螺纹基本尺寸对照表

---..可修编.英制管螺纹基本尺寸及公差（牙形角55º）BSPP螺纹代号基本直径内螺纹外螺纹大径中径小径中径公差小径公差A级B级中径公差大径公差中径公差大径公差G1/8″×289.7289.1478.566+0.170+0.28200-0.1070-0.2140-0.2140-0.214G1/4″×1913.15712.30111.445+0.125+0.445-0.125-0.250-0.2500-0.250G3/8″×1916.66215.80614.950+0.1250+0.44500-0.1250-0.2500-0.2500-0.250G1/2″×1420.95519.79318.631+0.1420+0.54100-0.1420-0.2840-0.2840-0.284G5/8″×1422.91121.74920.587+0.1420+0.54100-0.1420-0.2840-0.2840-0.284G3/4″×1426.44125.27924.117+0.1420+0.54100-0.1420-0.2840-0.2840-0.284G1″×1133.24931.77030.291+0.1800+0.64000-0.1800-0.3600-0.3600-0.360G1.1/4″×1141.91040.43138.952+0.1800+0.64000-0.1800-0.3600-0.3600-0.360G1.1/2″×1147.80346.32444.854+0.1800+0.64000-0.1800-0.3600-0.3600-0.360G2″×1159.61458.13556.656+0.1800+0.64000-0.1800-0.3600-0.3600-0.360G2.1/2”X1175.18473.70572.226+0.2170+0.64000-0.2170-0.4340-0.4340-0.434G3”X1187.88486.40584.926+0.2170+0.64000-0.2170-0.4340-0.4340-0.434G3.1/2”X11100.33098.85197.372+0.2170+0.64000-0.2170-0.4340-0.4340-0.434英制锥管螺纹基本尺寸及公差（牙形角55º）BSPT螺纹代号基面上的直径基准长度有效螺纹长度圆锥内螺纹基面轴向位移偏差（±mm）大径中径小径基本最大最小基本最大最小R1/8″×289.7289.1478.5664.04.93.16.57.45.61.1R1/4″×1913.15712.30111.4456.07.34.79.711.08.41.7R3/8″×1916.66215.80614.9506.47.75.110.111.48.81.7R1/2″×1420.95519.79318.6318.210.06.413.215.011.42.3R3/4″×1426.44125.27924.1179.511.37.714.516.312.72.3R1″×1133.24931.77030.29110.412.78.116.819.114.52.9R1.1/4″×1141.91040.43138.95212.715.010.419.121.416.82.9R1.1/2″×1147.80346.32444.84512.715.010.419.121.416.82.9R2″×1159.61458.13556.65615.918.213.623.425.721.12.9R2.1/2”X1175.18473.70572.22617.521.014.026.730.223.23.5R3”X1187.88486.40584.92620.624.117.129.833.326.33.5R3.1/2”X11100.33098.85197.37222.225.718.731.434.927.93.5美制管螺纹基本尺寸及公差（牙形角60º）UN(F)螺纹代号外螺纹内螺纹公差等级公差等级2A2B大径中径小径小径中径大径最大最小最大最小最小最大最小最大JIC螺纹7/16″×20UNF11.07910.87410.25410.1479.5689.72810.03310.28710.42411.1131/2″×20UNF12.66712.46111.84111.73211.15611.32811.60811.87512.01712.79/16″×18UNF14.25214.03113.33513.22112.57312.75113.08113.37113.5214.2883/4″×16UNF19.01218.77317.98117.85417.1217.32317.67818.01918.18419.057/8″×14UNF22.18421.92321.00620.86920.02520.26920.67621.04621.22422.2251-1/16″×12UN26.94426.65525.5725.42524.42524.68925.14625.61325.80126.9881-5/16″×12UN33.29433.00531.9231.77330.77531.03931.49631.96332.15433.3381-5/8″×12UN41.22940.9439.88539.70538.7138.98939.44639.90140.09441.2751-7/8″×12UN47.57947.2946.20546.05345.0645.33945.79646.25146.44947.6252-1/2″×12UN63.45263.16262.07861.9260.93261.21461.67162.12662.33263.5ORFS螺纹9/16″×18UNF14.25214.03113.33513.22112.57312.75113.08113.37113.5214.28811/16″×16UN17.42717.18816.39616.27415.53515.74816.10416.43116.58917.46313/16″×16UN20.59920.36119.56819.44418.70718.92319.27919.60619.76620.6381″×14UNF25.35725.09524.17824.03623.19523.44423.82524.22124.40725.41-3/16″×12UN30.11929.8328.74528.59827.627.86428.32128.78828.97930.1631-7/16″×12UN36.46736.17735.09334.94333.94734.21434.67135.13835.33136.5131-11/16″×12UN42.81742.52741.44341.2940.29740.56441.02141.48841.68642.8632″×12UN50.75450.46549.3849.22548.23548.51448.97149.42649.62750.8SAE螺纹5/8″×18UNF15.83915.61814.92314.80314.16114.35114.68114.95815.1115.8751-1/16″×14UN26.94726.68325.74325.60824.7424.96825.37525.78325.96126.987其它美制螺纹9/16″×16UN14.25214.01313.22113.10112.3612.57312.92913.25613.41114.2887/8″×12UN22.18221.89220.80820.66819.66219.93920.39620.85121.03422.2252-1/4″×12UN57.10456.81555.7355.57554.58554.86455.32155.77655.97657.15注：UNC粗牙螺纹系列，UNF细牙螺纹系列，UNEF超细牙螺纹系列，UN不变螺距系列布锥管螺纹基本尺寸及公差(牙形角60º)NPT螺纹代号基面上的直径螺纹长度大径中径小径有效长度管端至基面长Z1/8″×2710.2729.5198.76674.572Z1/4″×1813.57212.44311.3149.55.080Z3/8″×1817.05515.92614.79710.56.096Z1/2″×1421.22319.77218.32113.58.028Z3/4″×1426.56825.11723.666148.611Z1″×11.533.22831.46129.69417.510.160Z1.1/4″×11.541.98540.21838.4511810.688Z1.1/2″×11.548.05446.28744.52018.510.688Z2″×11.560.09258.32556.5581911.074公制螺纹基本尺寸及公差(牙形角60º)M螺纹代号基本直径螺纹外螺纹大径中径小径公差等级公差等级6H7H6g中径公差小径公差中径公差小径公差中径公差大径公差M10X1109.3508.917+0.1500+0.2360+0.1900+0.3000-0.026-0.138-0.026-0.206M12X11211.35010.917+0.1600+0.2360+0.2000+0.3000-0.026-0.144-0.026-0.206M14X11413.35012.917+0.1600+0.2360+0.2000+0.3000-0.026-0.144-0.026-0.206M12X1.251211.18810.647+0.1800+0.2650+0.2240+0.3350-0.028-0.160-0.028-0.240M14X1.251413.18812.647+0.1800+0.2650+0.2240+0.3350-0.028-0.160-0.028-0.240M12X1.51211.02610.376+0.1900+0.3000+0.2360+0.3750-0.032-0.172-0.032-0.268M14X1.51413.02612.376+0.1900+0.3000+0.2360+0.3750-0.032-0.172-0.032-0.268M16X1.51615.02614.376+0.1900+0.3000+0.2360+0.3750-0.032-0.172-0.032-0.268M18X1.51817.02616.373+0.1900+0.3000+0.2360+0.3750-0.032-0.172-0.032-0.268M20X1.52019.02618.376+0.1900+0.3000+0.2360+0.3750-0.032-0.172-0.032-0.268M22X1.52221.02620.376+0.1900+0.3000+0.2360+0.3750-0.032-0.172-0.032-0.268M24X1.52423.02622.376+0.2000+0.3000+0.2500+0.3750-0.032-0.182-0.032-0.268M26X1.52625.02624.376+0.2000+0.3000+0.2500+0.3750-0.032-0.182-0.032-0.268M27X1.52726.02625.376+0.2000+0.3000+0.2500+0.3750-0.032-0.182-0.032-0.268M30X1.53029.02628.376+0.2000+0.3000+0.2500+0.3750-0.032-0.182-0.032-0.268M33X1.53332.02631.376+0.2000+0.3000+0.2500+0.3750-0.032-0.182-0.032-0.268M36X1.53635.02634.376+0.2000+0.3000+0.2500+0.3750-0.032-0.182-0.032-0.268M39X1.53938.02637.376+0.2000+0.3000+0.2500+0.3750-0.032-0.182-0.032-0.268M42X1.54241.02640.376+0.2000+0.3000+0.2500+0.3750-0.032-0.182-0.032-0.268M27X22725.70124.835+0.2240+0.3750+0.2800+0.4750-0.038-0.208-0.038-0.318M30X23028.70127.835+0.2240+0.3750+0.2800+0.4750-0.038-0.208-0.038-0.318M33X23331.70130.835+0.2240+0.3750+0.2800+0.4750-0.038-0.208-0.038-0.318M36X23634.70133.835+0.2240+0.3750+0.2800+0.4750-0.038-0.208-0.038-0.318M39X23937.70136.835+0.2240+0.3750+0.2800+0.4750-0.038-0.208-0.038-0.318M42X24240.70139.835+0.2240+0.3750+0.2800+0.4750-0.038-0.208-0.038-0.318M45X24543.70142.835+0.2240+0.3750+0.2800+0.4750-0.038-0.208-0.038-0.318M52X25250.70149.835+0.2360+0.3750+0.3000+0.4750-0.038-0.218-0.038-0.318M60X26058.70157.835+0.2360+0.3750+0.3000+0.4750-0.038-0.218-0.038-0.318M64X26462.70161.835+0.2360+0.3750+0.3000+0.4750-0.038-0.218-0.038-0.318M72X27270.70169.835+0.2360+0.3750+0.3000+0.4750-0.038-0.218-0.038-0.31855°圆锥管螺纹基本尺寸对照最新下载-汇兴达55°圆锥管螺纹基本尺寸对照表最新下载-汇兴达55°圆锥管螺纹(BSPT) 螺纹代号基本尺寸英寸大径mmd=D螺距mmp每英寸牙数tpi中径mmd2=D2小径外螺纹d3牙型高度H1圆弧尺寸r底孔尺寸mmR1/161/16"7.7230.907287.1426.5610.5810.1256.4R1/81/8"9.7280.907289.1478.5660.5810.1258.4R1/41/4"13.1571.3371912.30111.4450.8560.18411.2R3/83/8"16.6621.3371915.80614.9500.8560.18414.75R1/21/2"20.9551.8141419.79318.6311.1620.24918.25R3/43/4"26.4411.8141425.27924.1171.1620.24923.75R11"33.2492.3091131.7730.2911.4790.31730R11/411/4"41.9102.3091140.43138.9521.4790.31738.5R11/211/2"47.8032.3091146.32444.8451.4790.31744.5R22"59.6142.3091158.13556.6561.4790.31756R21/221/2"75.1842.3091173.70572.2261.4790.31771R33"87.8842.3091186.40584.9261.4790.31785.5R44"113.0302.30911111.551110.0721.4790.317110.5R55"138.4302.30911136.951135.4721.4790.317136R66"163.8302.30911162.351160.8721.4790.317161.5聊城市鑫茂祥管业XX专业经营钢管规格：5mm*1mm—1020mm*200mm合金钢管、外径22mm-127mm冷轧无缝钢管、外径127mm-600mm，壁厚16mm-100mm，外径精度±0.5%,壁厚精度±5%热轧中厚壁无缝钢管、16Mn外径400—1600mm、壁厚20—60mm的大口径厚壁卷管，可定尺到16米及各种规格的无缝方管、异型无缝钢管等.常备钢管种类有:构造用无缝钢管、流体用无缝钢管、液压无缝钢管、电力用无缝钢管、石油输送用无缝钢管、化肥设备用无缝钢管、煤矿用无缝钢管、不锈钢无缝钢管、化工用无缝钢管、纺织机械用无缝钢管、汽车；水利用无缝钢管，精密无缝钢管、光亮无缝钢管、军工医疗用无缝钢管、管道用无缝钢管、支柱用无缝钢管、合金无缝管、高压无缝管、大口径直缝焊管等。适用于工程、煤矿、纺织、电力、锅炉、机械、军工等各个领域。公司以良好的信用、优质的产品、雄厚的实力、低廉的价钱享誉全国30多个省、市、自治区、直辖市及国外，产品深得用户依赖。   公司常年销售XX钢铁集团、冶钢集团、XX钢厂、宝钢集团、鞍钢集团、XX大无缝、XX特钢厂、XX钢厂、XX钢厂等各大钢厂生产的各种无缝钢管及合金管。主营材质：20#、35#、45#、20G、20A、40Mn2、45Mn2、27SiMn、40MnB、20MnVB、20Cr、30Cr、35Cr、40Cr、45Cr、50Cr、38CrSi、12CrMo、20CrMo、35CrMo、42CrMo、12CrMoV、12Cr1MoV、38CrMoAL、50CrV、20CrMnSi、30CrMnSi、35CrMnSi、20CrMnTi、30CrMnTi、12CrNi2、12CrNi3、12Cr2Ni4、40CrNiMoA、45CrNiMoVA、20G、20MnG、25MnG、12CrMoG、15CrMoG、12Cr2MoG、12Cr1MoVG、12Cr2MoWVTiB、12Cr3MoVSiTiB等实行标准：GB/T8162-99构造管、GB/T8163-99流体管、GB/T3087-99中低压锅炉管、GB/T5310-95高压锅炉管、GB/T6479-2000化肥专用管、27SiMn液压支架管、高压合金管、GB/T9948-85石油裂化管GB9948-88、地质钻探用管YB235-70、汽车半轴套管YB/T5035-96。   现我公司有大量合金管、高压管、无缝方管、异型无缝钢管现货，将以优惠的价钱，批零兼营的方式，为您提供快捷优质的服务，欢迎新老客户前来洽谈、电议。管螺纹的基本尺寸表(2010-10-2515:57:35)HYPERLINK"javascript:;"▼标签：HYPERLINK"uni.sina../c.php?t=blog&k=%D4%D3%CC%B8&ts=bpost&stype=tag"\t"_blank"杂谈表（1）螺纹基本尺寸     G1/2 、ZG1/2                    (单位:mm) 尺寸代号每25.4mm类的牙数n螺距p牙型高度h圆弧半径r≈基面上的基本直径基准距离有效螺纹长度大径（基准直径）d=D中径d2=D2小径d1=D11/16280.9070.5810.1257.7237.1426.5614.06.51/8280.9070.5810.1259.7289.1478.5664.06.51/4191.3370.5860.18413.15712.30111.4456.09.73/8191.3370.5860.18416.66215.80614.9506.410.11/2141.8141.1620.24920.95519.79318.6318.213.23/4141.8141.1620.24926.44125.27924.1179.514.51112.3091.4790.31733.24931.77030.29110.416.81.1/4112.3091.4790.31741.91040.43138.95212.719.11.1/2112.3091.4790.31747.80346.32444.84512.719.12112.3091.4790.31759.61458.13556.65615.923.42.1/2112.3091.4790.31775.18473.70572.22617.526.73112.3091.4790.31787.88486.40584.92620.629.83.1/2112.3091.4790.317100.33098.85197.37222.231.44112.3091.4790.317113.030111.551110.07225.435.85112.3091.4790.317138.430136.951135.47228.640.16112.3091.4790.317163.830162.351160.87228.640.1 锥管螺纹的基本尺寸表（3-28）1/2PT 、1/2NPT 表（2）螺纹基本尺寸      (单位:mm) 尺寸代号每25.4mm类的牙数n基面上的基本直径基准距离大径（基准直径）d=D中径d2=D2小径d1=D11/16277.8957.1426.3894.0641/82710.2429.4898.7364.1021/41813.61612.48711.3585.7863/81817.05515.92614.7976.0961/21421.22319.77218.3218.1283/41426.56825.11723.6668.611111.533.22831.46129.69410.1601.1/411.541.98540.21838.45110.6681.1/211.548.05446.28744.52010.668211.560.09258.32556.55811.0742.1/2872.69970.15967.61917.3233888.60886.06883.52819.4563.1/28101.31698.77696.23620.85348113.973111.433108.89321.438螺纹标准的一种，按外形分圆柱、圆锥两种；按牙型角分55°、60°两种。螺纹中的1/4、1/2、1/8 标记是指螺纹尺寸的直径，单位是英寸。一吋等于8分，1/4 吋就是2分，如此类推。　　国外常用英制螺纹的代号、名称和标准号 ：　　B.S.W. 标准惠氏粗牙系列，一般用途圆柱螺纹 B.S.F. 标准惠氏细牙系列，一般用途圆柱螺纹 　　Whit.S 附加的惠氏可选择系列，一般用途圆柱螺纹 　　Whit 惠氏牙型的非标准螺纹 　　以上为英国标准BS84 牙型角为55°的英制螺纹 　　UN 恒定螺距系列的统一螺纹 　　UNC 粗牙系列的统一螺纹 　　UNF 细牙系列的统一螺纹 　　UNEF 超细牙系列的统一螺纹 　　UNS① 特殊系列的统一螺纹 　　UNR 圆弧牙底恒定螺距系列的统一螺纹 　　UNRC 圆弧牙底粗牙系列统一螺纹 　　UNRF 圆弧牙底细牙系列统一螺纹 　　UNREF 圆弧牙底超细牙系列统一螺纹 　　UNRS 圆弧牙底特殊系列统一螺纹 　　以上为美国标准ANSIB1.1标准牙型(牙底是平的或随意倒圆的)的内、外螺纹 圆弧牙底的UNR、UNRC、UNRF、UNREF、NRS只用于外螺纹而没有内螺纹 　　NPT② 一般用途的锥管螺纹 　　NPSC 管接头用直管螺纹 　　NPTR 导杆连接用锥管螺纹 　　NPSM 机械连接用直管螺纹 　　NPSL 锁紧螺母用直管螺纹 　　NPSH 软管连接用直管螺纹 　　以上为美国标准ANSIB1.20.1 牙型角为60°的英制管螺纹　　NPTF 干密封标准型锥管螺纹 美国标准ANSIB1.20.3 Ⅰ型 　　PTF-SAE SHORT 干密封短型锥管螺纹 美国标准ANSIB1.20.3 Ⅱ型 　　NPSF 干密封标准型燃油用直管内螺纹 美国标准ANSIB1.20.3 Ⅲ型 　　NPS1 干密封标准型一般用直管内螺纹 美国标准ANSIB1.20.3 Ⅳ型 　　ACME③ 一般用途的梯形螺纹 美国标准ANSIB1.5 牙型角为29°的英制传动螺纹 　　①尺寸和公差使用与标准系列相同的公式计算的标准系列之外的所有直径与螺距组合。 　　②我国的60°圆锥管螺纹GB/T12716-1991与之等效。 　　③ACME螺纹包括一般用途的和定心的两种配合的梯形螺纹，其中一般用途者与我国标准GB/T5796-1986规定的梯形螺纹的性能相类同。　　螺距用每英寸的牙数来表示，如：每英寸11牙，则螺距＝25.4/11＝2.309mm  螺纹如何区分英制和公制？默认分类 2009-08-24 22:03:14 阅读1281 评论0 字号：大中小 粗略判断的话好像英制的比公职的牙距大（同规格的） NPT，PT，G　都是管螺纹．NPT 是 National (American) Pipe Thread 的縮寫，屬於美国標准的 60 度锥管螺纹，用於北美地區．国家標准可查阅 GB/T12716-1991PT 是 Pipe Thread 的縮寫，是 55 度密封圓锥管螺纹，屬惠氏螺紋家族，多用於欧洲及英联邦国家．常用於水及煤气管行业，锥度規定为 1:16． 国家標准可查阅 GB/T7306-2000G 是 55 度非螺纹密封管螺纹，屬惠氏螺紋家族．标记为 G 代表圓柱螺紋．国家標准可查阅 GB/T7307-2001另外螺纹中的1/4、1/2、1/8 标记是指螺紋尺寸的直徑，單位是英吋．行內人通常用分來稱呼螺紋尺寸，一吋等於８分，1/4 吋就是２分，如此類推G 好像就是管螺纹的统称(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，老国标标注为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，显然螺纹大径比公称直径大。1/4，1/2，1/8是英制螺纹的公称直径，单位是英寸。英制螺纹标准规格表寸Ww牙型代号大径mmd=D螺距mmp每英寸牙数tpi中径mmd2=D2小径外螺纹d3牙型高H1底孔直径mm 1/16"BSW1.5870.423601.3151.0500.2701.15 3/32"BSW2.3810.529482.0411.7030.3381.90 1/8"BSW3.1750.635402.7682.3620.4062.50 5/32"BSW3.9690.793323.4592.9520.5073.20 3/16"BSW4.7621.058244.0843.4070.6773.70 7/32"BSW5.5561.058244.8784.2010.6774.50 1/4"BSW6.3501.270205.5374.7240.8135.10 5/16"BSW7.9381.411187.0346.1310.9046.50 3/8"BSW9.5251.588168.5097.4921.0177.90 7/16"BSW11.1131.814149.9518.7891.1629.20 1/2"BSW12.7002.1171211.3459.9901.35510.40 5/8"BSW15.8762.3091114.39712.9181.47913.40 3/4"BSW19.0512.5401017.42415.7981.62716.25 7/8"BSW22.2262.822920.41918.6111.80719.25 1"BSW25.4003.175823.36821.3352.03322.00 1 1/8"BSW28.5763.629726.25323.9292.32424.50 1 1/4"BSW31.7513.629729.42827.1042.32427.25 1 3/8"BSW34.9264.233632.21529.5052.71130.25 1 1/2"BSW38.1004.233635.39132.6802.71133.50 1 5/8"BSW41.2775.080538.02434.7713.25335.50 1 3/4"BSW44.4525.080541.19937.9463.25338.50 1 7/8"BSW47.6275.6454 1/244.01240.3983.61441.25 2"BSW50.8025.6454 1/247.18743.5733.61444.50 2 1/4"BSW57.1526.350453.08649.0204.06650.00 2 1/2"BSW63.5026.350459.43655.3704.06656.00 2 3/4"BSW69.8537.2573 1/265.20560.5584.64761.50 3"BSW76.2037.2573 1/271.55666.9094.64768.00 3 1/4"BSW82.5537.8163 1/477.54872.5445.00573.75 3 1/2"BSW88.9037.8163 1/483.89978.8945.00580.00 3 3/4"BSW95.2548.467389.83284.4105.42285.50 4"BSW101.6048.467396.18290.7605.42292.00 4 1/4"BSW107.9548.8352 7/8102.29796.6395.65798.00 4 1/2"BSW114.3048.8352 7/8108.647102.9905.657104.20 4 3/4"BSW120.6659.2372 3/4114.740108.6255.915110.00 5"BSW127.0059.2372 3/4121.090115.1765.915116.50 5 1/4"BSW133.3559.6772 5/8127.159120.9636.196122.50 5 1/2"BSW139.7059.6772 5/8133.509127.3136.196128.50 5 3/4"BSW146.05510.1602 1/2139.549133.0436.506134.50 6"BSW152.40610.1602 1/2145.900139.3946.506141.00            英制普通螺纹 -- 细牙 -- BSF英制普通螺纹 (惠氏螺纹) -- 细牙 (BSW)名义尺寸BSF牙型代号大径mmd=D螺距mmp每英寸牙数tpi中径mmd2=D2小径外螺纹d3牙型高H1底孔直径mm 3/16BSF4.7630.794324.2553.7470.5084.007/32BSF5.5560.907284.9754.3940.5814.601/4BSF6.3500.977265.7255.1000.6255.309/32BSF7.1420.977266.5185.8930.6256.105/16BSF7.9381.156227.1996.4590.7396.803/8BSF9.5251.27208.7127.8990.8138.307/16BSF11.1131.4111810.2099.3040.9049.701/2BSF12.7001.5881611.68410.6681.01711.109/16BSF14.2881.5881613.27212.2561.01712.705/8BSF15.8751.8141414.71213.5491.16214.0011/16BSF17.4631.8141416.30015.1371.16215.503/4BSF19.0502.1171217.69316.3361.35516.7513/16BSF20.6382.1171219.28117.9241.35518.257/8BSF22.2252.3091120.74719.2691.47919.751BSF25.4002.541023.77422.1481.62722.751 1/8BSF28.5752.822926.76924.9631.80726.501 1/4BSF31.7502.822929.94428.1381.80728.751 3/8BSF34.9253.175832.89330.8612.03331.501 1/2BSF38.1003.175836.06834.0362.03334.501 5/8BSF41.2753.175839.24337.2112.03338.001 3/4BSF44.4503.629742.12639.8022.32440.502BSF50.8003.629748.47646.1522.32447.002 1/4BSF57.1504.234654.44051.7302.71153.002 1/2BSF63.5004.234660.79058.0802.71159.002 3/4BSF69.8504.234667.14064.4302.711-3BSF76.2005.08572.94669.6923.253-3 1/4BSF82.5505.08579.29676.0423.253-3 1/2BSF88.9005.6454 1/285.28581.6703.614-3 3/4BSF95.2505.6454 1/291.63588.0203.614-4BSF101.6005.6454 1/297.98594.3703.614-4 1/4BSF107.9506.354103.88699.8224.066-螺纹标记的标注 当螺纹精度要求较高时，除标注螺纹代号外，还应标注螺纹公差带代号和螺纹旋合长度。 螺纹标记的标注格式为： 螺纹代号—螺纹公差带代号(中径、顶径)—旋合长度 有关标注内容的说明： 1) 公差带代号由数字加字母表示(内螺纹用大写字母，外螺纹用小写字母)，如7H、6g等，应特别指出，7H，6g等代表螺纹公差，而H7，g6代表圆柱体公差代号。 2) 旋合长度规定为短(用S表示)、中(用N表示)、长(用L表示)三种。一般情况下，不标注螺纹旋合长度，其螺纹公差带按中等旋合长度(N)确定。必要时，可加注旋合长度代号S或L，如“M20-5g6g－L”。特殊需要时，可注明旋合长度的数值，如“M20-5g6g－30”。 相关 HYPERLINK"bbs.bzjw./business.asp?id_x=13426"\t"_blank"美英制螺纹用英制单位 HYPERLINK"bbs.bzjw./technic.asp?id_x=10854"\t"_blank"螺纹标准,螺纹标准手册HYPERLINK"bbs.bzjw./busifri.asp?id_x=13431"\t"_blank" 螺纹的结构 HYPERLINK"bbs.bzjw./technic.asp?id_x=10457"\t"_blank"英制螺纹尺寸,英制螺纹尺寸表 HYPERLINK"bbs.bzjw./technic.asp?id_x=10463"\t"_blank"英制螺纹规格,英制螺纹规格表 HYPERLINK"bbs.bzjw./technic.asp?id_x=13523"\t"_blank"英制管螺纹（55°） HYPERLINK"bbs.bzjw./technic.asp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