JB/T 8825.2-1998 惠氏螺纹丝锥螺纹公差

ICs25.100.50J41中华人民共和国机械行业标准JB/T88252-1998惠氏螺纹丝锥螺纹公差Manufacturing tolerances on the threadedportion for whitworth threads taps1998-1229发布1999-07-01实施国家机械工业局发布JB/T88252-1998前言本标准参照英国标准BS9492-1979《丝锥规范(第二部分)统一螺纹的丝锥》中相关部分制订。螺纹尺寸极限偏差按BS949的有关规定,对个别有错误的尺寸进行了修改。半角偏差参照我国国家标准GBT9681994《丝锥螺纹公差》制订本标准于1998年12月29日首次发布。本标准的附录A是提示的附录。本标准由全国刀具标准化技术委员会提出并归口。本标准主要起草单位:上海刃具厂。中华人民共和国机械行业标准惠氏螺纹丝锥螺纹公差JB/8825.2-1998Manufacturing tolerances on the threadedportion for whitworth threads taps1范本标准规定了惠氏螺纹丝锥(以下简称丝锥)螺纹牙型和尺寸的极限偏差。本标准适用于加工惠氏螺纹的丝锥。2丝锥螺纹牙型和尺寸极限偏差丝锥螺纹牙型按图1所示,尺寸极限偏差在表1、表2中给出(丝锥大径上偏差,小径上、下偏差由制造厂自行规定)丝健公差螺纹基本牙注:d(D)一大径(公称直径)d(D1)—小径Es中径上偏差;Js—大径下偏差;4(D2)—中径中径公差Em—中径下偏差。图1国家机械工业局1998-1229批准1999-07-01实施表大径d中径d2每24m上蝶距偏差半角偏差△mmmmmmm254蠣距螺纹代号mmP|基本偏差(+)基本下偏差(+)上偏差(+)2级、3级2级、3开数mm尺寸尺寸切(+)2级磨3级磨切(+)2级磨|3级磨切|2级磨3级磨切级磨3/16242aw o os pna00320051003200160.03500160035005400570041006310.041002]0430.02100430.0650.070l/4-20BsW2012706350004500690.04555370.0230.0470.02300470.0710.0775/16-18Bs81.41793800480.0740.0487.0330.0240.0500.0240.050007600843/8-16161.5889.5250.05107900518.509002500530.0250.0530.080000T16141418141.1210.0540.08310054995200270056002700560.0850.0969612Bsw712|2772x012-12BsW0.08911.34400590059009001030059002914.2880091129310.0610610.0920106158750.09414.3970.0640641009601211|23090061006l00310.03l1746215984006500980n:0011±0076:203/4-0BsW|10|2.54019:05000640.090.064174240.0320.067003200670.1010120789BW928222225100680105006820419003400110.0340710.10701291-8BsW8|3.175|2540000720.1100.072233680.0360.07400360074020.1371 y-7BSW0117007800780.1170.467|3.6290077007700380.03811-7 BSW0.1l8007900790.1200152±35′5Bsw6421:0001l39006s00a16y-5Bsw|55080444001013700914196005001005009101370812-4BSW45|564|5080001410944-1861081061080061014|095表1(完)大径d中径d每254mm上螺距偏差半角偏差△g254螺距mm螺纹代号|mmP|基本下偏差(+)基本下偏差(+)上偏差(+)上牙mm尺寸2级、3级尺寸2级磨3级磨切2级磨3级磨切|2级磨3级磨切磨切2级、3(+)级磨444BSW2%4Bsw/4.6350}31500.15253.0830.1010.2080.1020.10200510051635000.154594330.1030103015502192%-3Bs0.I08372570.1093-3%BSW0.10900540.05476.200016471.552x-3yBsw±0.011±0.076±150.170775460.113%2-3%BSW7.8150.1130l30.0560.1710)0086人0.13016902210.1140.12026133-3 BSW922500.176898300.11801180.178027338467,0170170090059的4-3 BSW01200.1200.1800282表2每大径d中径d254mm上螺距偏差254螺距半角偏差Δg螺纹代号mmP基本下偏差(+)基本[下偏變(+)上偏差(+)上牙|mm尺寸尺寸级、3级2级磨3级磨切数2级磨3级磨切|2级磨3级磨切磨切级磨3/1632BsF320.7944762009600580036425400800400.01800410620067±307/3228BF2809075560.03800610.03849760019004200190042006500711/4-26 BSF0011±0076004426097700440.06800740040004000200020932-26BSF7144006565180045004500700077表2(续)大径d中径d每254mm上螺距偏差半角偏差△g254蠣距螺纹代号mmP|基本下偏差(+)基本下偏差(+)上偏差(+)2级、3级2级、上牙mm尺寸(+)/2级磨|3级磨幻尺寸切2级磨3级磨切|2级磨|3级磨级磨(+)5/16-2BsF221.5479370.04300690043119800220.0480.0220.04800743/820BsF201.27095250.04500730045871200230.0510.0230.0510.078c7/16-18BsF181.4l.1120.04800770048102080240.0530.0240.0530.0820.09312-16 BSF0081116840.05500550860.099161.5880.05005l002500259/16-16BSF1428800833271005700570.088|0.102±455/8-14 BSF15875008714.7140060006000920.108141.8140.0540.0540.027002711/1614BSF1630200610.0940.113/4-12BSF00941769300640.0980.17122170059005900290.02998∞13/16-12BsF20.63700951928l0.06500650.1000.121±0011±007678- 11 BSF11|2.309222250061|00980.06120.7470.0310.068003100680.1040.1261-10BF10254025.000.0640102064237740.03200700032007001080133-9 BSF28.575007400740.1130.1429|2.82268003400341°BsF00750750.116014813-8 BSF34.9250.1l43289300780.0780121|0.56±35′4B:|3 o0072[a6mz|30806【a6|[002o61-841.2750.l17392430081-714445042.1260084∞m01260167013001747'|3.629007700770.0380.038±15|±302-7 BSF48.476340.185表2(完)每大径d半角偏差△g254螺距螺纹代号P基本下偏差(+)基本下偏差(+)上偏差(+)上牙mm尺寸2级、3级尺寸2级磨3级磨|切2级磨3级磨切2级磨3级磨切磨级磨2Z-6BSF571500.13354.440009100910.4101982%6BsF|6423|63500108035003|60790091003|001|009301451|029698500.13767140009500950.14802183-5 BSF76.2000.1460100015502315.080009100910045004531-5BSF0.1487929±0011±0.076±15′±250.102010201580241-40.1540.1060.10601640.253X-4yBSE45 56(95 250 o0 Lass 00 [9166 0.04[0107004 .107 167 026244%Bs101.600.1570109[0.1690.271JB/88252-1998附录A(标准的附录)丝锥中径公差带与内螺纹中径公差带的对应关系A1丝锥中径公差带与内螺纹中径公差带的对应关系按图A1所示。内螺纹中径公差带普通级中等级丝健中径公差带级切制图