In this guideline the torque required it is defined by the following expression. The impetus for the preparation of a second edition of the guide to design criteria for bolted and riveted joints has been the enthusiastic reception of the original version and the continued citation for over a decade of that book as a source of information regarding the design of bolted connections. Material yield strength material tensile strength approximate material shear strength oiled. 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. This calculator is based on the vdi 2230 guideline. Insert screw characteristics and calculate torque and the tool 3d model will be showed. Do not use these values if a different torque value or tightening procedure is given for specific application. The tables below reflect the results of many tests to. Here is the bolt torque chart for the astm a193 b7 grade bolts. Torque can also be found by using the vector product of force f and position vector r. See the reference section for details on the methodology and the equations used.
Bolt torque vs clamping load visual aid bolt torque vs clamp load note. F tensile force, in lbs c tightening torque, in nm c. 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. There are several grades under astm a193 namely b7, b8 class 1, b8m class 1, b8 class 2, b8m class 2. Load on machine bolts and cold rolled steel stud bolts under torque stress nominal number diameter area 7,500 psi 15,000 psi 30,000 psi diameter of threads of root at root clamping clamping clamping of bolt per inch of thread of thread torque force torque force torque force. Md 239 the purpose of this guide is to provide the most comprehensive fastening systems information available to the industry. M p x d 5000 these formulae may be used for bolts outside the range of the tables, m torque lbf. 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. Clamp loads for grade c lock nuts equal 75% of the bolt proof loads specified for sae j429 grade 8, and astm a354 grade bd bolts.
Visit our website for the most uptodate product information. Sec8 div1 app2 will cover gasket seating, but does not directly address target bolt torque. Guide to design criteria for bolted and riveted joints second. Lubricated refers to fasteners in the as received condition, which is normally a light preservative oil coating on unplated fasteners and no oil coating on plated fasteners. Bolt torque, axial clamp force, bolt diameter calculator. Fill, sign and download bolt torque chart online on. Torque conversion to bolt tension jedclampett structural aug 09 17.
Metric bolt torque chart pdf vatan metric bolt torque chart pdf vatan metric bolt torque chart pdf vatan metric bolt torque chart pdf vatan. All suppliers give a rosey picture of their equipmentss capability i suppose, but they also deal with the consequences in some way or another, whether it is claims or just loss of future sales. See the instructions within the documentation for more details on performing this analysis. The download for our demo program is packaged in a self extracting exe file that includes an uninstall facility ifwhen you want to cleanly remove the program and associated files from your system. For torque, try sec8 div1 apps and asme pcc1 appendix o. Always replace shear bolts with identical property class. Store service applications support search search contact us. The values shown in the chart are to be used as a midrange guideline.
The intent of this torque table is to find the balance between bolt yield and allowable gasket stress to achieve a longterm reliable seal. In a bolted flange, the applied torque generates the axial load in the bolt. The torque value to use in an application is best obtained by using a calibrated torque wrench or transducer and a skidmorewilhelm type load indicating device to equate actual torque to desired tension. Engineering fundamentals of threaded fastener design and analysis.
Bolt tension corresponding to 65% of proof load recommended assembly torque diameter 1 sae threads per inch tpi lbf lbft grade 5 14 37500 625 grade 8 14 53000 883 to convert kn to lbf. M4 m5 m6 m8 m10 m12 m14 m16 3000 5000 0 20000 45000 45000 90000 therefore for fr n for one gib. The pro per bolt tightening pattern must be followed see installation instruc tions section of the. The below estimated torque calculations are only offered as a guide. Bolt sciences torque program example calculation inchlb. 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. Bolt torque chart template free download formsbirds. By combining the torque angle curves with a few simple calculations and a basic understanding of the. Torque values chart for common bolt sizes n tractor club. This torque table is not intended to communicate the minimum possible torque value to seal gore gaskets. Torque is the turning force measured in footpounds ftlb or inchpounds inlb applied to tighten turn the nut on a bolt. Visit our website for the most uptodate product and technical information.
For ordinary applications like car wheel lugs or headbolts, the manufacturer has the experience to know the torque levels to apply. The bolted joint analysis calculator allows for stress analysis of a bolted joint, accounting for preload, applied axial load, and applied shear load. The user must verify these conditions, as outlined, are appropriate for the specific application. 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. Torque conversion to bolt tension structural engineering. Table 3 suggested torque values and clamp loads for sae. T he torque clampload relationship varies with lubrication used on the bolt lubrication type can be input at the top of the page. The calculator is generic an can used for imperial and metric units as long as the use of units are consistent. How do i determine bolt torque for flanged connections. Tightening torque mai nmm of the grub screw as per bossard t. 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. The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load.
Accepted formulae relating torque and tension,based on many tests are. We have included many standard and hard to find specialty products. Shear bolts are designed to fail under predetermined loads. All other trademarks, service marks and logos used in this website are the property of their respective owners. Nearly all of the torque tension tables which have been developed, including the one shown in. Bolt torque conversion chart pdf torque has been converted into ftlbs by dividing the result of the formula by 12. Torque can be measured during flange assembly with a properly calibrated torque wrench. The user must confirm that torque values do not exceed pipe manufacturers torque recommendation. Torque values chart for common bolt sizes intpi1 n m2 ftlb3 n m ftlb n m ftlb mm x pitch4 n m ftlb n m ftlb n m ftlb 14 20 7. In the real world when clamping force is important,a hydraulic tensioner pulls the stud bolt and then the nut is tightened.
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