英制管螺纹尺寸.doc

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1、用螺纹密封的管螺纹基本尺寸(R)尺寸代号每英寸牙数螺距基准面上的基准尺寸基准距离有效螺纹长度大径小径1/16280.9077.7236.5614.06.51/8280.9079.7288.5664.06.51/4191.33713.15711.4456.09.73/8191.33716.66214.9506.410.11/2141.81420.95518.6318.213.23/4141.81426.44124.1179.514.51112.30933.24930.29110.416.81¼11

2、2.30941.91038.95212.719.11½112.30947.80344.84512.719.12112.30959.61456.65615.923.42½112.30975.18472.22617.526.73112.30987.88484.92620.629.83½112.309100.33097.37222.231.44112.309113.030110.07225.435.85112.309138.430135.47228.640.16112.309163.830160.87

3、228.640.1R—密封用管螺纹：Rc-圆锥内螺纹Rp-圆柱内螺纹R-圆锥外螺纹G—非密封用管螺纹60°圆锥管螺纹基本尺寸(NPT)尺寸代号每英寸牙数螺距基准面上的基准尺寸基准距离装配余量(牙数)大径小径1/16270.9417.8956.3894.06431/8270.94110.2428.7364.10231/4181.41113.61611.3585.78633/8181.41117.05514.7976.09631/2141.81421.22318.3218.12833/4141.81

4、426.56823.6668.6113111.52.20933.22829.69410.16031¼11.52.20941.98538.45110.66831½11.52.20948.05444.520106683211.52.20960.09256.55811.07432½83.17572.69967.61917.3232383.17588.60883.52819.45623½83.175101.31696.23620.8532483.175113.973108.87221.4382583.1

5、75140.952135.87223.8002683.175167.792162.71224.3332管螺纹名称、代号对照表螺纹角度新国标旧国标国外标准备注55°GGBSPF(BSPP)平RPRCZGBSPT锥R60°NPTZNPT锥新国标代号意义：G—不用螺纹密封的圆柱管螺纹R—用螺纹密封的管螺纹RP—圆柱内螺纹RC—圆锥内螺纹R—圆锥外螺纹NPT—60°圆锥管螺纹旧国标代号意义：G—圆柱螺纹ZG—圆锥螺纹Z—圆锥螺纹国外标准代号意义：BSP—英制管螺纹BSPT—圆锥螺纹BSPF(BSPP)—

6、圆柱螺纹NPT—美制管螺纹NPT--圆锥螺纹