Product (Dimensions And Tolerances) Standards For Threaded .
Product (Dimensions and Tolerances) StandardsforThreaded FastenersByK. P. ShahEmail: kpshah123[at]gmail.com (Please replace [at] with @)Committed to improve the Quality of LifeFor more information on mechanical maintenance, visit www.practicalmaintenance.netThe information contained in this booklet represents a significant collection of technicalinformation about product standards for threaded fasteners. This information will help toachieve increased reliability at a decreased cost. Assemblage of this information will providea single point of reference that might otherwise be time consuming to obtain. Most ofinformation given in this booklet is mainly derived from literature on the subject from thesources as per the references given at the end of this booklet. For more information, pleaserefer them. All information contained in this booklet has been assembled with great care.However, the information is given for guidance purposes only. The ultimate responsibility forits use and any subsequent liability rests with the end user. Please view the disclaimeruploaded at http://www.practicalmaintenance.net.(Edition: March 2021)1Product (Dimensions and Tolerances) Standards for Threaded Fastenerswww.practicalmaintenance.net
imensions of Bolts, Screws and Nuts as per ASMEDimensions of Machine Screws and Machine Screw NutsDimensions of Bolts, Screws and Nuts as per ISODimensions of Slotted and Cross Recessed Screws as per ISOProduct Standards for Structural FastenersProduct Standards for Socket Cap Screws and Socket Screw KeysProduct Standards for Set ScrewsProduct Standards for StudsProduct Standards for Prevailing Torque Type NutsProduct Standards for Plain (Flat) WashersProduct Standards for Spring WashersProduct Standards for Tooth (Star) Lock WashersReferencesPage No.341524354759728495108118132138For more information on threaded fasteners, please visit www.practicalmaintenance.net2Product (Dimensions and Tolerances) Standards for Threaded Fastenerswww.practicalmaintenance.net
IntroductionMost industrial threaded fasteners are covered by two basic standards: one for materials andproperties called materials standards; the other, for dimensions and tolerances calledproduct standards. Information about product standards is given in this booklet. Forinformation about materials and properties, please see booklet titled Mechanical Propertiesand Identification Markings for Threaded Fasteners (at www.practicalmaintenance.net).There are two main systems for measuring weights and distances: the metric system andthe imperial system. The primary standardization organizations for the metric system productstandards for fasteners are the International Organization for Standardization (ISO) and theGerman Institute for Standardization (DIN) whereas for the imperial fasteners they areAmerican Society of Mechanical Engineers (ASME). It may be noted that ASME is inclinedtowards setting codes and standards for mechanical devices, the American NationalStandards Institute, abbreviated as ANSI accredits standards for the products, processes,systems, services, and resources of the United States. Though there are many ASME andISO product standards for threaded fasteners, important information about only someproduct standards for education purpose is given in this booklet. For users of IndianStandards, important information on some Indian Standards (IS) is also given.It may be noted that each metric standard is product specific. For example, ISO 4014 (DIN931) is the specification for hexagon head bolts (Product grades A and B) and ISO 8765(DIN 960) is the specification for hexagon head bolts with metric fine pitch thread (Productgrades A and B). The specification used to produce the corresponding inch series fastenersis ASME B18.2.1. However, the ASME B18.2.1 specification covers the dimensionalrequirements for nine product types of inch series bolts and screws. Therefore, one muststate the pattern of the desired product; in this case, hex bolts. Under the metric system,each of the product types would have its own individual standard.As there is a move towards the adoption of ISO fastener standard in place of metric fastenerstandard by ASME, ASTM and SAE, information on metric fastener standard by ASME,ASTM and SAE is not given in this booklet.Note:It may be noted that in ISO standards, comma (,) is used as a decimal marker.3Product (Dimensions and Tolerances) Standards for Threaded Fastenerswww.practicalmaintenance.net
Dimensions of Bolts, Screws and Nuts as per ASMEImportant information about dimensions and tolerances for bolts, screws and nuts as perASME standards B18.2.1 and B18.2.2 is given in this chapter.ASME B18.2.1ASME B18.2.1 covers the dimensional requirements for inch series square head, hex, heavyhex, and askew head bolts; hex (hex cap), heavy hex, hex flange, and lobe head screws;and lag screws recognized as American National Standard.TerminologyIn this standard, “short bolt” or “short screw” means a bolt or screw of a diameter-lengthcombination that is required to be threaded for full length, whereas “long bolt” or “long screw”means a bolt or screw of a diameter-length combination that is not threaded for full length.Body Length, LBBody length is the distance measured parallel to the axis of the bolt or screw from theunderhead bearing surface to the last scratch of thread or, for rolled threads, to the top of theextrusion angle.Grip Gaging Length, LGGrip gaging length is the distance measured parallel to the axis of the bolt or screw from theunderhead bearing surface to the face of a noncounterbored/noncountersunk standard GOthread ring gage assembled by hand as far as the thread will permit. Thus, it is the distancefrom the bearing face to the first full form (full profile) thread.For fasteners not threaded to full length, grip gaging length represents the minimum designgrip length of the joint (minimum thickness of materials which can be clamped) excluding thewasher thickness.Thread LengthThread length is the length from the extreme point of the bolt or screw to the last complete(full form) thread. For bolts and screws in this standard, other than lag screws, the NominalThread Length (LT) is a reference dimension intended for calculation purposes only.General Data for Both Bolts and ScrewsWidth Across FlatsWidth across flats of head is the overall distance measured perpendicular to the axis ofproduct between two opposite sides of the head.Head HeightThe head height is the overall distance measured parallel to the axis of product from the topof the head to the bearing surface and shall include the thickness of the washer face whereprovided.4Product (Dimensions and Tolerances) Standards for Threaded Fastenerswww.practicalmaintenance.net
Bolt or Screw LengthThe bolt or screw length is the distance measured parallel to the axis of product from thebearing surface of the head to the extreme end of the bolt or screw, including the point if theproduct is pointed.Unless otherwise specified, bolts need not be pointed. Products designated as screws, withthe exception of lag screws, are required to have a chamfered point.ThreadsThreads on all products in this standard, except lag screws, shall meet the requirements ofASME B1.1. For lag screw thread dimensions, please see the standard.Thread series on all bolts and screws may be coarse (UNC), fine (UNF), or 8 thread series(8 UN), except askew head bolts, which shall be unified coarse (UNC) only, and lag screws,which are specified in the standard.Unless otherwise specified, size limits for standard external thread, Class 2A apply prior tocoating. The external thread allowance may be used to accommodate the coating thicknesson plated or coated parts, provided that the maximum coating thickness is no more thanone-fourth of the allowance.DesignationBolts and screws shall be designated in the sequence by: product name; nominal size(fractional or decimal equivalent); threads per inch (omit for lag screws); product length(fractional or two-place decimal equivalent); material, including specification wherenecessary; and protective finish, if required.For Example: Hex Cap Screw per ASME B18.2.1. 1/2 - 13 4. ASTM A 354 Grade BD, plainfinish.It may be noted that in above example, the screw will be provided Class 2A thread asnothing is specified in the designation. As nominal size is 1/2 in. and threads per inch is 13,the screw has unified coarse (UNC) thread. Thread series (UNC) is not required to bespecified since threads per inch is specified.BoltsFollowing tables show dimensions of hex bolts and heavy hex bolts.5Product (Dimensions and Tolerances) Standards for Threaded Fastenerswww.practicalmaintenance.net
Dimensions of Hex Bolts (All dimensions are in inches)Nominal SizeFull Size Width Across Flats,WidthHead Height, HRadius of Threador BasicBodyAcrossFillet, RLength,*FProductDiameter, ECorners, GLTDiameterMax. Min. Basic Max. Min. Max. Min. Basic Max. Min. Max. Min.Nom.1 0.2500 0.260 0.237 7 16 0.438 0.425 0.505 0.484 11 64 0.188 0.150 0.03 0.010.75045 1 0.3125 0.324 0.2980.500 0.484 0.577 0.552 7 32 0.235 0.195 0.03 0.010.8751623 1 0.3750 0.388 0.360 9 16 0.562 0.544 0.650 0.6200.268 0.226 0.03 0.011.000847 5 0.4375 0.452 0.4210.625 0.603 0.722 0.687 19 64 0.316 0.272 0.03 0.011.1251681 3 0.5000 0.515 0.4820.750 0.725 0.866 0.826 11 32 0.364 0.302 0.03 0.011.250245 0.6250 0.642 0.605 15 16 0.938 0.906 1.083 1.033 27 64 0.444 0.378 0.06 0.021.50083 1 0.7500 0.768 0.729 11 8 1.125 1.088 1.299 1.2400.524 0.455 0.06 0.021.750427 0.8750 0.895 0.852 15 16 1.312 1.269 1.516 1.447 37 64 0.604 0.531 0.06 0.022.000811.0000 1.022 0.976 11 2 1.500 1.450 1.732 1.653 43 64 0.700 0.591 0.09 0.032.2503 11 8 1.1250 1.149 1.098 111 16 1.688 1.631 1.949 1.8590.780 0.658 0.09 0.032.500411 4 1.2500 1.277 1.223 17 8 1.875 1.812 2.165 2.066 27 32 0.876 0.749 0.09 0.032.75013 8 1.3750 1.404 1.345 21 16 2.062 1.994 2.382 2.273 29 32 0.940 0.810 0.09 0.033.00011 2 1.5000 1.531 1.470 21 4 2.250 2.175 2.598 2.48011.036 0.902 0.09 0.033.25015 8 1.6250 1.658 1.591 27 16 2.438 2.356 2.815 2.616 13 32 1.116 0.978 0.09 0.033.50013 4 1.7500 1.785 1.716 25 8 2.625 2.538 3.031 2.893 15 32 1.196 1.054 0.12 0.043.75017 8 1.8750 1.912 1.839 213 16 2.812 2.719 3.248 3.099 11 4 1.276 1.130 0.12 0.044.00022.000 2.039 1.96433.000 2.900 3.464 3.306 111 32 1.388 1.175 0.12 0.044.25021 4 2.2500 2.305 2.214 33 8 3.375 3.262 3.897 3.719 11 2 1.548 1.327 0.19 0.064.75021 2 2.5000 2.559 2.461 33 4 3.750 3.625 4.330 4.133 121 32 1.708 1.479 0.19 0.065.25023 4 2.7500 2.827 2.711 41 8 4.125 3.988 4.763 4.546 113 16 1.869 1.632 0.19 0.065.75033.0000 3.081 2.961 41 2 4.500 4.350 5.196 4.95922.060 1.815 0.19 0.066.25031 4 3.2500 3.335 3.210 47 8 4.875 4.712 5.629 5.372 23 16 2.251 1.936 0.19 0.066.75031 2 3.5000 3.589 3.461 51 4 5.250 5.075 6.062 5.786 25 16 2.380 2.057 0.19 0.067.25033 4 3.7500 3.858 3.726 55 8 5.625 5.437 6.495 6.198 21 2 2.572 2.241 0.19 0.067.75044.0000 4.111 3.97566.000 5.800 6.928 6.612 211 16 2.764 2.424 0.19 0.068.250* Thread lengths, LT, shown are for bolt lengths 6 inches and shorter. For longer bolt lengths add 0.250 inch tothread lengths shown.Dimensions of Heavy Hex Bolts (All dimensions are in inches)Nominal SizeFull Size Width Across Flats,WidthHead Height, HRadius of Threador BasicBodyAcrossFillet, RLength,*FProductDiameter, ECorners, GLTDiameterMax. Min. Basic Max. Min. Max. Min. Basic Max. Min. Max. Min.Nom.3 1 0.3750 0.388 0.360 11 16 0.688 0.669 0.794 0.7630.268 0.226 0.03 0.011.000841 7 0.5000 0.515 0.4820.875 0.850 1.010 0.969 11 32 0.364 0.302 0.03 0.011.250285 0.6250 0.642 0.605 11 16 1.062 1.031 1.227 1.175 27 64 0.444 0.378 0.06 0.021.50083 1 0.7500 0.768 0.729 11 4 1.250 1.212 1.443 1.3830.524 0.455 0.06 0.021.750427 0.8750 0.895 0.852 17 16 1.438 1.394 1.660 1.589 37 64 0.604 0.531 0.06 0.022.000811.0000 1.022 0.976 15 8 1.625 1.575 1.876 1.796 43 64 0.700 0.591 0.09 0.032.2503 11 8 1.1250 1.149 1.098 113 16 1.812 1.756 2.093 2.0020.780 0.658 0.09 0.032.500411 4 1.2500 1.277 1.22322.000 1.938 2.309 2.209 27 32 0.876 0.749 0.09 0.032.75013 8 1.3750 1.404 1.345 23 16 2.188 2.119 2.526 2.416 29 32 0.940 0.810 0.09 0.033.00011 2 1.5000 1.531 1.470 23 8 23.75 2.300 2.742 2.62211.036 0.902 0.09 0.033.25015 1.6250 1.658 1.591 29 16 2.562 2.481 2.959 2.829 13 32 1.116 0.978 0.09 0.033.500813 4 1.7500 1.785 1.716 23 4 2.750 2.662 3.175 3.035 15 32 1.196 1.054 0.12 0.043.75017 8 1.8750 1.912 1.839 215 16 2.938 2.844 3.392 3.242 11 4 1.276 1.130 0.12 0.044.00022.0000 2.039 1.964 31 8 3.125 3.025 3.608 3.449 111 32 1.388 1.175 0.12 0.044.25021 4 2.2500 2.305 2.214 31 2 3.500 3.388 4.041 3.862 11 2 1.548 1.327 0.19 0.064.75021 2 2.5000 2.559 2.461 37 8 3.875 3.750 4.474 4.275 121 32 1.708 1.479 0.19 0.065.25023 4 2.7500 2.827 2.711 41 4 4.250 4.112 4.907 4.688 113 16 1.869 1.632 0.19 0.065.75033.0000 3.081 2.961 45 8 4.625 4.475 5.340 5.10222.060 1.815 0.19 0.066.250* Thread lengths, LT, shown are for bolt lengths 6 inches and shorter. For longer bolt lengths add 0.250 inch tothread lengths shown.Thread LengthNominal thread length equals twice the basic thread diameter 0.25 in. for nominal boltlengths up to and including 6 in. and twice the basic thread diameter 0.50 in. for nominal6Product (Dimensions and Tolerances) Standards for Threaded Fastenerswww.practicalmaintenance.net
lengths over 6 in. The nominal thread length, LT, a reference dimension is used to calculatethread length.The length of thread on bolts is controlled by the grip gaging length. The maximum gripgaging length, LG, as calculated and rounded to two decimal places for any bolt not threadedfull length, shall be equal to the nominal bolt length minus the nominal thread length (LG,max. L, nom. LT) with a tolerance of minus a length equal to five coarse thread pitches.For bolts that are threaded full length, LG, max. defines the unthreaded length under thehead and shall not exceed the length of 2.5 times the thread pitch for sizes up to andincluding 1 in. and 3.5 times the thread pitch for sizes larger than 1 in.All bolts of nominal lengths equal to or shorter than the nominal thread length, LT, plus alength equivalent to 2.5 times the thread pitch for sizes up to and including 1 in. and 3.5times the thread pitch for sizes larger than 1 in. shall be threaded for full length.ScrewsWasher FaceThickness of the washer face shall be not less than 0.015 in. or greater than 0.025 in. forscrew sizes 3 4 in. and smaller and not less than 0.015 in. nor greater than 0.035 in. for sizeslarger than 3 4 in. The washer face diameter shall be equal to the maximum width across flatswith a tolerance of 10%. The washer face is not applicable to hex flange or lobe headscrews.FilletFor styles of head-to-shank fillets and maximum-minimum limits for R, please see thestandard.Thread LengthThe length of thread on screws is controlled by the grip gaging length, LG, max., and bodylength, LB, min. For more information on length of thread, please see the standard.Following tables show dimensions of hex cap screws and heavy hex screws.7Product (Dimensions and Tolerances) Standards for Threaded Fastenerswww.practicalmaintenance.net
Nominal Sizeor BasicProductDiameter1 0.250045 0.3125163 0.375087 0.4375161 0.500029 0.5625165 0.625083 0.750047 0.8750811.000011 8 1.125011 4 1.250013 8 1.375011 2 1.500015 8 1.625013 4 1.750017 8 1.875022.000021 4 2.250021 2 2.500023 4 2.750033.0000Dimensions of Hex Cap Screws (All dimensions are in inches)BodyWidth Across Flats,WidthHead Height, HMinimum ThreadDiameter, EAcrossWrenching Length,*FCorners, GHeight, JLTMax. Min. Basic Max. Min. Nom. Min. Basic Max. Min.Nom.0.2500 0.2450 7 16 0.438 0.428 0.505 0.488 5 32 0.163 0.1500.1060.7500.3125 0.3065 1 20.500 0.489 0.577 0.557 13 64 0.211 0.1950.1400.8750.3750 0.3690 9 16 0.562 0.551 0.650 0.628 15 64 0.243 0.2260.1601.0000.4375 0.4305 5 80.625 0.612 0.722 0.698 9 32 0.291 0.2720.1951.1250.5000 0.4930 3 40.750 0.736 0.866 0.840 5 16 0.323 0.3020.2151.2500.5625 0.5545 13 16 0.812 0.798 0.938 0.910 23 64 0.371 0.3480.2501.3750.6250 0.6170 15 16 0.938 0.922 1.083 1.051 25 64 0.403 0.3780.2691.5000.7500 0.7410 11 8 1.125 1.100 1.299 1.254 15 32 0.483 0.4550.3241.7500.8750 0.8660 15 16 1.312 1.285 1.516 1.465 35 64 0.563 0.5310.3782.0001.0000 0.9900 11 2 1.500 1.469 1.732 1.675 39 64 0.627 0.5910.4162.2501.1250 1.1140 111 16 1.688 1.631 1.949 1.859 11 16 0.718 0.6580.4612.5001.2500 1.2390 17 8 1.875 1.812 2.165 2.066 25 32 0.813 0.7490.5302.7501.3750 1.3630 21 16 2.062 1.994 2.382 2.273 27 32 0.878 0.8100.5693.0001.5000 1.4880 21 4 2.250 2.175 2.598 2.480 15 16 0.974 0.9020.6403.2501.6250 1.6130 27 16 2.438 2.356 2.815 2.68611.038 0.9620.6943.5001.7500 1.7380 25 8 2.625 2.538 3.031 2.893 13 32 1.134 1.0540.7483.7501.8750 1.8630 213 16 2.812 2.719 3.248 3.099 15 32 1.198 1.1140.8024.0002.0000 1.988033.000 2.900 3.464 3.306 17 32 1.263 1.1750.8254.2502.2500 2.2380 33 8 3.375 3.262 3.897 3.719 13 8 1.423 1.3270.9335.000#2.5000 2.4880 33 4 3.750 3.625 4.330 4.133 117 32 1.583 1.4791.0425.500#2.7500 2.7380 41 8 4.125 3.988 4.763 4.546 111 16 1.744 1.6321.1516.000#3.0000 2.9880 41 2 4.500 4.350 5.196 4.959 17 8 1.935 1.8151.2906.500#Nominal Sizeor BasicProductDiameter3 8 0.37501 0.500025 0.625083 0.750047 0.8750811.000011 8 1.125011 4 1.250013 8 1.375011 2 1.500015 8 1.625013 4 1.750017 8 1.875022.000021 4 2.250021 2 2.500023 4 2.750033.000031 4 3.250031 2 3.500033 4 3.750044.000041 4 4.250041 2 4.500043 4 4.750055.000051 4 5.250051 2 5.500053 4 5.750066.0000Dimensions of Heavy Hex Screws (All dimensions are in inches)BodyWidth Across Flats,WidthHead Height, HMinimumDiameter, EAcrossWrenchingFCorners, GHeight, JMax. Min. Basic Max. Min. Nom. Min. Basic Max. Min.0.3750 0.360 11 16 0.688 0.669 0.794 0.763 15 64 0.243 0.2260.1607 0.5000 0.4820.875 .0850 1.010 0.969 5 16 0.323 0.3020.21580.6250 0.605 11 16 1.062 1.031 1.227 1.175 25 64 0.403 0.3780.2690.7500 0.729 11 4 1.250 1.212 1.443 1.383 15 32 0.483 0.4550.3240.8750 0.852 17 16 1.438 1.394 1.660 1.589 35 64 0.563 0.5310.3781.0000 0.976 15 8 1.625 1.575 1.876 1.796 39 64 0.627 0.5910.4161.1250 1.098 113 16 1.812 1.756 2.093 2.002 11 16 0.718 0.6580.4611.2500 1.22322.000 1.938 2.309 2.209 25 32 0.813 0.7490.5301.3750 1.345 23 16 2.188 2.119 2.526 2.416 27 32 0.878 0.8100.5691.5000 1.470 23 8 2.375 2.300 2.742 2.622 15 16 0.974 0.9020.6401.6250 1.591 29 16 2.562 2.481 2.959 2.82911.038 0.9620.6941.7500 1.716 23 4 2.750 2.662 3.175 3.035 13 32 1.134 1.0540.7481.8750 1.839 215 16 2.938 2.844 .392 3.242 15 32 1.198 1.1140.8022.0000 1.964 31 8 3.125 3.025 3.608 3.449 17 32 1.263 1.1750.8252.2500 2.214 31 2 3.500 3.388 4.041 3.862 13 8 1.423 1.3270.9332.5000 2.461 37 8 3.8750 3.750 4.474 4.275 117 32 1.583 1.4791.0422.7500 2.711 41 4 4.2500 41.112 4.907 4.688 111 16 1.744 1.6321.1513.0000 2.961 45 8 4.6250 4.475 5.340 5.102 17 8 1.935 1.8151.2903.2500 3.210055.0000 4.838 5.774 5.51522.126 1.9981.3993.5000 3.4610 53 8 5.3750 5.200 6.207 5.928 21 4 2.256 2.1201.4843.7500 3.7109 53 4 5.7500 5.562 6.640 6.341 23 8 2.447 2.3031.6124.0000 3.9609 61 8 6.1250 5.925 7.073 6.755 21 2 2.576 2.4241.6974.2500 4.2228 61 2 6.5000 6.288 7.506 7.168 23 4 2.768 2.6081.8264.5000 4.4727 67 8 6.8750 6.650 7.939 7.581 27 8 2.896 2.7281.9104.7500 4.7227 71 4 7.2500 7.012 8.372 7.99433.088 2.9122.0385.0000 4.9726 75 8 7.6250 7.375 8.805 8.408 31 8 3.217 3.0332.1235.2500 5.222688.0000 7.738 9.238 8.821 33 8 3.408 3.2162.2515.5000 5.4726 83 8 8.3750 8.100 9.671 9.234 31 2 3.538 3.3382.3375.7500 5.7225 83 4 8.7500 8.462 10.104 9.647 35 8 3.729 3.5212.4656.0000 5.9725 91 8 9.1250 8.825 10.537 10.060 33 4 3.858 3.6422.5498Product (Dimensions and Tolerances) Standards for Threaded 11.000#11.500#12.000#12.500#
* Thread lengths, LT, shown are for bolt lengths 6 inches and shorter. For longer bolt lengths add 0.250 inch tothread lengths shown.# Thread lengths, LT, shown are for bolt lengths over 6 inches.Wrenching Height, J is a distance measured from the bearing surface up the side of thehead at the corners.Hex Flange ScrewsHex flange screws (bolts) are regular hex head bolts with built-in washer. The stress underthe face of a standard hexagon headed nut can result in indentation into standard strengthsteel surfaces. Washers have traditionally been used to protect the joint surface fromdamage during the tightening process and to distribute the load under the bolt head and nut.Standard washers are typically softer than the nuts and bolts that they are used with and canoften plastically deform under the high compressive stress that they must sustain. Flangeheaded nuts and bolts do not suffer from this effect since the washer face is as strong as thebolt/nut itself. Washers are also used with irregular and oversized holes.In recent years, washers have started to be replaced by flange headed bolts. Flange headedbolts have been developed to eliminate the deficiencies that have been found with the use ofwashers. Hexagon flange bolts are commonly used in automotive industry.Following table shows dimensions of hex flange screws.Dimensions of Hex Flange Screws (All dimensions are in inches)Nominal Body Diam., Width Across Flats,WidthMaximum Minimum Maximum Minimum Minimum ThreadSizeAcrossFlangeFlangeHeadHexBearing Length*,EFCorners, G Diam., B Thickness, Height, H Height, Diam., B1LT ,Nom.KH1Max. Min. Basic Max. Min. Max. Min.1 40.2500 0.2450 3 8 0.3750 0.367 0.433 0.4090.560.040.280.170.4800.7505 160.3125 0.3065 1 2 0.5000 0.489 0.577 0.5480.680.050.320.210.6000.8753 80.3750 0.3690 9 16 0.5625 0.551 0.650 0.6180.810.060.390.250.7301.0007 160.4375 0.4305 5 8 0.6250 0.612 0.722 0.6850.930.070.460.300.8501.1251 20.5000 0.4930 3 4 0.7500 0.736 0.866 0.8251.070.080.510.340.9801.2509 160.5625 0.5545 13 16 0.8125 0.798 0.938 0.8951.190.090.570.381.1001.3755 80.6250 0.6170 15 16 0.9375 0.922 1.083 1.0341.330.100.620.421.2301.5003 40.7500 0.7410 11 8 1.1250 1.100 1.299 1.2341.590.110.730.511.4701.750* Thread lengths, LT, shown are for bolt lengths 6 inches and shorter. For longer bolt lengths add 0.250 inch to thread lengthsshown.For hex cap and heavy hex cap screws, top of head shall be full form and chamfered, withthe diameter of chamfer circle being equal to the maximum width across flats within atolerance of 15%. For hex flange and lobe head screws, top of head may be full form orindented at the option of the manufacturer. If full form, the top of head shall be chamfered orrounded with the diameter of chamfer circle or start of rounding being equal to the maximumwidth across flats, within a tolerance of 15%. If the top of head is indented, the peripherymay be rounded.9Product (Dimensions and Tolerances) Standards for Threaded Fastenerswww.practicalmaintenance.net
For information on other products (square head bolts, askew head bolts, lobe head screws;and lag screws) please see the standard.ASME B18.2.2ASME B18.2.2 cover the complete general and dimensional data for the various types ofinch series square and hex nuts, including machine screw nuts and coupling nuts,recognized as American National Standard.General DataWidth Across FlatsThe width across flats of a nut is the distance measured, perpendicular to the axis of nut,overall between two opposite sides of the nut.Nut ThicknessThe nut thickness is the overall distance, measured parallel to the axis of a nut, from the topof the nut to the bearing surface and shall include the thickness of the washer face whereprovided.Washer Face DiameterUnless otherwise specified, the diameter of washer face shall be within the limits of themaximum width across flats and 95% of the minimum width across flats.ThreadsThreads shall be Unified Standard, Class 2B, of the series specified in the notes onrespective dimensional tables, in accordance with ASME B1.1. Class 3B may be specifiedby the purchaser if designated at the time of inquiry and order.DesignationNuts shall be designated in the sequence by: product name; dimensional standard, nominalsize (fraction or decimal); threads per inch; mechanical and performance standard, andgrade protective finish (including specification and thickness), if required.For Example: Hex Nut, ASME B18.2.2, 3 4-16, SAE J995 Grade 5, Steel.Dimensions of Hex Nuts and Hex Jam Nuts10Product (Dimensions and Tolerances) Standards for Threaded Fastenerswww.practicalmaintenance.net
Following table shows dimensions of hex nuts and hex jam nuts.Dimensions of Hex Nuts and Hex Jam Nuts (All dimensions are in inches)Nominal Basic MajorWidth AcrossWidth AcrossThickness HexThickness JamSizeDiameter ofFlats, FCorners, GNuts, HNuts, H1ThreadMin.Max.Min.Max.Min.Max.Min.Max.1 0.25000.4280.4380.4880.5050.2120.2260.1500.16345 0.31250.4890.5000.5570.5770.2580.2730.1800.195163 0.37500.5510.5630.6280.6500.3200.3370.2100.22787 0.43750.6750.6880.7680.7940.3650.3850.2400.260161 0.50000.7360.7500.8400.8660.4270.4480.3020.32329 0.56250.8610.8750.9821.0100.4730.4960.3010.324165 0.62500.9220.9381.0511.0830.5350.5590.3630.38783 0.75001.0881.1251.2401.2990.6170.6650.3980.44647 00001.4501.5001.6531.7320.8310.8870.5190.57511 81.12501.6311.6881.8591.9490.9390.9990.5790.63911 41.25001.8121.8752.0662.1651.0301.0940.6870.75113 81.37501.9942.0622.2732.3821.1381.2060.7470.81511 21.50002.1752.2502.4802.5981.2451.3170.8080.88015 81.62502.352.432.6792.8051.3641.4160.8680.94413 41.75002.5382.6252.8933.0311.4601.5400.9291.00917 00002.9003.0003.3063.4641.6751.7631.0501.13821 42.25003.2633.3753.7193.8971.8901.9861.1551.26721 22.50003.6253.7504.1334.3302.1052.2091.4011.42723 00004.3504.5004.9595.1962.5342.6541.6431.68531 43.25004.7134.8755.3735.6292.7492.8771.7481.81431 23.50005.0755.2505.7866.0622.9643.1001.8701.94333 ions of Hex Thick NutsFollowing table shows dimensions of hex thick nuts11Product (Dimensions and Tolerances) Standards for Threaded Fastenerswww.practicalmaintenance.net
NominalSize1 45 163 87 161 29 165 83 47 8111 811 413 811 2Dimensions of Hex Thick Nuts (All dimensions are in inches)Basic MajorWidth Across Flats, FWidth AcrossThickness Hex Nuts, HDiameter ofCorners, GThreadBasicMin.Max.Min.Max.BasicMin.Max.7 9 0.25000.4280.4380.4880.5050.2740.28816321 21 0.31250.4890.5000.5570.5770.3200.336264913 0.3750 160.5510.5620.6280.6500.3980.4153211 29 0.43750.6750.6880.7680.7940.4440.46316643 9 0.50000.7360.7500.8400.8660.5520.5734167 39 0.56250.8610.8750.8921.0100.5980.62186415 23 0.62500.9220.9381.0511.0830.7060.731163213 0.750011 81.0881.1251.2401.2990.7980.8271629 0.875015 161.2691.3121.4471.5160.8900.922321.000011 21.4501.5001.6531.73210.9821.0181.1250111 161.6311.6881.8591.94915 321.1361.1761.250017 81.8121.8752.0662.16511 41.2281.2721.375021 161.9942.0622.2732.38213 81.3511.3991.500021 42.1752.2502.4802.59811 21.4741.526Dimensions of Heavy Hex Nuts and Heavy Hex Jam NutsFollowing table shows dimensions of heavy hex nuts and heavy hex jam nutsDimensions of Heavy Hex Nuts and Heavy Hex Jam Nuts (All dimensions are in inches)Nominal Basic Major Width Across Flats, F Width Across Thickness Heavy Hex Thickness HeavySizeDiameter ofCorners, GNuts, HHex Jam Nuts, H1ThreadBasic Min.Max.Min.Max. Basic Min. Max. Basic Min. Max.1 1 15 0.25000.488 0.500 0.556 0.5770.218 0.250 11 64 0.156 0.18842645 9190.3125 160.546 0.562 0.622 0.650 64 0.280 0.314 13 64 0.186 0.220163 11 23 0.37500.669 0.688 0.763 0.7940.341 0.377 15 64 0.216 0.252816647 3 27 0.43750.728 0.750 0.830 0.8660.403 0.441 17 64 0.247 0.285164641 7310.5000 80.850 0.875 0.969 1.010 64 0.464 0.504 19 64 0.277 0.31729 15 35 0.56250.9090.9381.0371.0830.526 0.568 21 64 0.307 0.3491616645 39 0.625011 16 1.031 1.062 1.175 1.2270.587 0.631 23 64 0.337 0.3818643 1470.75001 41.212 1.250 1.382 1.443 64 0.710 0.758 27 64 0.398 0.44647 7550.87501 161.394 1.438 1.589 1.660 64 0.833 0.885 31 64 0.458 0.510863 11.00001 5 81.575 1.625 1.796 1.8760.956 1.012 35 64 0.519 0.575641 1 81.1250113 16 1.756 1.812 2.002 2.09317 64 1.079 1.139 39 64 0.579 0.6391 1 41.250021.938 2.000 2.209 2.30917 32 1.187 1.251 23 32 0.687 0.7511 3 81.375023 162.119 2.188 2.416 2.526 111 32 1.310 1.378 25 32 0.747 0.8151 1 21.50002 3 82.300 2.375 2.622 2.742 115 32 1.433 1.505 27 32 0.808 0.880591 81.62502 162.481 2.562 2.828 2.959 119 32 1.556 1.632 29 32 0.868 0.944331 41.75002 42.662 2.750 3.035 3.175 123 32 1.679 1.759 31 32 0.929 1.0091 7 81.8750215 16 2.844 2.938 3.242 3.392 127 32 1.802 1.886 11 32 0.989 1.07322.00003 1 83.025 3.125 3.449 3.608 131 32 1.925 2.013 13 32 1.050 1.138112 42.25003 23.388 3.500 3.862 4.041 213 64 2.155 2.251 113 64 1.155 1.2512 1 22.50003 7 83.750 3.875 4.275 4.474 229 64 2.401 2.505 129 64 1.401 1.5052 3 42.75004 1 44.112 4.250 4.688 4.907 245 64 2.647 2.759 137 64 1.522 1.63412Product (Dimensions and Tolerances) Standards for Threaded Fastenerswww.practicalmaintenance.net
33 1 43 1 23 3 443.00003.25003.50003.75004.00004 5 855 3 85 3 46 1 3261 6433 1637 16311 16315 14145 64113 16115 1621 1623 64Dimensions of Hex Flange Nuts and Large Hex Flange NutsFollowing table shows dimensions of hex flange nuts and large hex flange nutsDimensions of Hex Flange Nuts and Large Hex Flange Nuts (All dimensions are in inches)Nominal Basic MajorSizeDiameter ofThreadWidth AcrossFlats, FMin.Max.No. 6810121 45 163 87 161 29 165 83 .50
ASME B18.2.1 covers the dimensional requirements for inch series square head, hex, heavy hex, and askew head bolts; hex (hex cap), heavy hex, hex flange, and lobe head screws; and lag screws recognized as American National Standard. Terminology In this standard, “short bolt” or “short screw” me
RMA EXTRUSION TOLERANCES TABLE PAGE Table 13 – Standard Cross-Sectional Tolerances 2 Table 16 – Cut Length Tolerances for Unspliced Extrusions 3 Table 18 – Spliced Length Tolerances 4 Table 33 – Cross-Sectional Tolerances for Extruded Closed Cell Silicone 5 Table 36 – Irregular
NOTE: The nominal tolerances are design tolerances. Once a part has been developed, the running tolerances can usually be tighter than the design tolerances. Running tolerances normally must be the actual measurements obtained for development samples. 0" L 0" FIG. 4: SUM OF SEVERAL SEGMENT LENGTHS 1" C 1" L 1" 1" L L C
2.2 Standards on dimensions and tolerances (see 7.7.1) EN 10017, Non-alloy steel rod for drawing and/or cold rolling – Dimensions andtolerances. EN 10024, Hot rolled taper flange I sections - Tolerances on shape and dimensions. EN 10029, Hot rolled steel plates 3 mm thick or above - Tolerances on dimensions, shape and mass. EN 10034
EN 10034, Structural steel I and H sections - Tolerances on shape and dimensions. EN 10048, Hof ro/led nar/ ow steel strip - Tolerances on dimensions and shape. EN 10051, Continuously hot-rolled uncoated plate, sheet and strip of non-alloy and alloy steels - Tolerances on dimensions and shape EN 10055, Hot-rolled steel equal flange tees with .
EN 10029, Hot rolled steel plates 3 mm thick or above - Tolerances on dimensions, shape and mass. EN 10034, Structural steel I and H sections - Tolerances on shape and dimensions. EN 10048, Hot rolled narrow steel strip - Tolerances on dimensions and shape. EN 10051, Continuously hot-rolled uncoated plate, sheet and strip of non-alloy and alloy .
ISO 8015'. Where that is the case. the general geometrical tolerances (i.e. the tolerances of form and position) apply independently of the actual local sizes of the workpiece feature. Each individual tolerance requirement must be met. The general geometrical tolerances may thus also be applied even if the features are everywhere at their
ASME B16.11 Tees Dimensions ASME B16.11 Reducers Dimensions ASME B16.11 Bushing Dimensions ASME B16.11 Caps Dimensions ASME B16.11 Crosses Dimensions ASME B16.11 Couplings Dimensions ASME B16.11 Plugs Dimensions ASME B16.11/BS 3799 Pipe Nipples Dimensions BS 3799 Unions Dimensions ASME B16.11/BS 3799 Swag
Products, LLC P.O. Box 1431, Sherwood, Oregon, USA 97140. Toll Free: 1-800-864-1272 Fax: 503-625-3748. 2. Panel tolerances for racquetball court panels shall comply with tolerances as published by United States Racquetball Association ( USRA). 3. Panel tolerances for squash court panels shall comply with tolerances as published by the World
