JB T 8824.2-2012統(tǒng)一螺紋刀具第2部分絲錐螺紋公差

備案號：36560—2012代替JB/T8824.2—1998統(tǒng)一螺紋刀具第2部分：絲錐螺紋公差 2012-05-24發(fā)布IJB/T8824.2—2012前言 Ⅱ 12絲錐螺紋公差 1參考文獻 5表1統(tǒng)一螺紋粗牙絲錐螺紋尺寸極限偏差 2表2統(tǒng)一螺紋細牙絲錐螺紋尺寸極限偏差 3I 在“范圍”中增加“統(tǒng)一螺紋螺母絲錐(以下簡稱螺母絲錐)” 將表1～表4合并為表1、表2,重新修訂絲錐中徑偏差，將“牙型半角”修改為“牙側角”,修改絲錐螺距極限偏差和牙側角極限偏差，取消大徑d的上偏差(由制造廠自行規(guī)定),并修改——取消了“附錄A”;1統(tǒng)一螺紋刀具第2部分：絲錐螺紋公差JB/T8824的本部分規(guī)定了統(tǒng)一螺紋絲錐(以下簡稱絲錐)和統(tǒng)一螺紋螺母絲錐(以下簡稱螺母絲錐)的螺紋牙型和尺寸的極限偏差。絲錐的螺紋牙型和尺寸極限偏差按圖1和表1、表2的規(guī)定(大徑上極限偏差由制造廠自行規(guī)定)。d(D)=大徑(公稱直徑)一大徑下極限偏差Em=中徑的下極限偏差d?(D?)=中徑E?=中徑的上極限偏差JB/IJB/I8824.2-2012表1統(tǒng)一螺紋粗牙絲錐螺紋尺寸極限偏差螺紋代號每25.4mm上牙數螺距Pmm螺距極限偏差mm牙側角極限偏差△a/2下極限偏差J(+)上極限偏差測量牙數個磨制切制磨制切制下極限偏差Em(+)上極限偏差E,(+)下極限偏差Em(+)上極限偏差E(+)下極限偏差Em(+)上極限偏差E,(+)下極限偏差Em(+)上極限偏差E(+)No.1-64UNC0.3970.021自行規(guī)定0.0100.0190.0130.0260.00510.0305No.2-56UNC0.4540.0240.0110.0210.0140.028No.3-48UNC0.5290.0290.0220.0150.030No.4-40UNC0.6350.0340.0120.0240.0170.0330.0432No.5-40UNC0.0130.025No.6-32UNC0.7940.0430.0140.0270.0190.0380.01270.05089士0.025No.8-32UNC0.0280.039No,10-24UNC0.0570,0160.0320.0220.044No.12-24UNC0.0170.0330.0451/4-20UNC0.0690.0180.0370.0250.0500.0370.0740.06355/16-18UNC0.0760.0200.0400,0270.0540.0400.08073/8-16UNC0.0860.0220.0440.0290.0580.0430.0867/16-14UNC0.0980.0230.0470.0310.0620.0470.0930.07621/2-13UNC0.1060.0240.0490.0330.0660.0490.0989/16-12UNC2.1170.1140.0260.0520.0350.0690.0520.1045/8-11UNC2.3090.1250.0270.0550.0370.0730.0540.1093/4-10UNC2.5400.1370.0290.0580.0390.0780.0580.1170.08897/8-9UNC92.8220.1520.0310.0620.0420.0830.0620.1250.02540.1016土0.01283.1750.1710.0340.0670.0450.0890.0670.13473.6290.1960.0360.0720.0480.0960.0720.1430.1143114-7UNC0.0370.0730.0490.0980.0730.1453/g-6UNC64,2330.2290.0400.0790.0530.1060.0790.15811/z-6UNC0.0800.1070.0800.160JB/TJB/T8824.2—2012螺紋代號每上牙數螺距Pmm中徑d?mm螺距極限偏差mm牙側角極限偏差△a/2下極限偏差上極限偏差3B級磨制1B級磨制測量牙數個磨制切制1B級磨制切制下極限偏差上極限偏差下極限偏差上極限偏差下極限偏差上極限偏差下極限偏差上極限偏差5自行規(guī)定7 4土0.018各級絲錐小徑d?均應小于被加工內螺紋的最小小徑，而且隨著牙底圓弧亦不應超過內螺紋的最小小徑，即圖1中AB線位置。表2統(tǒng)一螺紋細牙絲錐螺紋尺寸極限偏差螺紋代號每上牙數螺距Pmm螺距極限偏差mm牙側角極限偏差△a/2下極限偏差J(+)上極限偏差3B級磨制2B級磨制1B級磨制測量牙數個1B級磨制切制磨制切制下極限偏差Em(+)上極限偏差E(+)下極限偏差Em(+)上極限偏差E(+)下極限偏差Em(+)上極限偏差下極限偏差Em(+)上極限偏差Vo.0-80UNF自行規(guī)定——0.00510.0305土0.008土0.02土50'No.1-72UNFNo.2-64UNFNo.3-56UNFNo.4-48UNF0.0432No.5-44UNFJB/T8824.2-2012JB/T8824.2-2012螺紋代號每上牙數螺距P螺距極限偏差mm牙側角極限偏差△a/2下極限偏差上極限偏差測量牙數個磨制切制磨制切制下極限偏差上極限偏差下極限偏差上極限偏差下極限偏差上極限偏差下極限偏差上極限偏差No.6-40UNF自行規(guī)定Vo.8-36UNF9No.10-32UNF7土0.035土0.009各級絲錐小徑d均應小于被加工內螺紋的最小小徑，而且隨著牙底圓弧亦不應超過內螺紋的最小小徑，即圖1中AB線位置。5統(tǒng)一螺紋刀具第2部分；絲錐螺紋公差中機械工業(yè)出版社出版發(fā)行北京市百萬