Standard, and updated referenced australian standards. 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 din en iso 4762, din en iso 4032, din en iso 4014, and din 9312, 6912. T the purpose of tightening screws is to fix one object to another object. Approximate values for austenitic stainless steel a1 a2 a4. Torque control and torqueangle control tightening methods. Torquetension relationship for astm a193a193m b7 and. The torque applied to a fastener with an antiseize compound pre.
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 pitch mm 1 1. Heating method tightening is controlled by the variation of the elongation before and. The customer must satisfy themselves with the performance of the fastener and validity of the data. For critical applications, the torqueangle method of tightening bolts provides a way of achieving the maximum clamp force in a joint and is often the way forward when torque control proves to be inadequate. Set the torque wrench to the 100% torque value and repeat the crisscross pattern a third time.
Measured frfs show that there is no effect of bolt preload above 10 nm tightening torque figure 6. The bicycle specific torque value chart is also available as a pdf file. A case study in torqueangle tightening bolt science. Suggested tightening torque1 values to produce corresponding. The relation between applied torque and axial force or load in a bolt can be calculated as. You can make ads in the engineering toolbox more useful to you. This article will discuss the basics of torque and torque wrench use. The remaining tightening force is consumed in friction in the screw joint 40% of the torque to overcome the friction in. 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. 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. Mar 12, 2019 it is essential to know how to calculate the tightening torque of bolts to ensure your application works safely, without breaking. Alternatively, use the torquetension calculator on the norbar website which enables fastener and friction conditions to be modified with ease.
This paper presents a novel approach to determine preload in a bolted joint at installation or point of use. S14s38 b35 m12 torque 50 nm torque 80 nm settling time 15 min torque 100 nm 10az cylinder head bolts replace, wash and oil cylinder head bolts. 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. Check all bolts at 100% torque with a circular pattern. The final tightening sequence is achieved smoothly and slowly. Alternatively,use the torquetension calculator on the norbar website which enables fastener and friction conditions to be modified. The torqueangle curves can also provide the necessary information to properly qualify the capability of tightening tools to properly tighten a given fastener. Iso 724 metric threads dimensions of metric threads according iso 724. Elongation is measured by a micrometer, ultrasonic, or an embedded gauge sensor in a bolt. Apply suitable axial tension it is best to do axial tension control for tightening screw, but actually it is difficult to measure. This work reveals preload is proportional to tightening torque minus removal torque and that taking this torque difference subtracts out friction. These formulae may be used for bolts outside the range of the tables overleaf.
Shear bolts are designed to fail under predetermined loads. Underover tightening of fasteners can result in costly equipment failure or personal injury. Bolt size mm, pitch mm, bolt hex mm, strength grade nm. It is extremely important to realize that this tightening value is valid only so long as all of the aspects of the application remain constant. General information on torque specifications the amount of torque applied to a bolt or nut determines the clamp load. Engineering fundamentals of threaded fastener design and analysis. This clamp load is a determining factor in the performance of the assembly. 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. We are passionate about bringing solutions to our customers. When tightening, always use the correct sequential bolt order for the flange. Bolt torque chart 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. When loosening bolts a torque value higher than the tightening torque is normally required.
Improvised torque wrench improvised torque wrench with luggage scale. The bolt torque formula the formula that expresses the relationship between the continue reading how to calculate the tightening. Top of page astm a193 b7 astm a320 l7 astm a354 bc. Recommended maximum bolt loads and torque values unc threads. Use specified bolts and nuts, tightening them to the torques specified in this. Screw tightening is carried out in order to stop objects from moving to fix them. The torqueangle tightening method is known to give a consistently high preload but does involve more care and consideration on the tightening process with the torqueangle tightening method an initial tightening torque is speci. Tests with bolts, nuts, lock nuts, inserts and locking inserts. Breakout torque cannot be accurately calculated, however, depending on conditions it can take up to 2 12 times the input torque to breakout. Tightening torque hex bolts the tightening torque values given in the above table serve only as a guide. This article includes a table of various torque recommendations. Typical values for k with mildsteel bolts in range 14 to 1.
Tighten toothed or serratedtype lock nuts to the full torque value. The torque angle curves can also provide the necessary information to properly qualify the capability of tightening tools to properly tighten a given fastener. Bolt tightening table table 14 table 15 figure 21 1. However, only about 10% of the torque applied is transferred into clamping force. To view the full content, you will need to purchase the standard by clicking on the buy button. The below estimated torque calculations are only offered as a guide. Torque control method bolt tightening is controlled by specific torque value. Threaded fasteners nuts and bolts are used to hold many components to the bike. This approach uses both tightening torque and removal torque measurements. Start the tightening procedure by lubricating the nuts and bolts. Bolting procedures hydraulic, torque, wrenches, pneumatic. 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.
Modal analysis has been performed for increasing bolt tightening torque levels, from 0 to 25 nm the nominal value in steps of 5 nm. Tightening torque chart for metric bolts hobbiesxstyle. 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. Stainless steel fasteners preload and tightening torques. Reference values for tightening torque nordlock washers wedgelocking system. Tightening torque for stainless steel screws please use in. 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. Engineering fundamentals of threaded fastener design and.
If lubrication is to be applied to the nutbolt,multiply the recommended torque by the appropriate factor shown in the table on page 7. Along with our general purpose tensioners and torque wrenches we also offer many industry specific bolt tightening tools and solutions. Tr fastenings will not be held responsible for any failure that may occur from the use of. It is essential to know how to calculate the tightening torque of bolts to ensure your application works safely, without breaking. 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. Then hand tighten till they are snug against the flanges. A mistake in this calculation could cost tens of thousands of dollars, never mind the time and hassle of replacing broken equipment.
Set the torque wrench to the 70% torque value and repeat step 2. Lubricated bolts and reduced torque lubrication effect on bolt tension and torque metric bolts head and wrench sizes ansiso, din and jis bolts metric bolts minimum ultimate tensile and proof loads minimum ultimate tensile and proof loads for metric bolts with coarse or fine threads. The anchoring bolts have not been changed from the nominal value. If an air wrench is used make sure the pressure is set to the minimum. The remaining tightening force is consumed in friction in the screw joint. Preload from tightening and removal torque springerlink. Iso metric hexagon bolts and screws products grades a and b. Always replace shear bolts with identical property class. Extreme caution should be used when using a formula for torquetension relationships.
Fasteners torqueclamp force testing 1 scope this international standard specifies the conditions for carrying out torqueclamp force tests on threaded fasteners and related parts. Tightening of structural joints bolting categories 8. The purpose of tightening screws is to fix one object to another object. Use of its content by anyone is the sole responsibility of that person and they assume all risk. The torque turn tightening method has been the required procedure for tightening structural bolts for many years. The bolt torque formula the formula that expresses the relationship between the. Bolt suppliers sometimes have customers say that their bolts are no.
Do not use these values if a different torque value or tightening procedure is given for specific application. It is applicable, basically, to bolts, screws, studs and nuts made of carbon steel and alloy steel, whose. Fasteners with internal drives and lower head shape. It should be noted that these figures are based on the first tightening of single assemblies in isolation. Lubricated bolts and reduced torque lubrication effect on bolt tension and torque. All material included in this chart is advisory only, and its use by anyone is voluntary. S38 b36s38 b38 m12 torque 20 nm torque angle 60 torque angle 70. The application of bolt tightening method shall be carried in accordance with the following parameters. Due to the fact that fastening applications differ greatly, the above information is for guidance only and is correct to the best of our knowledge. A final circular pass will be made with the torque wrench set at. Bolt torque calculator calculate required bolt torque. This is mainly due to corrosion and deformations in the bolt and nut threads. Pdf bolt torque tightening procedures mohammed mujahed. The tightening device and bolts are specially made.
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