1.6-300 mmISO thread dim 1,6mm to 300mm diaNotes:The dimensions identified are for medium tolerance grade 6H/6g for the screw threads. This grade is implied if it is not designated with the screw size e.g M20 x 2** BS 3643 and ISO 965 simply indicate that the contour of the major dia of the female thread should no transgress the basic contour.External (bolt thread)- 6g ClassInternal (nut thread)- 6H ClassSize mmPitch mmMajor DiaPitch DiaMinor DiaMinor DiaPitch DiaMajor DiaTap Drilld=D-mmd2=D2 -mm.d3 -mmD1 -mmd2=D2 -mm.d=D-mmmaxminmaxminmaxminminmaxminmaxminNote **1,60,35-1,5811,4961,3541,2911,2021,075-1,2211,3211,3731,4581,600-1,2501,60,3-1,5821,5071,3871,3421,2571,157-1,2751,3601,4051,4651,600-1,3001,60,2-1,5831,5271,4531,4031,3661,280-1,3831,4581,4701,5371,600-1,4001,70,35-1,6811,5961,4541,3911,3021,175-1,3211,4211,4731,5581,700-1,3501,80,35-1,7811,6961,5541,4911,4021,275-1,4211,5211,5731,6581,800-1,4501,80,2-1,7831,7271,6531,6031,5661,480-1,5831,6581,6701,7371,800-1,60020,4-1,9811,8861,7211,6541,5481,408-1,5671,6791,7401,8302,000-1,60020,25-1,9821,9151,8201,7641,7111,610-1,7291,8091,8381,9132,000-1,7502,20,45-2,1802,0801,8881,8171,6931,540-1,7131,8381,9082,0032,200-1,7502,20,25-2,1822,1152,0201,9641,9111,810-1,9292,0092,0382,1132,200-1,9502,30,45-2,2802,1801,9881,9171,7931,640-1,8131,9382,0082,1032,300-1,8502,30,4-2,2812,1862,0211,9541,8481,708-1,8671,9792,0402,1302,300-1,9002,50,45-2,4802,3802,1882,1171,9931,840-2,0132,1382,2082,3032,500-2,0502,50,35-2,4812,3962,2542,1912,1021,975-2,1212,2212,2732,3582,500-2,1502,60,45-2,5802,4802,2882,2172,0931,940-2,1132,2382,3082,3932,600-2,15030,5-2,9802,8742,6552,5802,4392,272-2,4592,5992,6752,7753,000-2,50030,35-2,9812,8962,7542,6872,6022,471-2,6212,7212,7732,8633,000-2,6503,50,6-3,4793,3543,0893,0042,8292,635-2,8503,0103,1103,2223,500-2,9003,50,35-3,4813,3963,2543,1873,1022,971-3,1213,2213,2733,3633,500-3,15040,7-3,9783,8383,5233,4333,2203,002-3,2423,4223,5453,6634,000-3,30040,5-3,9803,8743,6553,5803,4393,272-3,4593,5993,6753,7754,000-3,3004,50,75-4,4784,3383,9913,9013,6663,439-3,6883,8784,0134,1314,500-3,7504,50,5-4,4804,3744,1554,0803,9393,772-3,9594,0994,1754,2754,500-4,00050,8-4,9764,8264,4564,3614,1103,869-4,1344,3344,4804,6055,000-4,20050,5-4,9804,8744,6554,5804,4394,272-4,4594,5994,6754,7755,000-4,5005,50,5-5,4805,3745,1555,0654,9394,757-4,9595,0995,1755,2955,500-5,00061-5,9745,7945,3245,2124,8914,596-4,9175,1535,3505,5006,000-5,00060,8-5,9765,8265,4565,3765,1104,884-5,1345,3345,4805,5866,000-4,20060,75-5,9785,8385,4915,3915,1664,929-5,1885,3785,5135,6456,000-5,00060,7-5,9785,8385,5235,4285,2204,997-5,2425,4225,5455,6716,000-5,30060,5-5,9805,8745,6555,5705,4395,262-5,4595,5995,6755,7876,000-5,50071-6,9746,7946,3246,2125,8915,596-5,9176,1536,3506,5007,000-6,00070,75-6,9786,8386,4916,3916,1665,929-6,1886,3786,5136,6457,000-6,25070,5-6,9806,8746,6556,5706,4396,262-6,4596,5996,6756,7877,000-6,50081,25-7,9727,7607,1607,0426,6196,272-6,6476,9127,1887,3488,000-6,75081-7,9747,7947,3247,2126,8916,596-6,9177,1537,3507,5008,000-7,00080,8-7,9767,8267,4567,3507,1106,858-7,1347,3347,4807,6208,000-7,20080,75-7,9787,8387,4917,3917,1666,929-7,1887,3787,5137,6458,000-7,25080,5-7,9807,8747,6557,5707,4397,262-7,4597,5997,6757,7878,000-7,50091,25-8,9728,7608,1608,0427,6197,272-7,6477,9128,1888,3489,000-7,75091-8,9748,7948,3248,2127,8917,596-7,9178,1538,3508,4989,000-8,00090,75-8,9788,8388,4918,3918,1667,929-8,1888,3788,5138,6459,000-8,25090,5-8,9808,8748,6558,5708,4398,262-8,4598,5998,6758,7879,000-8,500101,5-9,9689,7328,9948,8628,3447,938-8,3768,6769,026-10,000-8,500101,25-9,9729,7609,1609,0428,6198,272-8,6478,9129,1889,34810,000-8,750101-9,9749,7949,3249,2128,8918,596-8,9179,1539,3509,50010,000-9,000100,75-9,9789,8389,4919,3919,1668,929-9,1889,3789,5139,64510,000-9,250100,5-9,9809,8749,6559,5709,4399,262-9,4599,5999,6759,78710,000-9,500111,5-10,96810,7329,9949,8629,3448,938-9,3769,67610,02610,19611,000-9,500111-10,97410,79410,32410,2129,8919,596-9,91710,15310,35010,50011,000-10,000110,75-10,97810,83810,49110,39110,1669,929-10,18810,37810,51310,64511,000-10,250110,5-10,98010,87410,65510,57010,43910,262-10,45910,59910,67510,78711,000-10,500121,75-11,96611,70110,82910,67910,0729,601-10,10610,44110,86311,06312,000-10,250121,5-11,96811,73210,99410,85410,3449,930-10,37610,67611,02611,21612,000-10,500121,25-11,97211,76011,16011,02810,61910,258-10,64710,91211,18811,36812,000-10,750121-11,97411,79411,32411,20610,89110,590-10,91711,15311,35011,51012,000-11,000120,75-11,97811,83811,49111,38511,16610,923-11,18811,37811,51311,65312,000-11,250120,5-11,98011,87411,65511,56511,43911,257-11,45911,59911,67511,79512,000-11,500142-13,96213,68212,66312,50311,79711,271-11,83512,21012,70112,91314,000-12,000141,5-13,96813,73212,99412,85412,34411,930-12,37612,67613,02613,21614,000-12,500141,25-13,97213,76013,16013,02812,61912,258-12,64712,91213,18813,35814,000-12,750141-13,97413,79413,32413,20612,89112,590-12,91713,15313,35013,51014,000-13,000140,75-13,97813,83813,49113,38513,16612,923-13,18813,37813,51313,65314,000-13,250140,5-13,98013,87413,65513,56513,43913,257-13,45913,59913,67513,79514,000-13,500151,5-14,96814,73213,99413,85413,34412,930-13,37613,67614,02614,21615,000-13,500151-14,97414.79414,32414,20613,89113,590-13,91714,15314,35014,51015,000-14,000162-15.96215.68214.66314.50313.79713.271-13.83514.2114.70114.91316-14161.6-15.96815.75614.92914.82414.23613.838-14.26814.56814.96115.10116-14.4161.5-15.96815.73214.99414.85414.34413.93-14.37614.67615.02615.21616-14.5161.25-15.97215.7615.1615.02814.61914.258-14.64714.91215.18815.35816-14.75161-15.97415.79415.32415.20614.89114.59-14.91715.15315.3515.5116-15160.75-15.97815.83815.49115.38515.16614.923-15.18815.37815.51315.65316-15.25160.5-15.9815.87415.65515.56515.43915.257-15.45915.59915.67515.79516-15.5171,5-16,96816,73215,99415,85415,34414,930-15,37615,67616,02616,21617,000=15,500171-16,97416,79416,32416,20615,89115,590-15,91716,15316,35016,51017,000-16,000182,5-17,95817,62316,33416,16415,25214,624-15,29415,74416,37616,60118,000-15,500182-17,96217,68216,66316,50315,79715,271-15,83516,21016,70116,91318,000-16,000181,5-17,96817,73216,99416,85416,34415,930-16,37616,67617,02617,21618,000-16,500181,25-17,97217,76017,16017,02816,61916,258-16,64716,91217,18817,35818,000-16,750181-17,97417,79417,32417,20616,89116,590-16,91717,15317,35017,51018,000-17,000180,75-17,97817,83817,49117,38517,16616,923-17,18817,37817,51317,65318,000-17,250180,5-17,98017,87417,65517,56517,43917,257-17,45917,59917,67517,79518,000-17,500202,5-19,95819,62318,33418,16417,25216,624-17,29417,74418,37618,60020,000-17,500202-19,96219,68218,66318,50317,79717,271-17,83518,21018,70118,91320,000-18,000201,5-19,96819,73218,99418,85418,34417,930-18,37618,67619,02619,21620,000-18,500201-19,97419,79419,32419,20618,89118,590-18,91719,15319,35019,51020,000-19,000200,75-19,97819,83819,49119,38519,16618,923-19,18819,37819,51319,65320,000-19,250200,5-19,98019,87419,65519,56519,43919,257-19,45919,59919,67519,79520,000-19,500223-21,95221,57720,00319,81818,70417,970-18,75219,25220,05120,29622,000-19,000222,5-21,95821,62320,33420,16419,25218,624-19,29419,74420,37620,60022,000-19,500222-21,96221,68220,66320,50319,79719,271-19,83520,21020,70120,91322,000-20,000221,5-21,96821,73220,99420,85420,34419,930-20,37620,67621,02621,21622,000-20,500221-21,97421,79421,32421,20620,89120,590-20,91721,15321,35021,51022,000-21,000220,75-21,97821,83821,49121,38521,16620,923-21,18821,37821,51321,65322,000-21,250220,5-21,98021,87421,65521,56521,43921,257-21,45921,59921,67521,79522,000=21,500243-23,95223,57722,00321,80320,70419,955-20,75221,25222,05122,31624,000-21,000242,5-23,95823,62322,33422,14421,25220,604-21,29421,74422,37622,62624,000-21,500242-23,96223,68222,66322,49321,79721,261-21,83522,21022,70122,92524,000-22,000241,5-23,96823,73222,99422,84422,34421,920-22,37622,67623,02623,22624,000-22,500241-23,97423,79423,32423,19922,89122,583-22,91723,15323,35023,52024,000-23,000240,75-23,97823,83823,49123,37923,16622,917-23,18823,37823,51323,66324,000-23,250252-24,96224,68223,66323,49322,79722,261-22,83523,21023,70123,92525,000-23,000251,5-24,96824,73223,99423,84423,34422,920-23,37623,67624,02624,22625,000-23,500251-24,97424,79424,32424,19923,89123,583-23,91724,15324,35024,52025,000-24,000261,5-25,96825,73224,99424,84424,34423,920-24,37624,67625,02625,22626,000-24,500273-26,95226,57725,00324,80323,70422,955-23,75224,25225,05125,31627,000-24,000272-26,96226,68225,66325,49324,79724,261-24,83525,21025,70125,92527,000-25,000271,5-26,96826,73225,99425,84425,34424,920-25,37625,67626,02626,22627,000-25,500271-26,97426,79426,32426,19925,89125,583-25,91726,15326,35026,52027,000-26,000270,75-26,97826,83826,49126,37926,16625,917-26,18826,37826,51326,66327,000-26,250282-27,96227,68226,66326,49325,79725,261-25,83526,21026,70126,92528,000-26,000281,5-27,96827,73226,99426,84426,34425,920-26,37626,67627,02627,22628,000-26,500281-27,97427,79427,32427,19926,89126,583-26,91727,15327,35027,52028,000-27,000303,5-29,94729,52227,67427,46226,15825,306-26,21126,77127,72728,00730,000-26,500303-29,95229,57728,00327,80326,70425,955-26,75227,25228,05128,31630,000-27,000302,5-29,95829,62328,33428,14427,25226,604-27,29427,74428,37628,62630,000-27,500302-29,96229,68228,66328,49327,79727,261-27,83528,21028,70128,92530,000-28,000301,5-29,96829,73228,99428,84428,34427,920-28,37628,67629,02629,22630,000-28,500301-29,97429,79429,32429,19928,89128,583-28,91729,15329,35029,52030,000-29,000300,75-29,97829,83829,49129,37929,16628,917-29,18829,37829,51329,66330,000-29,250322-31,96231,68230,66330,49329,79729,261-29,83530,21030,70130,92532,000-30,000321,5-31,96831,73230,99430,84430,34429,920-30,37630,67631,02631,22632,000-30,500333,5-32,96832,54330,69530,48329,17928,327-29,21129,77130,72731,00733,000-29,500333-32,95232,57731,00330,80329,70428,955-29,75230,25231,05131,31633,000-30,000332-32,96232,68231,66331,49330,79730,261-30,83531,21031,70131,92533,000-31,000331,5-32,96832,73231,99431,84431,34430,920-31,37631,67632,02632,22633,000-31,500331-32,97432,79432,32432,19931,89131,583-31,91732,15332,35032,52033,000-32,000330,75-32,97832,83832,49132,37932,16631,917-32,18832,37832,51332,66333,000-31,250351,5-34,96834,73233,99433,84433,34433,920-33,37633,67634,02634,22635,000-33,500364-35,94035,46533,34233,11831,61030,654-31,67032,27033,40233,70236,000-32,000363-35,95235,57734,00333,80332,70431,955-32,75233,25234,05134,31636,000-33,000362-35,96235,68234,66334,49333,79733,261-33,83534,21034,70134,92536,000-34,000361,5-35,96835,73234,99434,84434,34433,920-34,37634,67635,02635,22636,000-34,500361-35,97435,79435,32435,19934,89134,583-34,9173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85,000-281,0002853-284,952284,577283,003282,753281,704280,905-281,752282,252283,051283,386285,000-282,0002906-289,920289,320286,023285,708283,425282,012-283,505284,305286,103286,528290,000-284,0002904-289,940289,465287,342287,062285,610284,598-285,670286,270287,402287,777290,000-286,0002903-289,952289,577288,003287,753286,704285,905-286,752287,252288,051288,386290,000-287,0002956-294,920294,320291,023290,708288,425287,012-288,505289,305291,103291,528295,000-289,0002954-294,940294,465292,342292,062290,610289,598-290,670291,270292,402292,777295,000-291,0002953-294,952294,577293,003292,753291,704290,905-291,752292,252293,051293,386295,000-292,0003008-299,900299,190294,704294,349291,240289,421-291,340292,340294,804295,279300,000-292,0003006-299,920299,320296,023295,708293,425292,012-293,505294,305296,103296,528300,000-294,0003004-299,940299,465297,342297,062295,610294,598-295,670296,270297,402297,777300,000-296,0003003-299,952299,577298,003297,753296,704295,905-296,752297,252298,051298,386300,000-297,000Size mmPitch mmmaxminmaxminmaxminminmaxminmaxminNote**Tap DrillMajor DiaPitch DiaMinor DiaMinor DiaPitch DiaMajor Diad=D-mmd2=D2 -mm.d3 -mmD1 -mmd2=D2 -mm.d=D-mmExternal (bolt thread)- 6g ClassInternal (nut thread)- 6H Class

Form m.m.ISO form screw threads 1,6mm to 300mmImportant Note: This page includes only selected data relative to the relevant subject.More complete data including full details of selection of tolerances is found in the relevant listed standardsRelevant StandardsBS ISO 965-1:1998 ...ISO general purpose metric screw threads. Tolerances (g.p.s.t.T). Principles and basic dataBS ISO 965-2:1998 ...ISO g.p.s.t.T . Limits of sizes for general purpose external and internal screw threads. Medium qualityBS ISO 261:1998 ...ISO general purpose metric screw threads. General planBS 3643 Part 1:2007..ISO metric screw threads. Principles and basic dataBS 3643 Part 2:2007..ISO metric screw threads. Specification for selected limits of sizeBS 3692:2001..ISO metric precision hexagon bolts, screws and nuts. SpecificationThread Form to BS 3643 /ISONote: In accordance with the requirements of BS EN ISO 898-1 for external fasteners of property class 8,8 and higher the root profile shall have non-reversing curvature, no part of the profile shall have a radius of less than 0,125P.It is advisable to attempt a truncation of H/6 as a basis for the calculation of the minor dia d3 when used in stress area calculatins .In BS 898-1 the value of d 3 is calculated as d 1 - H /6.....ref Thread Calculations.When specifying the screw thread on a drawing it is normal to using the conventionNominal size (say M20) x pitch (say 2)-Tolerance grade (say 5H for female and say 6h for male) e.g.M20 x 2 - 6H (Female ) or M20 x 2 - 6h female or M20 x 2 - 6H/6h thread CombinationFor first choice metric course threads with medium tolerances the pitch and tolerance grade does not need to be specified. these are listed belowThe threads identified below are the coarse threads .The pitch of these sizes need not be specifiedExample M6 x 1 can simply be specified on drawings as M6M1 x 0,25M1,2 x 0,25M1,4 x 0,30M1,6 x 0,35M1,8 x 0,35M2 x 0,4M2,2 x 0,45M2,5 x 0,45M2,5 x 0,45M3 x 0,5M3,5 x 0,6M4 x 0,7M4,5 x 0,75M5 x 0,8M6 x 1M7 x 1M8 x1,25M9 x1,25M10 x 1,5M11 x 1,5M12 x 1,75M14 x 2,0M16 x 2M18 x 2,5M20 x 2,5M22 x 2,5M24 x 3,0M27 x 3M30 x 3,5M33 x 3,5M36 x 4M39 x 4M42 x 4,5M45 x 5M48 x5M52 x 5M56 x5,5M60 x 5,5M64 x 6M68 x 6Ovennvnte og meget mere kan findes p sitet:http://www.roymech.co.uk/Useful_Tables/Screws/Screw_Threads_1.html

In BS 898-1 the value of d 3 is calculated as d 1 - H /6.....ref Thread Calculations

1.choiceScrew Pitch coarse :There are a number of pitch values for each screw diameter. The selection as to the pitch is based on the application.The largest pitch option for diameters M1 to M64 is identified as the coarse pitch and is to one used for general engineering applications.A table of the coarse pitch series is provided below. Other pitch values for each diameter are called the fine series or constant series.Fine series threads are only listed in the standards up to M33. The name fine does not imply higher quality.The fine series are listed below.M1 x 0,25M1,2 x 0,25M1,4 x 0,30M1,6 x 0,35M1,8 x 0,35M2 x 0,4M2,2 x 0,45M1 / M1,1/ M1,2 / M1,4 / M1,6 / M1,8 (x 0,2)M2 / M2,2 (x 0,25)M2,5 / M3 / M3,5 (x 0,35)M2,5 x 0,45M2,5 x 0,45M3 x 0,5M3,5 x 0,6M4 x 0,7M4,5 x 0,75M5 x 0,8M4 / M4,5 / M5,5 (x 0,5)M6 / M7( x 0,75)M8 x 1M6 x 1M7 x 1M8 x1,25M9 x1,25M10 x 1,5M11 x 1,5M12 x 1,75M10 / 12 (x 1,25)M14 / M16 / M18 / M20 / M22 (x 1,5)M24 / M25 / M27/ M30 / M33 (x 2)M14 x 2,0M16 x 2M18 x 2,5M20 x 2,5M22 x 2,5M24 x 3,0M27 x 3M30 x 3,5M33 x 3,5M36 x 4M39 x 4M42 x 4,5M45 x 5M48 x5The constant thread series are identified in the standards for the screw range M8 upwards and are normally those pitches not classed as coarse or fineM52 x 5M56 x5,5M60 x 5,5M64 x 6M68 x 6

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