Custom bolt tightening solutions custom detachable bolt tensioners custom hydraulic nuts custom torque wrenches custom torque wrench reaction equipment custom multi stud tensioning systems custom bolt tightening solutions standard product bolt tightening solutions we are very aware that there are many diverse and spe. The following table i to v inclusive set out the tightening torques, for b. An bolt torque for oil free cadmium plated steel nuts and bolts inch. Stud bolts bolting torque tables table 1 astm a193. Standard bolt tightening torque specified torque for standard bolts b3 tightening torque class diameter piteh hexagon head bolt hexagon flange bolt mm mm kgem ftib nm kgem ftib nm 6 1 55 48 in. Analysis of bolt torquing by clement rajendra, pe progress energy, southport, nc 28461 introduction. F tensile force, in lbs c tightening torque, in nm c. Torque is the force used to tighten fasteners or the amount of rotational force that a fastener must be able to withstand before failure. As with every bolt pretensioning method, calibrated wrench may only be performed after all steel plies in a connection have been drawn into firm contact, i. The powermaster bolt tightening software in many cases would recommend a preferred bolt stress based on bolt loads specified in the different bolt flange specifications. The final tightening sequence is achieved smoothly and slowly. Inch series selfsealing screw torque values see section 3. Flange bolt up bolting torque table 1a the torque tables are built on specific assumptions regarding bolt and nut factor. Before using a given torque table, these assumptions should be verified to insure they are appropriate for the specific application.
Bolting procedures hydraulic, torque, wrenches, pneumatic. Tightening torque for stud bolts in cold service according to various astm standards. Elongation is measured by a micrometer, ultrasonic, or an embedded gauge sensor in a bolt. Tightening torque for metric fasteners important notice. Surface condition torque adjustment factors plain steel, as supplied x 1. During maintenance activities in a power plant environment, the plant engineer is often called upon to make decisions concerning bolts in bolted connections in a variety of situations. Stud tensioning can be achieved using a torque wrench. Where the property class differs between the nut and bolt or stud bolt, use the tightening torque specified in the table for the bolt. In the second part, we dive into the torquetension relationship. The first time around tighten to approximately 12 of the final torque, and then repeat the sequence, tightening to. Recent listings manufacturer directory get instant. The bolt head indicates the strength grade, if not nominated use 10. Flange joints require proper tightening to avoid the leak of the fluid from the joint. All personnel that install or tighten fasteners and connectors covered by this specification shall do so in.
Set the torque wrench to the 30% torque value and apply the torque wrench in the crisscross pattern for that particular flange until all bolts have been tightened once. Calibrated wrench bolting method applied bolting technology. Fastener torque charts guide for prevailingtorque lock nut assembly torques cad and wax, grade b, c, and grade g flange nuts lock nut standards from ifi100 requirements torquetension 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. It accounts for the frictional effects in the thread and between the nut face and clamped surface. Bolt tightening torque procedure standard bolt tightening. Fill in the blanks on the job data sheet showing 30%, 70% and 100% torque values. Clamp loads estimated as 75% of proof load for specified bolts. Bolts are new, standard finish, uncoated and not lubricated other than the. Stud bolts bolting torque tables table 1 astm a193 and.
Calibrated wrench bolting method calibrated wrench torque. Tightening torque for metric fasteners welcome to xox bolt. Tightening torque table new standard included nissan rogue service manual general information how to use this manual tightening torque of standard bolts tightening torque table new standard included. All information provided in this document andor presentation is based on data the industrial fasteners institute believes to be reliable and accurate. 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. Structural bolts installation as41001998 working definitions torque is not used as a measure for the tensioning of structural bolting.
Tightening torques for metric bolts of yield strength sy metrique diameter mm 6 8 10 12 14 16 18 20 22 24 27 30 33 36 39 42 45 48 52 56 60 64 68 m6 m8 m10 m12 m14 m16 m18 m20 m22 m24 m27 m30 m33 m36 m39 m42 m45 m48 m52 m56 m60 m64 m68. Friction coefficient stabilizer is not applied to the following boltsnuts. Guide for prevailingtorque lock nut assembly torques cad. Bolts are new, standard finish,uncoated and not lubricated other than the normal protective oil film. Axial tightening force for bolt and fatigue limit the proper axial tightening force for a bolt should be calculated within an elasticity range up to load 70% of the rated yield strength when the torque method is used.
However, use tightening torque without lubricant for the following cases. The boltcalc program determines both tensile stress due to the elongation of the fastener, and the torsional stress due to the applied torque. If youre very posh, like me, and youve got a thing about tightening torque, you might have a torque wrench with a dial. Tightening torque hex bolts the tightening torque values given in the above table serve only as a guide. In preparing this guide to torque values, the following basic assumptions have been made.
Figures represent the max torque of the bolt the tightening torque is 8090% of chart figures the recomended loosening torque is up to 150% of the tightening torque load sockets must comply with the appropriate standards e. Stainless hex bolts recommended tightening torque nm. This software can also be used on non standard bolted joints. It should be noted that these figures are based on the first tightening of single assemblies in isolation. As mentioned above, the tightening torque is for practical reasons the criteria normally used to specify the prestress in the screw. Bolt torque pdf torque control is done as a substitute characteristic. Calibrated wrench bolting method calibrated wrenchtorque. Torque control method bolt tightening is controlled by specific torque value.
Department of transportation federal highway administration by the. 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 bolt s minimum ultimate tensile strength. The energy taken to twist the nut up the thread of the bolt measured in nm. Flange bolt torque sequence and torque table a complete. Guide for prevailing torque lock nut assembly torques cad. Deciding whether a particular tightening torque is optimal is often problematic. T the purpose of tightening screws is to fix one object to another object. Bolt size mm, pitch mm, bolt hex mm, strength grade nm. Summarizes different tightening methods, and explains the relationship between bolts and torque, torque coefficient, how to determine tightening torque, tightening torque tolerance, and axial tension stability tightening procedure.
Bolt tightening sequence or torque sequence is defined in torque tightening procedure. Unless otherwise specified, standard metric series fasteners shall be torqued to the applicable values. This is a method to acquire the target axial force by turning the bolt or the nut by the set turning angle degrees from the state in which the bolt and the nut are completely seated. Pocket guide to tightening technique this booklet provides an introduction to the technique of using threaded fasteners for assembling components, the application of power tools for the assembly and the influence of tool selection on the quality of the joint. Shown is the bolt tightening sequences for typical circular flanges. The fatigue strength of bolt under repeated load should not exceed the specified tolerance. Fc29 2 proper bolt axial tightening force and proper.
Tighten toothed or serratedtype lock nuts to the full torque value. To view the full content, you will need to purchase the standard by clicking on the buy button. Paint removing nut size m6 and m8 for fixing with weld bolt. Determination of required torque by estimating the friction coefficient. Do not fully tighten the bolts the first time around as this can tilt the flange out of parallel. 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. The tables below lists the maximum permissible tightening torques and the resulting maximum preload for standard hex head bolts and socket head cap screws based on. Glossary of fastener terms the bolt supply house ltd. Bolt size, tpi, proof load lbs, clamp load lbs, tightening torque ft lbs. Recommended maximum bolt loads and torque values metric coarsethreads 3. If youre very posh, like me, and youve got a thing about tightening torque, you might have a torque wrench with a dial on it which actually shows the torque as it increases.
The purpose of tightening screws is to fix one object to another object. Torque controlled tightening with precision power screwdriver. If lubrication has been applied to the bolt andor the nut other than the normal protective. The association of german engineers bolt calculation theory tolerance tightening setting procedure for screwdriver remarks. Torque values chart for common bolt sizes n tractor club. Bolt tightening table table 14 table 15 figure 21 1. Before using a given torque table, these assumptions should be verified to insure they are.
Set the torque wrench to the 70% torque value and repeat step 2. Flange bolt torque sequence and torque table a complete bolt tightening procedure. The american society of mechanical engineers or asme provides standards for how much torque fasteners should withstand and proper torquing during assembly. This assembly torque is designed to achieve a preloading in the bolt expressed in. Friction coefficient stabilizer is applied to the new standard boltsnuts. The first time around tighten to approximately 12 of the final torque, and then repeat the sequence, tightening to the suggested torque limit.
Use tightening torque with lubricant for the new standard boltsnuts in principle. The torque tables are built on specific assumptions regarding bolt and nut factor. There are several ways of securing parts and components to. 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. Flange bolt torque sequence and torque table a complete bolt tightening procedure flange joints require proper tightening to avoid the leak of the fluid from the joint. Tribological aspects of the selfloosening of threaded. As mentioned above, the tightening torque is for practical. Tighten plastic insert or crimped steeltype lock nuts to approximately 50 percent of the dry torque shown in the chart, applied to the nut, no to the bolt head.
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