螺紋的技術(shù)標(biāo)準(zhǔn)

目錄TOC\o"1-5"\h\z修訂履歷3介紹41.1目的4範(fàn)圍4螺牙8定義6分類(lèi)82.3精度等級(jí)82.4螺紋標(biāo)注92.5基本尺寸10鋁合金10鋁合金成分10公差12ISO12JIS12DIN12GB145參考文件15修訂履歷1.介紹目的定義產(chǎn)品的外觀信息,包括:裝配的公差,特殊的外觀要求以及在允許范圍內(nèi)的和通用標(biāo)準(zhǔn)的偏差。范圍適用于公司所生產(chǎn)的所有壓鑄件產(chǎn)品，客戶(hù)特別規(guī)定的除外。2.螺牙2.1定義螺紋：在圓柱或圓錐表面上,沿著螺旋線所形成的具有規(guī)定牙形的連續(xù)凸起。內(nèi)螺紋：在圓柱或圓錐內(nèi)表面上所形成的螺紋。外螺紋：在圓柱或圓錐外表面上所形成的螺紋。有效螺紋：由完整螺紋和不完整螺紋組成的螺紋，不包括螺尾。公稱(chēng)直徑：代表螺紋尺寸的直徑。大徑：與外螺紋牙頂或內(nèi)螺紋牙底相切的假想圓柱或圓錐的直徑。用d（外螺紋）或D（內(nèi)螺紋）表示。中徑：一個(gè)假想圓柱或圓錐的直徑，該圓柱或圓錐的母線通過(guò)牙形上溝槽和凸起寬度相等的地方。該假想圓柱或圓錐稱(chēng)為中徑圓柱或中徑圓錐。中徑用d2（外螺紋）或D2（內(nèi)螺紋）表示。小徑：與外螺紋牙底或內(nèi)螺紋牙頂相切的假想圓柱或圓錐的直徑。用di（外螺紋）或D1（內(nèi)螺紋）表示。螺距：相鄰兩牙在中徑線上對(duì)應(yīng)兩點(diǎn)間的軸向距離。螺紋精度：由螺紋公差帶和旋合長(zhǎng)度共同組成的衡量螺紋質(zhì)量的綜合指標(biāo)。旋向：螺紋有右旋和左旋兩種。內(nèi)外螺紋旋合時(shí)，順時(shí)針旋入的為右旋，逆時(shí)針旋入的為左旋。2.2分類(lèi)螺紋密封（55°）非螺紋密封（55°）60°,1°47〃55°1°7〃圓柱內(nèi)螺紋圓柱管螺紋圓錐管螺紋圓柱管螺紋圓錐內(nèi)螺紋圓錐外螺紋英制RcRRp/Ps（舊）G/PFPT美制NPS美制NPSNPT國(guó)標(biāo)RcRRp/PsG/PFNPT類(lèi)型牙型放大圖特征

代號(hào)標(biāo)注示例用途及說(shuō)明最常用的一種聯(lián)接螺紋，直徑相同時(shí)，細(xì)牙螺紋的螺距比粗牙螺紋的螺距小，粗牙螺紋不注螺距管道聯(lián)接中的常用螺紋，螺距及牙型均較小，其尺寸代號(hào)以in為單位，近似地等于管子的孔徑。螺紋的大徑應(yīng)從有關(guān)標(biāo)準(zhǔn)中查出，代號(hào)R表示圓錐外螺紋，R表示C圓錐內(nèi)螺紋，R表P類(lèi)型牙型放大圖特征

代號(hào)標(biāo)注示例用途及說(shuō)明最常用的一種聯(lián)接螺紋，直徑相同時(shí)，細(xì)牙螺紋的螺距比粗牙螺紋的螺距小，粗牙螺紋不注螺距管道聯(lián)接中的常用螺紋，螺距及牙型均較小，其尺寸代號(hào)以in為單位，近似地等于管子的孔徑。螺紋的大徑應(yīng)從有關(guān)標(biāo)準(zhǔn)中查出，代號(hào)R表示圓錐外螺紋，R表示C圓錐內(nèi)螺紋，R表P示圓柱內(nèi)螺紋梯形螺紋TrvjN上一C-JI匚常用的兩種傳動(dòng)螺紋，用于傳遞運(yùn)動(dòng)和動(dòng)力，梯形螺紋可傳遞雙向動(dòng)力，細(xì)螺紋粗螺紋超細(xì)螺紋公制M英制UNFUNCUNEF常用螺紋的種類(lèi)2.3精度等級(jí)螺紋精度是由螺紋公差帶和旋合長(zhǎng)度共同組成的衡量螺紋質(zhì)量的綜合指標(biāo)。螺紋公差帶代號(hào)包括中徑公差帶與頂徑公差帶代號(hào)。公差帶代號(hào)是由表示其大小的公差等級(jí)數(shù)字和表示其位置的字母組成。如6H,6g等。螺紋公差帶代號(hào)標(biāo)注在螺紋代號(hào)之后，中間用一分開(kāi)。如螺紋的中徑公差帶與頂徑公差帶代號(hào)不同，則分別注出。前者表示中徑公差帶，后者表示頂徑公差帶。如螺紋的中徑公差帶與頂徑公差帶代號(hào)相同，則只注一個(gè)代號(hào)。名稱(chēng)螺紋等級(jí)螺紋種類(lèi)國(guó)家標(biāo)準(zhǔn)公制牙JIS1級(jí)2級(jí)3級(jí)公螺紋ISO4h6g8g母螺紋4H.5H5H.6H7H美制牙公螺紋JIS3A2A1AISO母螺紋JIS3B2B1BISO英制牙2級(jí)3級(jí)4級(jí)2.4螺紋標(biāo)注當(dāng)螺紋精度要求較高時(shí)，除標(biāo)注螺紋代號(hào)外，還應(yīng)標(biāo)注螺紋公差帶代號(hào)和螺紋旋合長(zhǎng)度。2.4.1螺紋標(biāo)記的標(biāo)注格式為：螺紋代號(hào)——螺紋公差帶代號(hào)（中徑、頂徑）——旋合長(zhǎng)度1）公差帶代號(hào)由數(shù)字加字母表示（內(nèi)螺紋用大寫(xiě)字母，外螺紋用小寫(xiě)字母），如7H、6g等，應(yīng)特別指出，7H，6g等代表螺紋公差，而H7，g6代表圓柱體公差代號(hào)。2）旋合長(zhǎng)度規(guī)定為短（用S表示）、中（用N表示）、長(zhǎng)（用L表示）三種。一般情況下，不標(biāo)注螺紋旋合長(zhǎng)度，其螺紋公差帶按中等旋合長(zhǎng)度（N）確定。必要時(shí)，可加注旋合長(zhǎng)度代號(hào)S或L,如“M20-5g6g—L”。特殊需要時(shí)，可注明旋合長(zhǎng)度的數(shù)值，如“M20-5g6g—30”。2.4.2、普通螺紋普通粗牙螺紋：特征代號(hào)M+公稱(chēng)直徑+旋向+螺紋公差帶代號(hào)（中徑、頂徑）一一旋合長(zhǎng)度普通細(xì)牙螺紋：特征代號(hào)M+公稱(chēng)直徑*螺距+旋向+螺紋公差帶代號(hào)（中徑、頂徑）——旋合長(zhǎng)度右旋螺紋省略不注，左旋用“LH”表示。M16—5g6g表示粗牙普通螺紋，公稱(chēng)直徑16,右旋，螺紋公差帶中徑5g,大徑6g，旋合長(zhǎng)度按中等長(zhǎng)度考慮。M16x1LH—6G表示細(xì)牙普通螺紋，公稱(chēng)直徑16,螺距1,左旋，螺紋公差帶中徑、大徑均為6G，旋合長(zhǎng)度按中等長(zhǎng)度考慮。2.4.3、管螺紋的標(biāo)注

格式為：特征代號(hào)（圓柱管螺紋用G表示，圓錐管螺紋用NPT表示）+尺寸代號(hào)+公差等級(jí)代號(hào)+旋向G1A--LH表示英制非螺紋密封管螺紋，尺寸代號(hào)1in，右旋，公差等級(jí)為A級(jí)。Rcl/2表示英制螺紋密封錐管螺紋，尺寸代號(hào)l/2in，右旋?；境叽?.5.1公制螺紋公制細(xì)牙內(nèi)螺紋規(guī)格標(biāo)準(zhǔn)徑公制細(xì)牙內(nèi)螺紋規(guī)格標(biāo)準(zhǔn)徑6H精度DmaxDminM2.5*0.352.152.1842.121M3.0*0.352.652.6842.621M3.5*0.353.153.2213.121M4.0*0.503.503.5993.459M4.5*0.504.004.0993.959M5.0*0.504.504.5994.459M5.5*0.505.005.0994.959M6.0*0.755.255.3785.188M7.0*0.756.256.3786.188M8*0.757.257.3787.188M8*1.007.007.1536.917M9*0.758.258.3788.188M9*1.008.008.1537.917M10*0.759.259.3789.188M10*1.009.119.1538.917M10*1.258.758.9128.647Mll*0.7510.2510.37810.188Mll*1.0010.0010.1539.917M12*1.0010.7510.91210.647M12*1.2510.5010.67610.376M12*1.5011.0011.15310.917M14*1.0013.0013.15312.917M14*1.2512.7512.91212.647M14*1.5012.5012.67612.376M15*1.014.0014.15313.917M15*1.5013.5013.67613.376M16*1.015.0015.15314.917M16*1.5014.5014.67614.376M17*1.016.0016.15315.917M17*1.5015.5016.67615.376公制粗牙內(nèi)螺紋規(guī)格標(biāo)準(zhǔn)徑6H精度DmaxDminM1.4*0.31.101.161.075M1.6*0.351.251.3211.221M1.8*0.351.451.5211.421M2.0*0.41.601.6791.567M2.2*0.451.751.8381.713M2.5*0.452.052.1382.013M3.0*0.52.502.5992.459M3.5*0.62.903.012.85M4.0*0.73.303.4223.242M4.5*0.753.753.8783.688M5.0*0.84.204.3344.134M5.5*0.55.005.0994.959M6.0*1.005.005.1534.917M7.0*1.006.006.1535.917M8.0*1.256.756.9126.647M9.0*1.257.757.9127.647M10*1.508.508.6768.376Mll*1.509.509.6769.376M12*1.7510.2510.4410.106M14*2.0012.0012.2111.835M15*1.5013.5013.67613.375M16*2.0014.0014.2113.835M17*1.5015.5015.67615.376M18*2.5015.5015.74415.294M20*2.5017.5017.74417.294M22*2.5019.5019.74419.294M24*3.0021.0021.25220.752M27*3.0024.0024.25223.752M30*3.5026.5026.77126.211公稱(chēng)尺寸大徑中徑小徑UNC粗牙UNF公稱(chēng)尺寸大徑中徑小徑UNC粗牙UNF細(xì)牙0-801.5241.3181.1811-641.8541.5981.4251-721.8541.6261.4372-562.1841.891.6942-642.1841.9281.7553-842.5152.1721.9413-562.5152.222.0244-402.8452.4332.1564-482.8452.5022.2715.5.2統(tǒng)一標(biāo)準(zhǔn)螺紋公稱(chēng)尺寸大徑中徑小徑UNC粗牙UNF細(xì)牙'9/16-1214.28812.91311.996'9/161814.28813.37112.761‘5/1114.87514.37613.376‘5/81814.87514.95814.348'3/4-1019.05017.39916.301‘3/41619.05018.01917.337‘7/8-922.22520.39119.169'7/81422.22521.04620.265'1-825.40023.33821.963M18*1.516.5016.67616.376M18*2.016.0016.2115.835M20*1.019.0019.15318.917M2O*1.5O18.5018.67618.376M20*2.018.0018.2117.835M22*1.021.0021.15320.917M22*1.5020.5020.67620.376M22*2.020.0020.2119.835M24*1.023.0023.15322.917M24*1.5022.5022.67622.376M24*2.022.0022.2121.835M25*1.024.0024.15323.917M25*1.523.5023.67623.376M25*2.023.0023.2122.835M26*1.5024.5024.67624.376M27*1.026.0026.15325.917M27*1.525.5025.67625.376M28*1.027.0027.15326.917M28*1.526.5026.67626.376M28*2.026.0026.2125.835M30*1.029.0029.15328.917M3O*1.5O28.5028.67628.376M30*2.028.0028.2127.835M30*3.027.0027.25226.752

5-403.1752.7642.487‘1-1225.40024.02623.1095-443.1752.7092.55111/8-728.57526.21824.6486-323.5052.992.64711/81228.57527.20126.2846-403.5053.0942.81711/4-731.75029.39327.8238-324.1643.653.30711/41231.75030.37629.4598-364.1643.7083.40113/8-634.92532.17430.343‘10-244.8264.1383.6813/81234.92533.55132.63410-324.8264.313.96711/2-638.10035.34933.518‘12-245.4864.7984.34111/21238.10036.72635.809‘12-285.4864.8974.50313/4-544.45041.15138.951'1/4-206.355.5244.972-41/250.80047.13544.690'1/4-286.355.7615.36721/4-41/257.15053.48551.0395/16-187.9387.0216.41121/2-463.50059.37556.626‘5/16247.9387.2496.79223/4-469.85065.72562.976'3/8-169.5258.4947.805‘3/476.20072.07569.326'3/8-249.5258.8378.39731/4-482.55078.42575.6767/16-1411.1129.9349.14931/2-488.90084.77582.0267/16-2011.11210.2879.73833/4-495.25091.12588.376‘1/2-1312.711.4310.584'4-4101.60097.47594.726‘1/2-2012.711.87411.326UNEF螺牙基本尺寸代號(hào)螺紋牙數(shù)標(biāo)準(zhǔn)徑大徑小徑1/4325.65.695.4865/16327.17.2647.0873/8328.78.8658.6617/162810.210.33810.1351/22811.811.93811.7099/162413.213.38613.1325/82414.814.98614.7323/42017.817.95817.6787/8202121.13320.8531202424.30824.0285.5.3NPT、G螺紋基本尺寸NPT螺紋基本尺寸G(PF)螺紋基本尺寸NPT螺紋基本尺寸代號(hào)螺紋牙數(shù)大徑代號(hào)螺紋牙數(shù)大徑中徑小徑代號(hào)螺紋牙數(shù)大徑中徑小徑‘1/16277.8957.1426.389‘1/16287.7237.1426.5611/82710.2429.4898.7361/8289.7289.1478.5661/41813.61612.48711.3581/41913.15712.30111.4453/81817.05515.92614.7973/81916.66215.80614.951/21421.22319.77218.3211/21420.95519.79318.6313/41426.56825.11723.6665/81422.91121.74920.587111.533.22831.46129.6943/41426.44125.27924.11711/411.541.98540.21838.4517/81430.20129.03927.87711/211.548.05446.28744.5211133.24931.7730.291211.560.09258.32556.55811/81137.89736.41834.93921/2872.69970.15967.61911/41141.9140.43138.9523888.60886.06883.52811/21147.80346.32444.85431/28101.31698.77696.23613/41153.74652.26750.78848113.973111.433108.89321159.61458.13556.65658140.952138.412135.87221/41165.7164.23162.75268167.792165.252162.71221/21175.18473.70572.22688218.441215.901213.36123/41181.53480.05578.576108272.312269.772267.23231187.88486.40584.926128323.032320.492317.95231/211100.3398.85197.3725.5.4RP螺紋基本尺寸RP螺紋基本尺寸代號(hào)螺紋牙數(shù)大徑中徑小徑‘1/16287.7237.1426.5611/8289.7289.1478.5661/41913.15712.30111.4453/81916.66215.80614.951/21420.95519.79318.6313/41426.44125.27924.11711133.24931.7730.29111/41141.9140.43138.95211/21147.80346.32444.84521159.61458.13556.65621/21175.18473.70572.22631187.88486.40584.9262.6擠牙絲攻攻牙底孔徑公制螺紋（非圓絲攻）美制螺紋（非E圓絲攻）螺紋標(biāo)準(zhǔn)2級(jí)螺紋用下孔徑螺紋標(biāo)準(zhǔn)2級(jí)螺紋用下孔徑

準(zhǔn)鋁合金牌號(hào)化學(xué)成分（％）SiFeCuMnMgZnNiSnAlADC129.6-12.0W1.31.53.5W0.5W0.3W1W0.5W0.2余量ADC6W1.0W0.6W0.100.40.62.64.0W0.4W0.1W0.1余量A41311.013.0W1.3W1W0.35W0.1w0.05W0.5w0.15余量A3807.5-9.5W1.33.04.0W0.5W0.1W3W0.5w0.35余量精度最大-最小（咬合率）M1.75*0.35RH41.54-1.58(100-75%)M2*0.4RH41.81-1.85精度最大-最?。ㄒШ下剩㎝1.75*0.35RH41.54-1.58(100-75%)M2*0.4RH41.81-1.85(100-75%)M2.3*0.4RH42.11-2.15(100-75%)M2.5*0.45RH42.28-2.33(100-75%)M2.6*0.45RH42.38-2.43(100-75%)M3*0.5M3.5*0.6RH52.76-2.81(100-75%)RH53.20-3.26(100-75%)M4*0.7RH63.65-3.70(100-85%)M5*0.8M6*lRH64.95-4.66(100-85%)RH75.48-5.57(100-85%)3.鋁合金3.1鋁合金成分NO.2-56UNC-64UNFRH41.96-2.02(100-65%)RH31.98-2.04(100-65%)NO.3-48UNC-56UNFRH42.25-2.32(100-65%)RH42.29-2.357(100-65%)NO.4-40UNC-48UNFRH52.52-2.60(100-70%)RH42.57-2.64(100-70%)NO.5-40UNC-44UNFRH52.86-2.93(100-70%)RH42.88-2.95(100-70%)NO.6-32UNC-40UNFRH53.09-3.17(100-70%)RH53.19-3.26(100-70%)NO.8-32UNC-36UNFRH63.76-3.84(100-75%)RH53.80-3.88(100-75%)NO.10-24UNC-32UNFRH64.26-4.35(100-80%)RH54.41-4.48(100-80%)NO.12-24UNC-28UNFRH64.92-5.01(100-80%)RH55.00-5.08(100-80%)1/4-20UNC-28UNFRH65.66-5.76(100-80%)RH55.86-5.93(100-80%)最大-最?。ㄒШ下剩?.公差制造零件時(shí)，為了使零件具有互換性，要求零件的尺寸在一個(gè)合理范圍之內(nèi)，由此就規(guī)定了極限尺寸。制成后的實(shí)際尺寸，應(yīng)在規(guī)定的最大極限尺寸和最小極限尺寸范圍內(nèi)。允許尺寸的變動(dòng)量稱(chēng)為尺寸公差，簡(jiǎn)稱(chēng)公差。標(biāo)準(zhǔn)公差：標(biāo)準(zhǔn)公差I(lǐng)T的數(shù)值由基本是標(biāo)準(zhǔn)所列的用以確認(rèn)公差帶大小的任一公差。標(biāo)準(zhǔn)公差分為20個(gè)等級(jí)，即：IT01、IT02、IT1至IT18。IT表示標(biāo)準(zhǔn)公差，數(shù)字表示公差等級(jí)。IT01公差數(shù)值最小，精度最高；IT18公差數(shù)值最大，精度最低?；境叽纾涸O(shè)計(jì)給定的尺寸。極限尺寸：允許尺寸變動(dòng)的兩個(gè)極限值，它是以基本尺寸為基數(shù)來(lái)確定的。偏差：某一實(shí)際尺寸減其基本尺寸所得的代數(shù)差。極限偏差：即指上偏差和下偏差。最大極限尺寸減其基本尺寸所得的代數(shù)差就是上偏差；最小極限尺寸減其基本尺寸所得的代數(shù)差就是下偏差。尺寸公差：允許尺寸的變動(dòng)量。即最大極限尺寸與最小極限尺寸之差；也等于上偏差和下偏差代數(shù)差的絕對(duì)值。4.1ISOISO2768-1(GB/T1804-92)表1線性尺寸的極限偏差數(shù)值公差Limitsinmmfornominalsizesinmm符號(hào)描述0.5-33?66~3030~120120~40040010001000~20002000~4000ffine±.05±.05±.1±.15±.2±.3±.5—mmedium±.1±.1±.2±.3±.5±.8±.2±ccoarse±.2±.3±.5±.8±.2±±vverycoarse—±.5±.5±.5±±±Fornominalsizesbelow0,5mmthelimitmeasuresaretobeindicateddirectlyatthenominalmeasure.表2倒角半徑與倒角高度尺寸的極限偏差數(shù)值公差Limitsinmmfornominalsizesi