Bolt size mm, pitch mm, bolt hex mm, strength grade nm. Increase the torque to twothirds following the pattern shown above. Then hand tighten till they are snug against the flanges. Tightening torque for stainless steel screws please use in. Bolt tightening table table 14 table 15 figure 21 1.
Measured frfs show that there is no effect of bolt preload above 10 nm tightening torque figure 6. The anchoring bolts have not been changed from the nominal value. Standard manufacturing practices for the installation and tightening of fasteners shall apply to all fasteners which. The material is en 5052 t5, which is an aluminium alloy which has rp0,2 on 60 mpa, which isnt that much. Surface condition torque adjustment factors plain steel, as supplied x 1. For torque controlled tightening, achieving the right preload is dependent upon the correct tightening torque being specified.
Shobergs efforts it is now gaining wide acceptance in other industries, such as automotive, in critical application like engine head bolts and connecting rod bolts. Start the tightening procedure by lubricating the nuts and bolts. Technical data proper bolt axial tightening force and. There are several ways of securing parts and components to. The torque values given in the table are simply an equivalent to hand tightening using a podger spanner. Standard, and updated referenced australian standards. Screw tightening is carried out in order to stop objects from moving to fix them. There r tabels for 8,8 screws, but the strength of the alloy is only 60 mpa so i wonder if i should use less.
Approximate values for metric co threads vdi 2230 bossard group bolt torque chart pdf zenam vtngcf org iso bolt torque chart zenam vtngcf org approximate values for metric co threads vdi 2230 bossard group. Shear bolts are designed to fail under predetermined loads. Always replace shear bolts with identical property class. An bolt torque for oil free cadmium plated steel nuts and bolts inch. Torque control method bolt tightening is controlled by specific torque value. Heating method tightening is controlled by the variation of the elongation before and. Suggested tightening torque1 values to produce corresponding.
Do not use these values if a different torque value or tightening procedure is given for specific application. Torque specifications are shown either as an exact figure, or a specific range. Underover tightening of fasteners can result in costly equipment failure or personal injury. For critical applications, as determined by the engineering project, either the recommended torque or a torque that is unique to the application shall be clearly identified and specified on the engineering documentation. The sci recommends that generally, torque on ordinary bolts need not be checked. There may be different specifications for different size bolts, bolts in different positions, tightening bolts in several stages, or a cold engine vs. As mentioned above, the tightening torque is for practical reasons the criteria normally used to specify the prestress in the screw. Only applicable to shaft screws with metric standard and fine threads acc. The torque, or the moment of force, can be measured either dynamically, when the screw is tightened, or statically, by checking the torque with a torque wrench after tightening. Jan 24, 2018 tightening torque chart for metric bolts by reza 24 jan, 2018 leave a comment chart for sae metric bolts wrench sample bolt torque chart templates in pdf suggested tightening torque values metric co threads vdi 2230. Extreme caution should be used when using a formula for torquetension relationships. Reference values for tightening torque nordlock washers wedgelocking system.
The torque turn tightening method has been the required procedure for tightening structural bolts for many years. Increase the torque to full torque following the pattern shown above. This approach uses both tightening torque and removal torque measurements. Breakout torque when loosening bolts a torque value higher than the tightening torque is. 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.
Torque control and torqueangle control tightening methods using torque to indirectly control a bolt s preload is by far the most popular controlled tightening method. Pocket guide to tightening technique this booklet provides an introduction to the technique of using threaded fasteners for assembling components, the ap. Tightening torque hex bolts the tightening torque values given in the above table serve only as a guide. This work reveals preload is proportional to tightening torque minus removal torque and that taking this torque difference subtracts out friction. Coefficient 44 45 rs 3 tohnichi torque handbook vol. Tightening torque chart for sae metric bolts wrench free 6 sample bolt torque chart templates in pdf suggested tightening torque values fan disc corporation approximate values for metric co threads vdi 2230 bossard group. Ffmaxfu to adopt % of the minimum required tightening torque, the level that prevent loosening, as the tightening torque. When tightening, always use the correct sequential bolt order for the flange. Modal analysis has been performed for increasing bolt tightening torque levels, from 0 to 25 nm the nominal value in steps of 5 nm. Graduate theses and dissertations iowa state university capstones, theses and dissertations 2018 tightening the large diameter anchor bolts of sign. Metric bolts minimum ultimate tensile and proof loads minimum ultimate tensile and proof loads for metric bolts with coarse or fine threads. Qinitial tightening force and tightening torque a b technical data proper bolt axial tightening force and proper tightening torque technical data strength of bolts, screw plugs and dowel pins 3549 3550 dd 35493550 10. Custom bolt tightening solutions standard product bolt tightening solutions we are very aware that there are many diverse and specialised types of bolted joints being used throughout the industrialised world.
The purpose of tightening screws is to fix one object to another object. 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. This is due to its simplicity and its widespread understanding by all engineers. 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. Tightening the large diameter anchor bolts of sign, signal. Iso metric hexagon bolts and screws products grades a and b. Ratio between measuring torque and tightening torque approximate value obtained by experiment table 31. Fasteners the torquing of stainless steel fasteners your guarantee of quality industrial fasteners. 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. Preload and tightening torques for stainless steel fasteners coarse metric threads. If an air wrench is used make sure the pressure is set to the minimum. Custom bolt tightening solutions we aim to provide special tensioner solutions within one week of receiving the enquiry.
Metric bolts head and wrench sizes ansiso, din and jis bolts. It should be noted that these figures are based on the first tightening of single assemblies in isolation. To adopt 70 % of the breaking torque as the tightening torque for screw joints. The final tightening sequence is achieved smoothly and slowly. Jan 10, 2016 start the tightening procedure by lubricating the nuts and bolts. Tests with bolts, nuts, lock nuts, inserts and locking inserts are provided to assess this approach, and the results show. Clamp loads estimated as 75% of proof load for specified bolts. Standard maintenance practice dictates that mechanics add this value to the specified torque. Technical data suggested tightening torque1 values to produce corresponding bolt clamping loads notes. Torque control and torqueangle control tightening methods. 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.
Tightening torques for stainless steel 304 and 316 metric bolts grade grade a270 and a470 a280 and a480 recommended assembly torque recommended assembly torque to include 70% proof load to include 70% proof load. Without the proper analytical tools and information, specifying the correct torque can be. If lubrication is to be applied to the nutbolt,multiply the recommended torque by the appropriate factor shown in the table on page 7. Tightening test torque these sizes are not included in din iso 272 note. Recommended assembly torques steelmasters bolts, nuts. Clampload is only a estimated number, there maybe situations where the engineer calls for the bolts to be tensioned to a different value. I have an aluminium detail with some helicoil holes m6, m8, m10 and m12. Metric bolts tightening torques typical maximum recommended thightening torques for metric bolts. Boltmasters pty ltd recommended assembly torques author. Follow any special instructions or multistep directions carefully to assure correct final torque. The bolts is 8,8 what tightening torque should i use. Metric bolts tightening torques engineering toolbox.
These formulae may be used for bolts outside the range of the tables, m torque lbf. Use specified bolts and nuts, tightening them to the torques specified in this. Recommended maximum bolt loads and torque values metric coarsethreads 3. 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. T the purpose of tightening screws is to fix one object to another object. Torquing tightening flanged joints in which torsional loads are applied to the bolts causing the bolt to stretch, due to the relative movement between the nut threads. Recommended maximum bolt loads and torque values unc threads.
If torque values are required, then the values shown in the above table may be used. Tightening torque values are calculated from the formula t kdp, where t tightening torque, lbin k. And grade g flange nuts lock nut standards from ifi100 requirements. The importance of tightening torque most engineers already know the importance of a high preload in maintaining joint integrity. In reference to the spanner test torque as per din iso 17111 column, we explicitly point out that these are minimum guarantee values. Lubricated bolts and reduced torque lubrication effect on bolt tension and torque. Alternatively,use the torque tension calculator on the norbar website which enables fastener and friction conditions to be modified with ease.
Torque diameter threads per inch tpi lbf lbft 14 20 736 3. Tightening torque for stainless steel screws please use in heatedup condition the half of the values shown. Torque has been converted into ftlbs by dividing the result of the formula by 12. Stainless steel fasteners preload and tightening torques. Alternatively, use the torquetension calculator on the norbar website which enables fastener and friction conditions to be modified with ease. Tightening torque tightening torque tightening torque tightening torque bolt clamping force lbs. Perform one final pass on each bolt working clockwise from bolt 1, at the full final torque. Values calculated using industry accepted formula t kdp where t torque, k torque coefficient dimensionless, d nominal diameter inches, p bolt clamp load, lb. One of the central problems of using threaded fasteners for.