螺紋基本尺寸對照表

1、螺紋基本尺寸對照表 （以及螺紋底孔相關(guān)尺寸）參照機(jī)械設(shè)計師首冊編制 OPMSM2005年7月螺 紋 代 號 Thread code一、英制螺紋（螺紋牙型角55度）BSW英國標(biāo)準(zhǔn)惠氏螺紋（粗牙）BSF英國標(biāo)準(zhǔn)惠氏螺紋（細(xì)牙）G直管螺紋(外螺紋分A、B兩級即在螺紋中徑公差有所區(qū)別，絲錐分G、G-D)非密封性螺紋R錐管外螺紋（舊代號ZG；KG）RC錐管內(nèi)螺紋（舊代號ZG；KG）二、美制螺紋（螺紋牙型角60度） UNC統(tǒng)一制粗牙螺紋（代替NC）UNF統(tǒng)一制細(xì)牙螺紋（代替NF）UNEF統(tǒng)一制超細(xì)牙螺紋UN統(tǒng)一制不變螺距螺紋UNS統(tǒng)一制特殊螺紋三、美制螺紋（螺紋牙型角60度）NPT一般用途錐管螺紋（舊代號

2、Z、K）（斜角為1°47'即1：16）NPSC管接頭直管內(nèi)螺紋NPSM設(shè)備上自由配合，機(jī)械連接用直管螺紋NPTF干密封錐管螺紋NPSF干密封燃料內(nèi)螺紋NGT氣瓶用螺紋四、米制螺紋（螺紋牙型角60度，斜角為1°47'24"即1：16）ZM米制錐管螺紋五、其它螺紋SM縫紉機(jī)螺紋（螺紋牙型角60度，平頂、螺紋底部為園弧形）PZ氣瓶螺紋5V1至20V1氣門芯螺紋（螺紋牙型角60度，平頂、螺紋底部為園弧形）六、管螺紋（螺紋牙型角55度，螺紋頂、底部為園弧形約）RC圓錐內(nèi)螺紋（螺紋牙型角55度，斜角為1°47'即1：16）RP圓柱內(nèi)螺紋（螺紋

3、牙型角55度）R圓錐外螺紋（螺紋牙型角55度，斜角為1°47'即1：16）七、普通螺紋（螺紋牙型角60度）M普通螺紋代號八、特殊螺紋Tr梯形螺紋（螺紋牙型角30度）B鋸齒形螺紋（牙型角30×30度）螺紋公稱直徑d螺距P鉆頭直徑d銅不銹鋼204161602517517530525250352152154073333053535508414205454561495075525281256667177075717210158485125868716970757172121751011021510410512510610711091114211812151241251129

4、1316213814151441451149151825153155215816151641651169172025173175217818151841851189192225193195219820152042051209212432072122182215224225122923非螺紋密封英制英制錐管螺紋英制錐螺紋螺紋直徑牙數(shù)鉆頭直徑螺紋直徑牙數(shù)鉆頭直徑螺紋直徑牙數(shù)鉆頭直徑1/828881/828841/827861/4191171/4191121/4181113/8191523/8191473/8181451/2141891/2141831/2141793/4142443/4142363

5、/41423211130611429711152921-1/4113921-1/4113831-1/41153791-3/8114161-1/2114411-1/21154391-1/211451211558211556螺距(t)螺紋長度基面上螺紋直徑牙型高度(h1)有效長度基面長度外徑(d)中徑(d2)內(nèi)徑(d1)0.9194.59.739.158.570.581.3411613.1612.311.450.861.3412616.6615.8114.950.861.81157.520.9619.7918.631.161.81179.526.4425.2824.121.162.31191133

6、.2531.7730.291.482.31221341.9140.4338.951.482.31231447.8146.3344.851.482.31261659.6258.1456.661.482.313018.575.1973.7172.231.482.313220.587.8986.4184.931.482.313825.5113.03111.56110.081.48本螺紋基面上各直徑等于圓柱螺紋的各相應(yīng)直徑基面上螺紋內(nèi)徑 d1 = d - 1.28t3/4 = 26.44 - 1.28 * 1.81 = 24.12斜角（）1°47'24 錐角 （2tg)=1:16公稱

7、直徑（英寸）每英寸牙數(shù)（n)螺距(t)管子外徑（d)管接頭螺紋內(nèi)徑（d1')牙型高度(h1)名義尺寸最大外徑最小外徑名義尺寸最大內(nèi)徑最小內(nèi)徑 1/8280.919.739.689.388.578.928.670.58 1/4191.3413.1613.112.7411.4511.8411.560.86 3/8191.3416.6616.616.2414.9515.3515.060.86 1/2141.8120.9620.8920.518.6319.0518.751.16 5/8141.8122.9122.8522.4620.5921.0120.711.16 3/4141.8126.44

8、26.3825.9724.1224.5724.251.167/8141.8130.230.1429.7327.8828.3328.011.161112.3133.2533.1832.7530.2930.7930.431.481-1/4112.3141.9141.8441.3638.9539.4639.11.481-3/8112.3144.3344.2643.7841.3741.8741.511.481-1/2112.3147.8147.7447.2144.8545.4451.481-3/4112.3153.7553.6753.1450.7951.3450.941.482112.3159.625

9、9.5459.0156.6657.2156.811.482-1/2112.3175.1975.1174.5472.2372.8372.391.483 112.3187.8987.887.1984.9385.5885.11.48外徑d由公稱直徑所決定螺紋內(nèi)徑 d1 = d - 1.28t斜角（）1°47'24 錐角 （2tg)=1:16公稱直徑（英寸）每英寸牙數(shù)（n)螺距(t)螺紋長度基面上螺紋直徑牙型高度(h1)有效長度基面長度外徑(d)中徑(d2)內(nèi)徑(d1)1/16270.946.54.067.97.146.390.751/8270.9474.5710.279.528.7

10、70.751/4181.419.55.0813.5712.4411.311.133/8181.4110.56.117.0615.9314.81.131/2141.8113.58.1321.2219.7718.321.453/4141.81148.6126.5725.1223.671.45111-1/22.2117.510.1633.2331.4629.691.771-1/411-1/22.211810.6741.9940.2238.451.771-1/211-1/22.2118.510.6748.0546.2944.521.77211-1/22.211911.0760.0958.3356.56

11、1.77外徑d由公稱直徑所決定牙型高度 h1=0.8t基面上螺紋內(nèi)徑 d1 = d - 1.6t3/8 = 17.06mm d1=17.06 - 1.6 * 1.41 = 14.80斜角（）1°47'24 錐角 （2tg)=1:16公稱直徑每寸牙數(shù)螺距(t)外螺紋外徑內(nèi)螺紋內(nèi)徑選用鉆頭名義尺寸最大尺寸最小尺寸名義尺寸最大尺寸最小尺寸3/16241.064.634.54.243.563.973.713.71/4201.276.26.055.754.915.395.15.15/16181.417.787.627.316.346.866.556.53/8161.599.369.28

12、.97.738.297.977.97/16141.8110.9310.7510.459.069.679.339.31/2122.1212.512.311.910.310.9610.6110.59/16122.1214.0813.8713.4711.8912.5612.212.15/8112.3115.6515.4315.0313.2613.9413.613.53/4102.5418.8118.5718.1716.1716.9216.5416.47/892.8221.9621.721.219.0319.8219.4519.5183.1825.1124.8224.3221.822.6722.272

13、21-1/873.6328.2527.9327.3324.4625.4324.991-1/473.6331.4331.0930.4927.6428.5928.181-3/864.2334.5634.233.630.1331.2330.761-1/264.2337.7337.3636.7633.3134.3833.941-3/455.0844.0243.5942.7938.739.9539.451-7/84.55.6447.1546.6845.8841.2342.5842.0624.55.6450.3249.8449.0444.4145.7945.25內(nèi)螺紋（d）公稱直徑 3/4=19.05 mm外螺紋（d1） 內(nèi)徑 d-1.28 t 3/4=19.05 -1.28 * 2.54=15.79 mm外螺紋（d1） 內(nèi)徑 d-1.134 t 3/4=19.05 -1.134 * 2.54=16.16 mm公稱直徑 （英寸）每英寸牙數(shù)（n)螺 距(t)外螺紋外徑內(nèi)螺紋內(nèi)徑名義尺寸名義尺寸d =d'-0.075t-0.0511/16141.81417.2815.43/8201.279.388.087/8112.312219.65/8141