Custom bolt tightening solutions we aim to provide special tensioner solutions within one week of receiving the enquiry. The thicker the gasket, the higher the gasket creep which in turn can result in torque loss. Tightening torque tightening torque tightening torque tightening torque bolt clamping force lbs. 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. 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. 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.
It takes more force to tighten a 3410 bolt than to tighten a 3816 bolt it is larger in diameter. Clamp load calculated as 75% of the proof load when specified by the standard. Engineering fundamentals of threaded fastener design and analysis. There are several ways of securing parts and components to. Torque is a computer program that provides a means of determining the correct tightening torque and the resulting anticipated clamp force for a threaded fastener. 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.
The required bolt clamping force for a joint is 20000 lbs. Accepted formulae relating torque and tension, based on many tests are. Tighten toothed or serratedtype lock nuts to the full torque value. Torque control method bolt tightening is controlled by specific torque value. With hydraulic tensioning the bolt is stretched by means of a powerful hydraulic tool to the permissible 90% of the bolts yield strength re. Maintaining specified tightening torques is vital for performing repair work to a professional standard. The final tightening sequence is achieved smoothly and slowly.
Mack e7 engine specs, bolt torques, workshop manuals. Approved torque testing equipment is listed in the catalogue of. It should be noted that these figures are based on the first tightening of single assemblies in isolation. Pdf bolt torque tightening procedures mohammed mujahed. These produce a 90% utilization of the bolt yield strength. Without the proper analytical tools and information, specifying the correct torque can be. The torqueangle curves can also provide the necessary information to properly qualify the capability of tightening tools to properly tighten a given fastener. If lubrication is to be applied to the nutbolt, multiply the recommended torque by the appropriate. If this connection is torque tightened, the bolt can only be used to 70% of its yield strength re because approximately 30% is lost due to torsional stresses induced by the tightening torque.
Mark the position of the tightened bolt, loosen it and read the. Technical data suggested tightening torque1 values to produce corresponding bolt clamping loads notes. In preparing this guide to torque values, the following basic assumptions have been made. Technical data proper bolt axial tightening force and. Friction points should always be lubricated when using the torque tightening method. The importance of tightening torque the problem bolt. The specified method of bolt tightening is equally applicable to galvanised and ungalvanised bolts. Surface condition torque adjustment factors plain steel, as supplied x 1. Set the torque wrench to the 70% torque value and repeat step 2. Tightening torque chart for metric bolts hobbiesxstyle. Iso 724 metric threads dimensions of metric threads according iso 724. Due to many variables that affect the torquetension relationship like human error, surface texture, and lubrication the only way to determine the correct torque is through. Effects of tightening a nut and bolt behaviour youtube. Tightening torque hex bolts the tightening torque values given in the above table serve only as a guide.
Qaxial 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. Alternatively,use the torquetension calculator on the norbar website which enables fastener and friction conditions to be modified. Bolt tightening table table 14 table 15 figure 21 1. Elongation is measured by a micrometer, ultrasonic, or an embedded gauge sensor in a bolt. Tensioning loads and tightening torques chart and guide. Engineering fundamentals of threaded fastener design and. Flange bolt torque sequence and torque table a complete. Torque values for 14 and 516in series are in inchpounds.
Fasteners bolts, nuts and threaded rods torque, tension and loads. Several discussions in this technical section stress the importance of preload to maintaining joint integrity. The importance of tightening torque most engineers already know the importance of a high preload in maintaining joint integrity. The torque angle curves can also provide the necessary information to properly qualify the capability of tightening tools to properly tighten a given fastener. The remaining tightening force is consumed in friction in the screw joint 40% of the torque to overcome the friction in. Suggested tightening torque1 values to produce corresponding. Basic specs are free and open to everyone they usually include engine images, displacement, dimensions and weight, essential bolt tightening torques, plus characteristics of the engine e. Fill in the blanks on the job data sheet showing 30%, 70% and 100% torque values. Make liter cid engine model year rod torque main torque cylinder head bolt torque acura 1.
Bolt size mm, pitch mm, bolt hex mm, strength grade nm. General information on torque specifications the amount of torque applied to a bolt or nut determines the clamp load. Modal analysis has been performed for increasing bolt tightening torque levels, from 0 to 25 nm the nominal value in steps of 5 nm. Apply suitable axial tension it is best to do axial tension control for tightening screw, but actually it is difficult to measure. Improvised torque wrench improvised torque wrench with luggage scale.
Bolt torque calculator calculate required bolt torque. Tighten the bolt further to determine the applied torque. Tightening torque for stainless steel screws please use in heatedup condition the half of the values shown. Torque is a computer program that provides a means of determining the correct tightening torque and the resulting anticipated clamp force for a. The purpose of tightening screws is to fix one object to another object. 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. 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. Several factors affect how much tension occurs when a given amount of tightening torque is applied. Flange joints require proper tightening to avoid the leak of the fluid from the joint. The rotation of a bolt torque at some point causes it to stretch tension.
Bolt torque specs in foot pounds or inch pounds this table is based on a torque coefficient, k0. Tightening torques and the torquetension relationship all of the analysis and design work done in advance will have little meaning if the proper preload is not achieved. 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. This presupposes that the torque wrenches required for this are subjected to a regular inspection. 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. This clamp load is a determining factor in the performance of the assembly. The fatigue strength of bolt under repeated load should not exceed the specified tolerance.
T the purpose of tightening screws is to fix one object to another object. 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, 7984 and 7990. However, only about 10% of the torque applied is transferred into clamping force. 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. These figures represent an estimate of torque torque being the measurement of friction, not tension required to induce given preload clamp load in a bolt for noncritical. 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. Torque is a program which is designed to assist the engineer in the solution of problems related to the torque tightening of threaded fasteners. Screw tightening is carried out in order to stop objects from moving to fix them. Coefficient 44 45 rs 3 tohnichi torque handbook vol. The amount of preload created when torquing is largely dependant on the effects of friction. To view the full content, you will need to purchase the standard by clicking on the buy button. Tightening torque values are calculated from the formula t kdp, where t tightening torque, lbin k. Metric bolts tightening torques engineering toolbox.
There are many methods for measuring preload see table 12. Example required torque for tightening a imperial bolt. Measured frfs show that there is no effect of bolt preload above 10 nm tightening torque figure 6. If lubrication is to be applied to the nutbolt,multiply the recommended torque by the appropriate factor shown in the table on page 7. The importance of tightening torque the problem bolt science. Bolting procedures hydraulic, torque, wrenches, pneumatic. Bolt tightening sequence or torque sequence is key to achieve this.
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 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. Use of its content by anyone is the sole responsibility of that person and they assume all risk. 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. Mar 24, 2014 if this connection is torque tightened, the bolt can only be used to 70% of its yield strength re because approximately 30% is lost due to torsional stresses induced by the tightening torque. Due to many variables that affect the torque tension relationship like human error, surface texture, and lubrication the only way to determine the correct torque is through.
In this video we explain bolt behaviour and elastic limits. Alternatively,use the torque tension calculator on the norbar website which enables fastener and friction conditions to be modified. Approved torque testing equipment is listed in the catalogue of workshop equipment planning documents. The torque required for a 34 dry steel bolt to achieve this tension can be calculated as. Metric bolts head and wrench sizes ansiso, din and. Chart for sae metric bolts wrench sample bolt torque chart templates in pdf suggested tightening torque values metric co threads vdi 2230. Ratio between measuring torque and tightening torque approximate value obtained by experiment table 31. Use specified bolts and nuts, tightening them to the torques specified in this. The anchoring bolts have not been changed from the nominal value. The below estimated torque calculations are only offered as a guide.
Torque table provides the required value for bolt tightening. Principally there are three different torque components. For torque controlled tightening, achieving the right preload is dependent upon the correct tightening torque being specified. Fastener torque specifications 8 sae and metric fastener torque specifications metric plain and zinc plated hex and socket head cap screws torque chart metric plain and zinc plated hex head and socket head cap screws. Resources to help you determine the right solution for your application. The torque applied to a fastener with an antiseize compound pre.