414Visit us on the WEB @ EBNinc.comEvansville, IN812-477-0077Jasper, IN812-482-5105Vincennes, IN812-882-4090Henderson, KY270-830-0077Owensboro, KY270-684-0877Mt. Vernon, IL618-244-7156Evansville, IN812-477-0077Jasper, IN812-482-5105Vincennes, IN812-882-4090Henderson, KY270-830-0077Owensboro, KY270-684-0877Mt. Vernon, IL618-244-7156Evansville, IN812-477-0077Jasper, IN812-482-5105Vincennes, IN812-882-4090Henderson, KY270-830-0077Owensboro, KY270-684-0877Mt. Vernon, IL618-244-7156Tightening Torque Guide (Figures are based in ft., lbs. unless noted*)U.S./Metric Conversion EquivalentsSizeGrade 5Grade 5Grade 5Grade 5Grade 8Grade 8Grade 8Grade 8N.C. PlainN.C. PlatedN.F. PlainN.F. PlatedN.C. PlainN.C.PlatedN.F. PlainN.F. Plated1/48 ft. lbs.76 in. lbs.*10 ft. lbs.87 in. lbs.*12 ft. lbs.9 ft. lbs.14 ft. lbs.10 ft. lbs.5/16 17 ft. lbs.13 ft. lbs.19 ft. lbs.14 ft. lbs.25 ft.lbs.18 ft. lbs.27 ft. lbs.20 ft. lbs.3/831 ft. lbs.23 ft. lbs.35 ft. lbs.26 ft. lbs.44 ft. lbs.33 ft. lbs.49 ft. lbs.37 ft. lbs.7/1650 ft. lbs.37 ft. lbs.55 ft. lbs.41 ft. lbs.70 ft. lbs.52 ft. lbs.78 ft. lbs.58 ft. lbs.1/276 ft. lbs.57 ft. lbs.85 ft. lbs.64 ft. lbs.106 ft. lbs.80 ft. lbs.120 ft. lbs.90 ft. lbs.9/16109 ft. lbs.82 ft. lbs.122 ft. lbs.91 ft. lbs.153 ft. lbs.115 ft. lbs.172 ft. lbs.129 ft. lbs.5/8150 ft. lbs.112 ft. lbs.170 ft. lbs.128 ft. lbs.212 ft. lbs.159 ft. lbs.240 ft. lbs.180 ft. lbs.3/4266 ft. lbs.200 ft. lbs.297 ft. lbs.223 ft. lbs.376 ft. lbs.282 ft. lbs.420 ft. lbs.315 ft. lbs.7/8430 ft. lbs.322 ft. lbs.474 ft. lbs.355 ft. lbs.606 ft. lbs.454 ft. lbs.668 ft. lbs.501 ft. lbs.1644 ft. lbs.483 ft. lbs.705 ft. lbs.529 ft. lbs.909 ft. lbs.682 ft. lbs.955 ft. lbs.746 ft. lbs.1-1/8794 ft. lbs.596 ft. lbs.890 ft. lbs.668 ft. lbs.1288 ft. lbs.966 ft. lbs.1444 ft. lbs.1083 ft. lbs.1-1/41120 ft. lbs.840 ft. lbs.1241 ft. lbs.930 ft. lbs.1817 ft. lbs.1363 ft. lbs.2012 ft. lbs.1509 ft. lbs.1-3/81470 ft. lbs.1102 ft. lbs.1672 ft. lbs.1254 ft. lbs.2382 ft. lbs.1787 ft. lbs.2712 ft. lbs.2034 ft. lbs.1-1/21950 ft. lbs.1462 ft. lbs.2194 ft. lbs.1645 ft. lbs.3161 ft. lbs.2371 ft. lbs.3557 ft. lbs.2668 ft. lbs.Based on IFI 5th edition technical data N-12/N-16, using equation (1) and a torque coefficient, K=0.20 for non plated steel fasteners and K=0.15 for plated fasteners.These figures represent an estimate of torque (torque being the measurement of friction, not tension) required to induce a given preload (clamp load) in a bolt for non-critical applicationsonly. For critical or special applications where greater control is desired this should be experimentally determined. This applies to washer faced or double chamfered hex nuts (or bolts, ifbolt is torqued) having a width across flats of appoximately 1.5 times the nominal diameter and having threads free of interference.Because of the many interrelated variables that directly or indirectly affect friction, such as surface texture, type of coating or finish, lubrication, speed of tightening, human error, etc., it ispossible to experience as much as +/- 25% deviation in preload (clamp load) with the use of a torque wrench.CAUTION: LUBRICATED FASTENERS (PLATED OR OTHERWISE) ARE TO BE TORQUED AT A LOWER VALUE (LUB. COLUMN), OTHERWISE EXCESSIVE CLAMPLOADS AND FAILURE DUR-ING INSTALLATION WILL RESULT.USERS OF THIS CHART ASSUME FULL RESPONSIBILITY OF APPLICATION.DISCLAIMER: All material included in this guide is advisory only, and its use by anyone is voluntary. Reliance on the contents for any purpose by anyone is at sole risk of that person andEvansville Bolt & Nut is not responsible for any loss, claim or damages arising there from. In developing this information, Evansville Bolt & Nut has made a determined effort to present itscontents accurately.QuantityToIntoMultiplyToIntoMultiplyConvertByConvertByLengthInch (in.)Millimeter (mm)25.4mmInch0.03937Feet (ft.)Millimeter (mm)304.8mmFeet0.00328AreaSquare Inch (sq. in.)Square Millimeter645.16sq. mmsq. in.0.00155(sq. mm)VolumeGallonLiter3.785LiterGal.0.2642Cubic InchCubic Centimeter16.3871Cubic FootCubic Meter0.0283ForcePound (lb.)Newton (N)4.448Nlb.0.2248PressurePound/sq. in. (psi)Pascal (Pa)6895MPapsi145.1Mega Pascal (MPa)0.006895TorqueInch Pound (in. lb.)Newton Meter (N m)0.113N min.- lb.8.851Foot Pound (ft. lb.)Newton Meter (N m)1.356N mft.-lb.0.738Other common conversions: 1N = 1 kg • m/s2- 1 Pa = 1 N/m2- 1 MPa = 1N/mm2Example: To convert length to mm, multiply total inches by 25.4Fraction/Decimal/MetricFractionDecimalMillimeter1/64.0156250.3971/32.031250.794.03941.03/64.0468751.1911/16.06251.5875/64.0781251.984.07872.03/32.093752.3817/64.1093752.778.11813.01/8.1253.1759/64.1406253.5725/32.156254.011/64.1718754.366.15754.03/16.18754.763.19695.013/64.2031255.1597/32.218755.55615/64.2343755.953.23626.01/4.256.35017/64.2656256.747.27567.09/32.281257.14419/64.2968757.5415/16.31257.938.31508.021/64.3281258.33411/32.343758.731.35439.023/64.3593759.1283/8.3759.52525/64.3906259.92.393710.013/32.4062510.31927/64.42187510.716.433111.07/16 .437511.11329/64.45312511.50915/32.4687511.906.472412.031/64.48437512.3031/2.512.700.511813.033/64.51562513.09717/32.5312513.49435/64.54687513.891.551214.09/16.562514.28837/64.57812514.684.590615.019/32.5937515.08139/64.60937515.4785/8.62515.875.629916.041/64.64062516.27221/32.6562516.669.669317.043/64.67187517.06611/16.687517.46345/64.70312517.859.708718.023/32.7187518.25647/64.73437518.653.748019.03/4.7519.05349/64.76562519.44725/32.7812519.844.787420.051/64.79687520.24113/16.812520.638.826821.053/64.82812521.03427/32.8437521.43155/64.85937521.828.866122.07/8.87522.22557/64.89062522.622.905523.029/32.9062523.01959/64.92187523.41615/16.937523.813.944924.061/64.95312524.20931/32.9687524.606.984325.063/64.98437525.00311.025.4
415Visit us on the WEB @ EBNinc.comEvansville, IN812-477-0077Jasper, IN812-482-5105Vincennes, IN812-882-4090Henderson, KY270-830-0077Owensboro, KY270-684-0877Mt. Vernon, IL618-244-7156Evansville, IN812-477-0077Jasper, IN812-482-5105Vincennes, IN812-882-4090Henderson, KY270-830-0077Owensboro, KY270-684-0877Mt. Vernon, IL618-244-7156Evansville, IN812-477-0077Jasper, IN812-482-5105Vincennes, IN812-882-4090Henderson, KY270-830-0077Owensboro, KY270-684-0877Mt. Vernon, IL618-244-7156Tightening TorquesFor Metric Bolts, Screws And NutsRef: Manufacturer’s CatalogFailure of threaded fasteners due to over-tightening can occur by bold shank fracture or by stripping of the nut and/or bolt’s thread.A bolt or screw assembled with a nut of the appropriate class is intended to provide an assembly capable of being tightened to thebolt proof load without thread stripping occuring.The torque value to be set for a particular size of screw is dependent upon:1) Material of the screw2) Parent material (steel, non-ferrous metal or plastic)3) Whether the screw is untreated or plated4) Whether the screw is dry or lubricated5) The depth of the threadTables below are given for informational use only. The exact torque values are found by tests based upon work experience.TIGHTENING TORQUES - Untreated Screw (Black Finish) FRICTION Coefficient 0.14TIGHTENING TORQUES - Electrically Zinc Plated FRICTION Coefficient 1.25PLEASE NOTE CONVERSION FACTOR: ONE Nm = .7375 Foot Pound One Foot Pound = 1.355818 NmProperty TorqueNOMINAL DIAMETER - COARSE THREADClassMaM 3M 4M 5M 6M 7M 8M 10 M 12M 14M 16M 18M 20M 22M 24M 27M 30M 33M 36M 39Nm0.601.372.704.67.6112239629513018425031547063586511111440ft. lb.0.441.011.993.35.68.116284570951351842323464686378191062Nm1.373.106.1510.517.526518914121529542057072510701450197025303290ft. lb.1.012.294.547.712.91937651031582173094205347891069145218652426Nm1.924.408.6515253672125198305420590800102015102050277035604620ft. lb.1.423.256.381118.426539214622430943559075211131511204226253407Nm2.305.2510.418294387150240365500710960122018102450333042805550ft. lb.1.703.877.61321.33164110177269368523708899133418062455315640935.68.810.912.9Property TorqueNOMINAL DIAMETER - FINE THREADClassMaM8 x 1M10 x 1.25M 12 x 1.25M 14 x 1.5M 16 x 1.5M 18 x 1.5M 20 x 1.5M22 x 1.5M 24 x 2Nm275295150225325460610780ft. lb.193870110165239339449575Nm38731352103154606408601100ft. lb.285399154232339472634811Nm458816025038055077010501300ft. lb.33641181842804055677749588.810.912.9Property TorqueNOMINAL DIAMETER - COARSE THREADClassMaM 3M 4M 5M 6M 7M 8M 10 M 12M 14M 16M 18M 20M 22M 24M 27M 30M 33M 36M 39Nm0.561.282.504.37.110.52136588812117123029543559080010301340ft. lb.0.410.941.843.15.27.71526426489126169217320435590759988Nm1.282.905.759.916.52448831322002753905306759951350183023603050ft. lb.0.942.144.247.312.1 17.7356197147202287390497733995134917402249Nm1.804.108.101423346711718528539055074596014001900258033104290ft. lb.1.333.025.9710.316.9254986.213621028740554970810321401190224413163Nm2.154.959.7016.5274081140220340470660890114016802280309039805150ft. lb.1.593.657.1512.119.92959103162250346486656840123916812278293537985.68.810.912.9Property TorqueNOMINAL DIAMETER - FINE THREADClassMaM8 x 1M10 x 1.25M 12 x 1.25M 14 x 1.5M 16 x 1.5M 18 x 1.5M 20 x 1.5M22 x 1.5M 24 x 2Nm254988140210305425570720ft. lb.183664103154224313420531Nm35681251952954256008001000ft. lb.255092143217313442590737Nm42821502353505107209601200ft. lb.30601101732583765317088858.810.912.9