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1、螺纹精度等级与尺寸公差解析計算六角形面積公式30ABC六角形面積=1/2√3S2X3=√3/2S2=0.866025S2三角形ABC面積=½(1/√3SXS)=1/2√3S2Nutthread螺紋有效徑計算PitchDia.=D-2X3/8H=D-3/4X0.866025P=D-0.649519PBoltthread60o螺距p有效徑陽螺紋大徑(螺絲外徑)陰螺紋小徑(螺帽孔徑)1/4H1/8HHH=0.866025PMajorDia.PitchDia.MinorDia.1/2H{3/8HBasicthreadprofile-MetricNutthreadBasicProfile(Zer
2、oLine)Boltthread螺紋公差ToleranceNutBolt60o學會計算基本螺紋尺寸(I)M6X1.0-6HbasicPitchDiameter,MinorDiameterM6X1.0-6g之PitchDiameter,MajorDiameterBasicPitchDia.=D-2X3/8H=D-3/4X0.866025P=D-0.649519P=6-0.649519X1.0=5.350BasicMinorDia.=D-2X5/8H=D-5/4X0.866025P=D-1.083P=6-1.083X1.0=4.917BasicPitchDia.=D-2X3/8H=D-3/
3、4X0.866025P=D-0.649519P=6-0.649519X1.0=5.350g=-26u5.350–0.026=5.3246級1.0boltPDtolerance=112u5.324–0.112=5.212g=-26u6.000–0.026=5.9746級1.0boltMDtolerance=180u5.974–0.180=5.794學會計算基本螺紋尺寸(II)M6X0.75–6e之PitchDiameter,MajorDiameterM6X0.75-6g之PitchDiameter,MajorDiameterBasicPitchDia.=D-2X3/8H=D-3/4X0.
4、866025P=D-0.649519P=6-0.649519X0.75=5.513BasicPitchDia.=D-2X3/8H=D-3/4X0.866025P=D-0.649519P=6-0.649519X0.75=5.513g=-22u5.513–0.022=5.4916級0.75boltPDtolerance=100u5.491–0.100=5.391e=-56u6.000–0.056=5.9446級0.75boltMDtolerance=140u5.944–0.140=5.804e=-56u5.513–0.056=5.4576級0.75boltPDtolerance=100u5
5、.457–0.100=5.357g=-22u6.000–0.022=5.9786級0.75boltMDtolerance=140u5.978–0.140=5.837Threadtoleranceposition-Metric5H7H6HZeroLine基準線（零線）4h6g8g電鍍餘隙AllowancegfNutthreadBoltthreade6eM6X0.75-22-38-56TechnicaldataFastenerstolerancesISO4759ISOtolerancesTolerancesh14h13h13+2Pjs15js14Example:SizeM6X25Hexag
6、onnutsweightcalculationS對邊m厚度六角螺帽重量g/pc=(六角面積-圓面積)X厚度X7.85g/1,000圓面積=π/4XPitchDia.2DINISO2768-1Tolerance-Class(Linemeasurement)Limitsinmmfornominalsizesinmm0,5to3above3to6above6to30above30to120above120to400above400to1000above1000to2000above2000to4000f(fine)±0,05±0,05±0,1±0,15±0,2±0,3±0,5-m(mediu
7、m)±0,1±0,1±0,2±0,3±0,5±0,8±1,2±2c(coarse)±0,15±0,2±0,5±0,8±1,2±2±3±4v(verycoarse)-±0,5±1±1,5±2,5±4±6±8ToleranceClass(radiusandchamfer)Limitsinmmfornominalsizesinmm0,5to3above3to6above6f(finne)±0,2±0,5±1m(medium)c(coarse)±0,4
