Torque value for bolts pdf

Astm a325 is an astm american society of the international association for testing and materials international standard for heavy hex structural bolts. The preferred method for measuring tare torque is to use a dial indicator type torque wrench, but may be measured by approaching the value with a click style torque wrench. Table 3 suggested torque values and clamp loads for sae. An bolt torque for oil free cadmium plated steel nuts and bolts inch. Clamp load calculated as 75% of the proof load when specified by the standard. Bolt sizepitch lubricated with antiseize inlbs nm inlbs nm 1420 91 10 61 7 ftlbs nm ftlbs nm 51618 16 22 11 15 3816 28 38 19 26 71614 45 61 30 41 12 68 92 46 62 91612 98 3 66 89 5811 140 190 91 123 3410 240 325 160 217 789 390 529 260 353 18 580 786 390 529 1 187 715 969 480 651. Tightening torque is not influenced by the bolt length so easy to standardize. Set the torque wrench to 20%, 40%, 80% of final torque value and apply torque in a crisscross pattern. Iso9001certified a2la accredited to iso17025 engineering fundamentals of threaded fastener design and analysis. These formulae may be used for bolts outside the range of the tables overleaf.

The importance of correct torque application cannot be overemphasized. Fastener proof load is sometimes listed in the literature. Over and undertorqueing a bolt can result in premature failure, though most failures are due to under torque. Achieving proper preload levels why superbolt tensioners. 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.

Repeat until bolts have been successively tightened. Below is a list of the recommended tightening torques for 12. Torquetension relationship for astm a193 b7 bolts and studs. Fill, sign and download bolt torque chart online on. Assembly torque is the standard torque or specified torque, plus the tare torque. Lubricate all contact areas of the bolts and washers. Astm a193a193m b8 and b8m class 1 torquetension guide. Torque bolts and nuts in a crisscross sequence using a minimum of three torquing passes and the maximum bolt stress as defined pass 1. The mating of aerospace spec msnasan bolts and nuts to fasteners of other specifications and thread classes can cause problems. Also unlike a standard bolts, which have much looser. The bolt torque table below provides information such as tension, torque, tpi for the heavy structured bolts against its corresponding bolt sizes ranging from 12 to 1 12.

The torque values in table v have been calculated as noted in the footnotes, by using formulas from reference 3. Because of this, bolts with a diameter greater than 1 inch cannot be effectively torqued to capacity with hand tools. And grade g flange nuts lock nut standards from ifi100 requirements. Shear bolts are designed t fail under predetermined loads. In this case the torque value is decided by the size of the bolt. This article includes a table of various torque recommendations. The 20 and 24 standard roof manholes use 16 and 20, 58 bolts respectively. Shear bolts are designed to fail under predetermined loads. There a number of websites that will give bolt torque chart pdf and metric bolt torque chart pdf and these are free to download. Inchpounds value is equal to the largest amount of torque that can be put on the fastener. For bolting specifications that do not have a published proofload, it is usually calculated at 92% of minimum yield strength. 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. Given here is the bolt torque chart for the astm a307 bolts. Torque values for 14 and 516in series are in inchpounds.

Lubricated bolts and reduced torque lubrication effect on bolt tension and torque. Some of the older engines that were manufactured by the oe did not supply a torque value for specific bolts. A bolt torque chart will give the estimated torque calculations. Composite and noncomposites require different torque values. The importance of correct bolt tightening cannot be over emphasized. The bolt is stressed up to the proofload value, and if there is no deformation, elongation, or fracture, then the bolt is deemed to have passed.

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. Use 75% of the specified torque value for plated fasteners. Consequently the torque values quoted can only be regarded as a guide and bench trials. Metric bolt torque chart lists the typical maximum recommendations for tightening torques for metric bolts. Torque specifications recommended torque in foot pounds newton meters sae grade 2 no dashes sae grade 5 3 dashes sae grade 8 6 dashes bolt diameter b wrench size a 8. For when experimental values for nut factors were not available. Bolts are new, standard finish, uncoated and not lubricated other than the normal protective oil film. The bicycle specific torque value chart is also available as a pdf file. General torque specification for bolts, nuts, screws, driving studs, and pipe plugs 12 table 6. Generally the full effort of an ironworker with a ordinary spud wrench is sufficient to tighten the nuts on anchor bolts. Metric bolts head and wrench sizes ansiso, din and jis bolts. The result provides the normal number of g applied to obtain the deceleration. Recommended torque values are calculated figures based upon several factors including friction, bolt diameter and proof stress.

Do not use these values if a different torque value or tightening procedure is given for a specific application. 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. Bolt size, tpi, proof load lbs, clamp load lbs, tightening torque ft lbs. There are several ways of securing parts and components to. All test results are for bolts with single nuts only unless otherwise specified.

This article will discuss the basics of torque and torque wrench use. Torque to a maximum of 30% of the final torque value in accordance with the torque sequence. Fortunately, torque angle signature curves can be obtained for. Boltmasters pty ltd recommended assembly torques author. Common bolt torque values can be looked up, but finding an accurate reference isnt always easy.

Since the torque values are rather conservative, failure is not to be expected when using these charts. General information on torque specifications the amount of torque applied to a bolt or nut determines the clamp load. These bolts are categorized into three grades, grade a headed bolts, grade b headed, heavy hex bolts and grade c nonheaded anchor bolts where astm a307 grades a and b has one inch diameter bolt. Recommended bolt torque table size recommended torque grade 2 grade 5 grade 8 188 ss bronze brass. Make sure that the torque applied is for the size of the bolt shank not the wrench size. Lubed means cleaned, dry bolts, lubricated with standard medium viscosity machine oil. Use 85% of the specified torque value for lubricated fasteners. Torque values calculated from formula tkdf, where k 0. Clamp load calculated as 75% of the yield strength for the b7 specified in astm a193. If your application requires a higher or lower load, usually the standard product torque. To arrive at the correct torque value, several other values must be found first. 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. Flange bolt torque sequence and torque table a complete. Standard maintenance practice dictates that mechanics add this value to the specified torque.

Surface condition torque adjustment factors plain steel, as supplied x 1. Under torque can cause premature wear of nuts and bolts, as well as the parts they secure. Description this section contains information on the correct usage and identification of bolts, flat washers, lock washers, nuts, lock nuts, fittings and torque data. Astm a193a193m b8 and b8m class 1 torque tension guide 14 20 0. Determining the correct torque can however present problems. Bolt tension recommended corresponding to assembly 65% of proof load torque kn nm 7. Engineering fundamentals of threaded fastener design and analysis. Consult the design engineer to determine the proper tightening torque or if pretensioning is required for your. Roof manholes should not present any sealing problems since they see no pressure or media. Torque tightening values for structural steel bolts. Do not use these values if a different torque value or tightening procedure is given for specific application.

Bolt torque calculator determining proper torque to bolt. It should be noted that these figures are based on the first tightening of single assemblies in isolation. Over torque can cause wear or premature failure of a bolt or nut from overstress on threaded areas required practices note. Torque in pound foot or pound inch torque in newton meter nm lubed means cleaned, dry bolts, lubricated with standard medium viscosity machine oil. Suggested assembly torque values the tapped hole or nut must have an equal or greater proof load than the studs minimum ultimate tensile strength. Accepted formulae relating torque and tension, based on many tests are. Tightening torque hex bolts the tightening torque values given in the above table serve only as a guide. The specific torque value should be determined based on fastener size, the aluminum or brass material strength, length of thread engagement, etc. 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 value is usually 75 percent of theoretical yield, to prevent inadvertent yielding of the fastener through torque measurement inaccuracies.

Since the exact yield torque cannot be determined without extensive instrumentation, it is not advisable to torque close to the bolt yield point. How much torque is the right amount is highly dependent on the size of the bolt, the thread pitch, and the surface condition of the threads. To calculate an accurate torque, an experimental value is needed called the torque coefficient or nut factor k. Tare torque for one fastener combination and apply this tare torque value to all similar fasteners. As noted on available charts, torque values should be reduced by 25% for lubricated fasteners to achieve the similar stress as a dry fastener. The bolt efficiency will be low due to wide tolerance of the tension. 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. The question comes up fairly frequently so i put together the various torque values taken from the haynes manual, 9196 version and lt snyders, first edition. Sep 10, 2018 if you are not sure about a procedure, rest and reread the process again. Recommended maximum bolt loads and torque values unc threads.

Bolt torque can be checked with a tool such as a torque wrench, but without a value as a guideline, a torque wrench offers no advantage. Unlike a standard bolt, a washer face is provided under the head to provide a bearing surface when tightened. Installation torque tables for noncritical applications. They should be used on all fasteners unless otherwise specified. Torque may have to be reduced when installing fastener into threaded aluminum or brass. Torque limits recommended for installation bolts loaded primarily in shear maximum allowable tightening torque limits thread size tension type nuts ms20365 and an310 40,000 psi in bolts shear type nuts. Engineering fundamentals of threaded fastener design and analysis by ralph s. This manual contains torque values specifications for various type of hardware used on lycoming engines. After the nut is tightened to the proper torque value.

The values shown in the chart are to be used as a midrange guideline. If measured tare torque value is less than the minimum listed, the lock nut must be replaced. Ptfe coatings, lubrication, and assembly factors can alter these values. In preparing this guide to torque values, the following basic assumptions have been made. Values calculated using industry accepted formula t kdp where t torque, k torque coefficient dimensionless, d nominal diameter inches, p bolt clamp load, lb. Fasteners require a certain torque to fulfill its function and prevent failure. The torque and preload bolt load values given in the catalog tables are the standard values for common uses. Set the torque wrench to 100% torque value and repeat. Torque values for metric fasteners up through and including 4 torque values for f835 countersunk and button head, alloy steel socket shoulder and alloy steel low head socket head cap screw are given for asreceived screws in rigid joints when torqued with standard hex keys. Year engine displacement liters cc engine idvin cylinder head bolts main bearing bolts rod brearing bolts crankshaft damper bolts flywheel bolts manifold spark plugs lug nuts intake exhaust 1999. A55 fastener torque charts imperial has made a concerted effort to provide accurate information in its catalog and on its web site, however imperial assumes no responsibility for the accuracy of the information. These torque values should be used on all fasteners unless otherwise.

Metric bolts tightening torques typical maximum recommended thightening torques for metric bolts. Abstract the objective of this project is to define torque values for bolts and screws when loading is not a concern. Metric bolt torque chart world of printable and chart. Values in this chart are advisory only, all applications vary. There is no torque difference for fine or coarse threads.

Grade 2, 5, and 8 values are for slightly lubricated bolts. Use these values if we supplied equipment with vibrator drives attached. As the use of antiseize is going to vary the friction characteristics of the assembly, the actual torque required will also vary. Check all bolts at 100% torque with a circular pattern. Always replace shear bolts with identical property class. It is reasonable way for tightening control and operation. Engineering fundamentals of threaded fastener design and. There is nothing specific to the newer bikes, like axle nut for ss swingarm or motors bigger than the 900 so feel free to add to it.