TORQUE-TENSION REFERENCE GUIDE - Fastenal

1 TORQUE-TENSION REFERENCE GUIDEP rinted in Supply Part Number: 9702365 AS 06/14 torque PosterFor additional technical information, contact Fastenal Engineering at Dia. (in.)Threads per inch307 AASTM A307 Grade ASAE J429 Grade 5 SAE J429 Grade 8F N LG9 FNL Grade 9 Clamp Load(Lbs.)Tightening TorqueClamp Load(Lbs.)Tightening TorqueClamp Load(Lbs.)Tightening TorqueClamp Load(Lbs.)Tightening TorqueK = = = K = = = K = = = K = = = Thread Series 1/4 2085932 in-lbs37 in-lbs43 in-lbs202961 in-lbs76 in-lbs86 in-lbs10 1in-lbs286486 in-lbs107 in-lbs122 in-lbs143 in-lbs3357101 in-lbs126 in-lbs143 in-lbs168 in-lbs 5/16181416667588334212515717820947191772 212512955531207259294346 3/8 16209210 ft-lbs1 1 ft-lbs13 ft-lbs494019 ft-lbs23 ft-lbs26 ft-lbs31 ft-lbs697426 ft-lbs33 ft-lbs37 ft-lbs44 ft-lbs817431 ft-lbs38 ft-lbs43 ft-lbs51 ft-lbs 7/16142870161821677730374249956842525970 1121449617082 1/2 1338312427329046455764751277164809010614 9697594106125 9/16124912353946115996582921091637592115 13015419193108135153180 5/8

2 1161024854641440890113128150203401271591 8021223840149186211248 3/4 1090308596113213221602002272673010122628 232037635281265331375441 7/8 9124671361551822943625832236542941556364 4555156064870742653360471018163552042322 7338616386483547644545175456817729096389 963979990510651-1/4726166409463545537866 7284095211218722010901363154518171022291 2781597181021301-3/8 6311825366077156409688111021249146910393 9142917682025238212182616752094237327921 -1/2637942711806949779911170146216571950 1264731897237126883162148237222427793150 3706 Fine Thread Series1/428231970 in-lbs87 in-lbs99 in-lbs116 in-lbs327498 in-lbs123 in-lbs139 in-lbs164 in-lbs3837115 in-lbs144 in-lbs163 in-lbs192 in-lbs5/16243702139174197231522619624527 832761252302873253833/824559921 ft-lbs26 ft-lbs30 ft-lbs35 ft-lbs790530 ft-lbs37 ft-lbs42 ft-lbs49 ft-lbs926535 ft-lbs43 ft-lbs49 ft-lbs58 ft-lbs7/16207568334147551068447586678125 23556878911/2201019751647285143967290102 12016873841051201419/1618129407391103121 18268103128146171214121201511712015/8181 6317102127144170230361441802042402700016 92112392813/4162377617822325329733566252 315357420393432953694184927/814324792843 5540347445853401502568669537434705886667 8411443343433542614722611906127658671020 71720717896101611951-1/41259548744930105 5124196565120715091710201211318214151768 200423581-3/8

3 1272967100312541421167211832416272034230 5271213868619072384270132781-1/212877471 3161645186521941422922134266830243557166 7782502312735444169 TORQUE-TENSION RELATIONSHIP FOR A307A, GRADE 5, 8 & 9 BOLTSL ocknut SizeThreads per inchSteel Hex LocknutSteel Hex Flange NutGrade CFNL Grade 9 Grade FGrade GClamp Load (lbs.)Tightening TorqueClamp Load (lbs.)Tightening TorqueClamp Load (lbs.)Tightening TorqueClamp Load (lbs.)Tightening TorqueminmaxminmaxminmaxminmaxCoarse Thread Series1 in-lbs144 in-lbs136 in-lbs5/16184719192251553120727733421571 9847192212803 ft-lbs37 ft-lbs7/16149568455911214496567773747956 852661/213127716990149697510090465772127 71801019/1612163751001301919310814411599 82103163751151465/8112034013818023840149 19914408113143203401592013/4103010124532 03528126535321322200253301012823577/8941 5563945154870742656818545175917726389963 98521-1/876869583710958051690612081-1/47 872201181154510222912781704 Fine Thread Series1/428327490 in-lbs5/1624522618026161252113063

4 Ft-lbs7/16201068443621252350731/22014396 669616873771129/161818268941372141211016 15/81823036132192270001552253/4163356623 1336393432703937/81445853368535537434316 2711461190561816717206579561-1/812770157 9411559026893113541-1/412965651106160911 318212971886 ELECTRODEPOSITED ZINC & LUBRICATED PREVAILING- torque ALL-METAL TYPE NUTSN ominal Dia. (mm) Load(lbs)Tightening TorqueClamp Load(lbs)Tightening TorqueClamp Load(lbs)Tightening TorqueClamp Load(lbs)Tightening TorqueK = = = = = = = = = = = = in-lbs23 in-lbs27 in-lbs122829 * Tightening torque (in-lbs through M8; M10 & over ft-lbs)METRIC FASTENERSN ominal Size or Basic Screw inchTensile Stress Area(sq.)

5 In.)ASTM A574 Clamp Load (lbs)Tightening TorqueK = = = Thread Series# in-lbs# # # # # # # ft-lbs43 ft-lbs51 ft-lbs7 Thread Series # in-lbs# # # # # # # # ft-lbs49 ft-lbs58 ft-lbs7 A574 SOCKET HEAD CAP SCREWSN ominal A193 B7 Threads per inchClamp Load(lbs)Tightening TorqueK= (ft-lbs.)K = (ft-lbs.)K = (ft-lbs.)K = (ft-lbs.)Coarse Thread Series1 in-lbs94 in-lbs5/161841291551942192583 ft-lbs7/16148372374652611/21311175567079 935/811177981111391581853/41026339198247 2803297/89363623183984515301847702477596 6767951-1/876010867684595811271-1/477631 89541192135115901-3/86909471251156317722 0841-1/261106641660207523522767UN8 Thread Series1-1/8862248700 ft-lbs875 ft-lbs992 ft-lbs1167 ft-lbs1-1/48787279841230139416401-3/8897 13813361670189222261-1/28117483176222032 4972937 Fine Thread Series 1 in-lbs5/162445731712142432863

6 Ft-lbs7/16209349415158681/22012596637989 1055/818201571261571782103/4162937122027 53123677/8144012135143949758511453541535 6697588921-1/81267388758948107412641-1/4 128449410561320149617601-3/8121035341424 1779201723731-1/212124506186823342646311 3 ASTM A193 B7 Nom DiaThreadsper inch18-8 and 316 Stainless Steel Silicon BronzeMonelBrass2024-T4 AluminumDryLubricatedCoarse Thread ft-lbs7 Thread ft-lbs7 STEEL AND NON-FERROUS FASTENERS (INCH SERIES)Nominal SizeAlloy Steel Socket Head Other Configurations torque (in-lbs.)SizeInch Flat Head Button HeadShoulder Screw Low-Head# # # # # # # # STEEL LOW HEAD SOCKET HEAD CAP SCREWN ominal Dia. (mm)PitchTorque (in-lbs through M8; M10 & over ft-lbs) OR A4 METRIC STAINLESS STEEL FASTENERSCAUTION: All material included in these charts is advisory only, and its use by anyone is voluntary.

7 In developing this information, Fastenal has made a determined effort to present its contents accurately. Extreme caution should be used when using a formula for torque /tension relationships. torque is only an indirect indication of tension. Under/over tightening of fasteners can result in costly equipment failure or personal :1) 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 tensile strength. 2) For A307A, J429 Grade 5 and 8, FNL Grade 9, EcoGuard , A574, A193 B7, Class , , , and externally thread fasteners and Prevailing torque All-Metal Nut chart, the torque values were calculated from the formula torque =KDF, whereK is the estimated torque coefficient (for full details contact K = when using EcoGuard coated nut, bolt and washerK = for lubricated conditions including EcoGuard , some oil, tapping fluid, = for some anti-seize, thread lockers, and some plain conditionsK = for zinc and dry conditionsK = is listed for A193 B7, which would be used for some general PTFE coatingsWhen using zinc plated lubricated with wax prevailing torque lock nuts.

8 The K value can vary between Use Prevailing torque All-Metal Nut chart if using this style of nut. D = Nominal Diameter F = Clamp Load For J429 Grade 5 and 8, FNL Grade 9, A574, Class , , and , the clamp loads are listed at 75% of the proof loads specified by the standard. For A307 Grade A, 75% of 36,000 PSI is utilized. A193 B7 uses 75% of the yield strength. The prevailing torque lock nut clamp loads are listed at 75% of the proof loads specified for the appropriate grade bolt: Grade C SAE J429 Grade 8, FNL Grade 9 FNL Grade 9 bolt, Grade F SAE J429 Grade 5, Grade G SAE J429 Grade 8. 3) With the exception of the F835 Countersunk and Button Head, Alloy Steel Socket Shoul-der and Alloy Steel Low Head Socket Head Cap Screw, torque values for inch series charts up through and including 5/16-in diameter are in inch-pounds; diameters 3/8-in and larger are in foot-lbs.

9 torque values for metric fasteners up through and including M8 are in inch-pounds; diameters M10 and larger are in foot-lbs. 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 as-received screws in rigid joints when torqued with standard hex keys; all are listed in ) Stainless Steel and Non-Ferrous are suggested maximum torque values based on actual lab ) Stainless steel fasteners tend to gall while being tightened. The risk of galling or thread seizing can be reduced by: using lubrication, tightening fasteners with low RPMs and without interruptions, applying only light pressure, and avoiding prevailing torque lock nuts when possible.

10 CONVERSION FACTORS:To convert inch-pounds (in-lbs) to Newton meters (Nm), multiply by convert foot-pounds (ft-lbs) to Newton meters (Nm), multiply by convert pounds (lbs) to Newtons (N), multiply by convert inches (in) to millimeters (mm), multiply by : When using Zinc Plated (lubricated with wax) Top Lock Nuts, the K value can vary be-tween If using API bolting requirements, refer to applicable API specification for tightening torque values. These recommendations are for non-gasketed metal-to-metal joints.