美国联邦螺蚊标准常用规格.doc

美国联邦螺蚊标准常用规格外螺纹内螺蚊 大径极限中径极限小径极限中径极限大径公称 尺寸 牙数螺蚊 系列 代号等级容隙最大最小最大最小公差小径等级最小最大最小最大公差最小备注123456789101112131415161718 0.625-18UNF2A0.00140.62360.61490.58750.58280.00470.55542B0.5650.5780.58890.59490.00600.625英寸 5/8”-18 15.83915.618 14.107 14.35114.681 15.875毫米 0.75-16UNF2A0.00150.74850.73910.70790.70290.00500.67182B0.6820.6960.70940.71590.00650.750英寸 3/4”-16 19.01218.773 17.064 17.32317.678 19.275毫米 0.8125-16UN2A0.00150.81100.80160.77040.76550.00490.73432B0.7450.7590.77190.77820.00630.8125英寸 13/16”-16 20.59920.726 18.651 18.92319.279 20.638毫米 1.00-12UNF2A0.00180.99820.98680.94410.93820.00590.89602B0.9100.9280.94590.95350.00761.000英寸 1”-12 25.35425.065 22.758 23.11423.571 25.40毫米 1.00-16UN2A0.00150.99850.98910.95790.95290.00500.92182B0.9320.9460.95940.96590.00651.000英寸 1”-16 25.36225.123 23.414 23.67324.028 25.40毫米 1.125-16UN2A0.00151.12351.11411.08291.07790.00501.04682B1.0571.0711.08441.09090.00651.125英寸 1 1/8”-16 28.53728.298 26.589 26.84827.203 28.575毫米 1.00-14dUNS2A0.00170.99830.99800.95190.94630.00560.91072B0.9230.9380.95360.96090.00731.000英寸 1”-14 25.35725.349 23.132 23.44423.825 25.40毫米 1.50-12UNF2A0.00191.49811.48671.44401.43760.00641.39592B1.4101.4281.44591.45220.00831.500英寸 1I/2”-12 38.05237.762 35.456 35.81436.271 38.1毫米 2.5-12UN2A0.00192.49812.48672.44402.43780.00622.39592B2.4102.4281.44592.45400.00812.5英寸 21/2”-12 63.45263.162 60.856 61.2161.671 63.5毫米C 型型 JIC37 度美制度美制 UNF 螺纹常用规格螺纹常用规格 -4-47/16”-2011.1111.1110.0310.03 -5-51/2”-2012.7012.7011.3211.32 -6-69/16”-1814.2814.2813.0813.08 -8-83/4”-1619.0019.0017.6817.68 -10-107/8”-1422.2222.2220.6820.68 -12-121(1/16)“-1226.9826.9825.1525.15 -16-161(5/16)“-1233.3333.3331.531.5 -20-201(5/8)“-1241.2841.2839.4439.44 -24-241(7/8)“-1247.6247.6245.845.8 -32-322(1/2)“-1263.563.561.6761.67美制圆锥管螺纹（美制圆锥管螺纹（NPT）） 1/8”-2710.2410.244 4 1/4”-1813.6013.604 4 3/8”-1817.0417.044.324.32 1/2”-1421.2221.224.484.48 3/4”-1426.5726.574.754.75 1”-11(1/2)”33.2233.224.64.6 1(1/4)”-11.541.9641.964.834.83A 型美制螺纹（型美制螺纹（UNF）常用规格）常用规格 外螺纹外螺纹内螺纹内螺纹 -4-49/16“-19 牙牙14.2814.2813.0813.08 -6-611/16''-1617.4617.4616.116.1 -8-813/16''-1620.6420.6419.2819.28 -10-101''-1425.4025.4023.5723.57 -12-121(3/16)''-1230.0030.0028.3228.32 -16-161(7/16)''-1236.5136.5134.6734.67 -20-201(11/16)''-1242.8642.8641.0241.02英制圆柱管螺纹（英制圆柱管螺纹（BSPP）常用规格）常用规格 -4-41/4”-1913.15713.15711.55-6-63/8”-1916.66216.66214.95-8-81/2”-1420.95520.95518.63-12-123/4”-1426.44126.44124.11-16-161”-1133.24933.24930.29-20-201(1/4)''-1141.9141.9138.95英制圆锥管螺纹（英制圆锥管螺纹（BSPT）常用规格）常用规格 基面大径基面大径基准距离基准距离 1/4”-1913.15713.1576 6 3/8”-1916.66216.6626.46.4 1/2”-1420.95520.9558.28.2 3/4”-1426.44126.4419.59.5 1”-1133.24933.24910.410.4 1(1/4)''-1141.9141.9112.712.7NPT 螺纹螺纹 PT 螺纹螺纹 G 螺纹和公制螺纹的区别螺纹和公制螺纹的区别NPT，PT，G 都是管螺纹．都是管螺纹．NPT 是 National (American) Pipe Thread 的缩写，属于美国标准的 60 度锥管螺纹，用于北美地区．国家标准可查阅 GB/T12716-1991PT 是 Pipe Thread 的缩写，是 55 度密封圆锥管螺纹，属惠氏螺纹家族，多用于欧洲及英联邦国家．常用于水及煤气管行业，锥度规定为 1:16． 国家标准可查阅 GB/T7306-2000G 是 55 度非螺纹密封管螺纹，属惠氏螺纹家族．标记为 G 代表圆柱螺纹．国家标准可查阅 GB/T7307-2001另外螺纹中的 1/4、1/2、1/8 标记是指螺纹尺寸的直径，单位是英吋．行内人通常用分来称呼螺纹尺寸，一吋等于８分，1/4 吋就是２分，如此类推．G 就是管螺纹的统称(Guan)，55，60 度的划分属于功能性的，俗称管圆。

即螺纹由一圆柱面加工而成ZG 俗称管锥，即螺纹由一圆锥面加工而成，一般的水管接头都是这样的，国标标注为 Rc公制螺纹用螺距来表示，美英制螺纹用每英寸内的螺纹牙数来表示，这是它们最大的区别，公制螺纹是 60 度等边牙型，英制螺纹是等腰 55 度牙型，美制螺纹 60 度公制螺纹用公制单位， 美英制螺纹用英制单位管螺纹主要用来进行管道的连接，其内外螺纹的配合紧密，有直管与锥管两种公称直径是指所连接的管道直径，显然螺纹直径比公称直径大1/4，1/2，1/8 是英制螺纹的公称直径，单位是英寸英制管螺纹美制管螺纹对照表英制管螺纹美制管螺纹对照表英制管螺纹英制管螺纹美制管螺纹钻孔径标准径钻孔径NPT 规格标准径最大最小规格 使用纹刀时不用纹刀时有交牙部之长度（最小）中之毋螺牙内径标准长度（最小）中之毋螺牙内径规格 使用绞刀时不用绞刀时NPSPS 1/16-286.5 6.632 6.49PT 1/16-286.16.26.2446.3841/16 - 276.16.25 6.35PS 1/8-288.5 8.637 8.495PT 1/8-288.18.28.2498.3882001-8-278.33 8.43 8.74PS 1/4-1911.411.54911.341PT 1/4-1910.71110.96211.1742001-4-1810.7211.1311.13PS 3/8-191515.05414.846PT 3/8-1914.214.514.44814.6582003-8-1814.2714.2714.68PS 1/2-1418.518.77318.489PT 1/2-1417.61817.97918.2632001-2-1417.4817.8618.26PS 3/4-142424.25923.975PT 3/4-142323.523.37823.6632003-4-1422.6323.0123.42PS 1-11 30.230.47130.111PT 1-11 2929.529.45929.8221 - 11-1/228.5828.9829.36PS 1-1/4-1138.839.13238.772PT 1-1/4-1137.53837.97638.3391-1/4-11-1/237.3137.6938.1PS 1-1/2-1144.845.02544.665PT 1-1/2-1143.44443.86944.2321-1/2-11-1/243.6644.0444.45PS 2 - 1156.556.83656.476PT 2 - 1154.955.555.41255.844球轴承附件Bearing No.dmminDBiBenmGdsUC2031747311712.718.35.0M6x0.751/4-28UNFUC203-11 17.4625 11/16 47 31 17 12.7 18.3 5.0 M6x0.751/4-28UNF UC204-12UC204 19.050020 3/44747 3131 1717 12.712.7 18.318.3 5.05.0 M6x0.75M6x0.751/4-28UNF1/4-28UNF UC205-14UC205-15UC205UC205-16 22.225023.81252525.4000 7/815/161 52525252 3434343417171717 14.314.314.314.3 19.819.819.819.8 5.55.55.55.5 M6x0.75M6x0.75M6x0.75M6x0.75 1/4-28UNF1/4-28UNF 1/4-28UNF1/4-28UNF UC206-17UC206-18UC206UC206-19UC206-20 26.987528.57503030.162531.7500 1-1/161-1/81-3/161-1/4 6262626262 38.138.138.138.138.1 191919191915.915.915.915.915.922.222.222.222.222.26.06.06.06.06.0 M6x0.75M6x0.75M6x0.75M6x0.75 M6x0.751/4-28UNF1/4-28UNF 1/4-28UNF1/4-28UNF 1/4-28UNF UC207-20UC207-21UC207-22UC207UC207-23 。