. Torque tension to identify precise levels of torque to be applied for individual applications. Jun 12, 2012 p clamp load or bolt s desired tensile load generally 75% of yield strength above three factors affect how much tension occurs when a given amount of tightening torque is applied. Follow any special instructions or multistep directions carefully to assure correct final torque.
Running torque should be included in the values listed in the tables because any torque puts shear load on the bolt. Ez calc bolting calculator an oline tool to estimate required torque values. Even experienced tradesmen over or under torque bolts. Futek bolt torque calculator bolt torque calculators.
This tool calculates the gland bolt torque for valves that are packed with chesterton style 1622 low emission packing or. It requires the entry of the stuffing box inner and outer diameter, the stud diameter and number of studs and the entry of the lubricant used when tightening the valve. The converters are divided into topic areas to enable the most efficient selection possible. Given here is the bolt torque chart for the astm a307 bolts. Torque settings refer to the amount of torque that must be applied to a bolt in order to tighten it precisely, without under or over tightening, both of which can lead to torque loss and other issues. Torque is the result of multiplying the value of force applied by the distance from the point of application. The astm a307 is an astm international standard for carbon steel bolts and studs ranging from 14 inches through 4 inches in diameter which is set by the standards organization astm international. However, only about 10% of the torque applied is transferred into clamping force. Metric bolts tightening torques engineering toolbox. The required bolt clamping force for a joint is 20000 lbs.
The torque used to tighten a bolt is consumed by overcoming the frictio and washer about 60%, overcoming the friction between bolt thread and nut threads ab providing energy to elongate the bolt about 10%. The official hytorc app gives you instant access to torque charts, safety and operational videos, product manuals, service center locations and our comprehensive bolt load calculator. Apply suitable axial tension it is best to do axial tension control for tightening screw, but actually it is difficult to measure. Calculator maximum tightening torque to preload a bolt. Torksense torque tightening by nut factor method, torksensedemo. Fasteners bolts, nuts and threaded rods torque, tension and loads. The above calculators can not be copied or reproduced without written permission from futek advanced sensor technology, inc. Torque tightening lets you determine the optimal torque to suit your application. In this guideline the torque required it is defined by the following expression. Bolts that are fully or partially threaded, with washers and nuts are called as metric bolts. The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load. Several factors affect how much tension occurs when a given amount of tightening torque is applied. Newton metre nm applied to tighten turn the nut on a bolt.
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