螺紋基本尺寸對照表

1、標(biāo)準(zhǔn)實(shí)用英制管螺紋基本尺寸及公差（牙形角 55o ） BSPP螺紋代號基本直徑內(nèi)螺紋外螺紋大徑中徑小徑中徑公差小徑公差A(yù)級B級中徑公差大徑公差中徑公差大徑公差G1/8 X 289.7289.1478.566+0.170+0.28200-0.1070-0.2140-0.2140-0.214G1/4” X 1913.15712.30111.445+0.125+0.445-0.125-0.250-0.2500-0.250G3/8” X 1916.66215.80614.950+0.1250+0.44500-0.1250-0.2500-0.2500-0.250G1/2” X 1420.95519.79

2、318.631+0.1420+0.54100-0.1420-0.2840-0.2840-0.284G5/8 X 1422.91121.74920.587+0.1420+0.54100-0.1420-0.2840-0.2840-0.284G3/4 X 1426.44125.27924.117+0.1420+0.54100-0.1420-0.2840-0.2840-0.284G1 X 1133.24931.77030.291+0.1800+0.64000-0.1800-0.3600-0.3600-0.360G1.1/4 X 1141.91040.43138.952+0.1800+0.64000-0

3、.1800-0.3600-0.3600-0.360G1.1/2 X 1147.80346.32444.854+0.1800+0.64000-0.1800-0.3600-0.3600-0.360G2 X 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+0.64000-0.2170-0.4340-0.4340-0.434

4、G3.1/2” X11100.33098.85197.372+0.2170+0.64000-0.2170-0.4340-0.4340-0.434英制錐管螺紋基本尺寸及公差（牙形角 55o ） BSPT螺紋代號基面上的直徑基準(zhǔn)長度有效螺紋長度圓錐內(nèi)螺紋基面軸向 位移偏差（ mm大徑中徑小徑基本最大最小基本最大最小R1/8 X 289.7289.1478.5664.0R1/4 X 1913.15712.30111.4456.011.08.41.7R3/8 X 1916.66215.80614.9501.7

5、R1/2” X 1420.95519.79318.6318.210.06.413.215.011.42.3R3/4 X 1426.44125.27924.1179.511.37.714.516.312.72.3R1 X 1133.24931.77030.29110.4R1.1/4 X 1141.91040.43138.95212.715.010.419.121.416.82.9R1.1/2 X 1147.80346.32444.84512.715.010.419.121.416.82.9R2 X 1159.61458.13556.65615.918.

6、213.623.425.721.12.9R2.1/2 ” X1175.18473.70572.22617.521.014.026.7R3 X1187.88486.40584.92620.633.326.33.5R3.1/2 ” X11100.33098.85197.37222.225.718.731.434.927.93.5美制管螺紋基本尺寸及公差（牙形角 60o ） UN（F）螺紋代號外螺紋內(nèi)螺紋公差等級公差等級2A2B大徑中徑小徑小徑中徑大徑最大最小最大最小最小最大最小最大JIC螺紋7/16 X 20UNF11.07910.87410.2541

7、0.1479.5689.72810.03310.28710.42411.1131/2 X 20UNF12.66712.46111.84111.73211.15611.32811.60811.87512.01712.79/16 X 18UNF14.25214.03113.33513.22112.57312.75113.08113.37113.5214.2883/4 X 16UNF19.01218.77317.98117.85417.1217.32317.67818.01918.18419.057/8 X 14UNF22.18421.92321.00620.86920.02520.26920.67

8、621.04621.22422.2251-1/16 X 12UN26.94426.65525.5725.42524.42524.68925.14625.61325.80126.9881-5/16 X 12UN33.29433.00531.9231.77330.77531.03931.49631.96332.15433.3381-5/8 X 12UN41.22940.9439.88539.70538.7138.98939.44639.90140.09441.2751-7/8 X 12UN47.57947.2946.20546.05345.0645.33945.79646.25146.44947.

9、6252-1/2 X 12UN63.45263.16262.07861.9260.93261.21461.67162.12662.33263.5ORFSg 紋9/16 X 18UNF14.25214.03113.33513.22112.57312.75113.08113.37113.5214.28811/16 X 16UN17.42717.18816.39616.27415.53515.74816.10416.43116.58917.46313/16 X 16UN20.59920.36119.56819.44418.70718.92319.27919.60619.76620.6381 X 14

10、UNF25.35725.09524.17824.03623.19523.44423.82524.22124.40725.41-3/16 X 12UN30.11929.8328.74528.59827.627.86428.32128.78828.97930.1631-7/16 X 12UN36.46736.17735.09334.94333.94734.21434.67135.13835.33136.5131-11/16 X 12UN42.81742.52741.44341.2940.29740.56441.02141.48841.68642.8632 X 12UN50.75450.46549.

11、3849.22548.23548.51448.97149.42649.62750.8SAEW 紋5/8 X 18UNF15.83915.61814.92314.80314.16114.35114.68114.95815.1115.8751-1/16 X 14UN26.94726.68325.74325.60824.7424.96825.37525.78325.96126.987其它美制螺紋9/16 X 16UN14.25214.01313.22113.10112.3612.57312.92913.25613.41114.2887/8 X 12UN22.18221.89220.80820.668

12、19.66219.93920.39620.85121.03422.2252-1/4 X 12UN57.10456.81555.7355.57554.58554.86455.32155.77655.97657.15注：UNO牙螺紋系列，UNF細(xì)牙螺紋系列，UNEF超細(xì)牙螺紋系列， UN不變螺距系列布錐管螺紋基本尺寸及公差（牙形角60o ） NPT螺紋代號基面上的直徑螺紋長度大徑中徑小徑有效長度管端至基面長Z1/8 X 2710.2729.5198.76674.572Z1/4 ” X 1813.57212.44311.3149.55.080Z3/8 X 1817.05515.92614.79710

13、.56.096Z1/2 ” X 1421.22319.77218.32113.58.028Z3/4 X 1426.56825.11723.666148.611Z1 X 11.533.22831.46129.69417.510.160Z1.1/4 X 11.541.98540.21838.4511810.688Z1.1/2 X 11.548.05446.28744.52018.510.688Z2 X 11.560.09258.32556.5581911.074公制螺紋基本尺寸及公差（牙形角60o ） M螺紋代號基本直徑內(nèi)螺紋外螺紋大徑中徑小徑公差等級公差等級6H7H6g中徑公差小徑公差中徑公差小

14、徑公差中徑公差大徑公差M10X1109.3508.917+0.150+0.236+0.190+0.300-0.026-0.0260000-0.138-0.206M12X11211.35010.917+0.160+0.236+0.200+0.300-0.026-0.0260000-0.144-0.206M14X11413.35012.917+0.160+0.236+0.200+0.300-0.026-0.0260000-0.144-0.206M12X1.251211.18810.647+0.180+0.265+0.224+0.335-0.028-0.0280000-0.160-0.240M14X

15、1.251413.18812.647+0.180+0.265+0.224+0.335-0.028-0.0280000-0.160-0.240M12X1.51211.02610.376+0.190+0.300+0.236+0.375-0.032-0.0320000-0.172-0.268M14X1.51413.02612.376+0.190+0.300+0.236+0.375-0.032-0.0320000-0.172-0.268M16X1.51615.02614.376+0.190+0.300+0.236+0.375-0.032-0.0320000-0.172-0.268M18X1.51817

16、.02616.373+0.190+0.300+0.236+0.375-0.032-0.0320000-0.172-0.268M20X1.52019.02618.376+0.190+0.300+0.236+0.375-0.032-0.0320000-0.172-0.268M22X1.52221.02620.376+0.190+0.300+0.236+0.375-0.032-0.0320000-0.172-0.268M24X1.52423.02622.376+0.200+0.300+0.250+0.375-0.032-0.0320000-0.182-0.268M26X1.52625.02624.3

17、76+0.200+0.300+0.250+0.375-0.032-0.0320000-0.182-0.268M27X1.52726.02625.376+0.200+0.300+0.250+0.375-0.032-0.0320000-0.182-0.268M30X1.53029.02628.376+0.200+0.300+0.250+0.375-0.032-0.0320000-0.182-0.268M33X1.53332.02631.376+0.200+0.300+0.250+0.375-0.032-0.0320000-0.182-0.268M36X1.53635.02634.376+0.200

18、+0.300+0.250+0.375-0.032-0.0320000-0.182-0.268M39X1.53938.02637.376+0.200+0.300+0.250+0.375-0.032-0.0320000-0.182-0.268M42X1.54241.02640.376+0.200+0.300+0.250+0.375-0.032-0.0320000-0.182-0.268M27X22725.70124.835+0.224+0.375+0.280+0.475-0.038-0.0380000-0.208-0.318M30X23028.70127.835+0.224+0.375+0.280

19、+0.475-0.038-0.0380000-0.208-0.318M33X23331.70130.835+0.224 0+0.375 0+0.280 0+0.475 0-0.038-0.208-0.038-0.318M36X23634.70133.835+0.224+0.375+0.280+0.475-0.038-0.0380000-0.208-0.318M39X23937.70136.835+0.224+0.375+0.280+0.475-0.038-0.0380000-0.208-0.318M42X24240.70139.835+0.224+0.375+0.280+0.475-0.038

20、-0.0380000-0.208-0.318M45X24543.70142.835+0.224 0+0.375 0+0.280 0+0.475 0-0.038-0.208-0.038-0.318M52X25250.70149.835+0.236+0.375+0.300+0.475-0.038-0.0380000-0.218-0.318M60X26058.70157.835+0.236+0.375+0.300+0.475-0.038-0.0380000-0.218-0.318M64X26462.70161.835+0.236+0.375+0.300+0.475-0.038-0.0380000-0

21、.218-0.318M72X27270.70169.835+0.236 0+0.375 0+0.300 0+0.475 0-0.038-0.218-0.038-0.31855 圓錐管螺紋基本尺寸對照表最新下載-匯興達(dá)55 圓錐管螺紋基本尺寸對照表最新下載-匯興達(dá)55圓錐管螺紋（BSPT）螺紋代號基本尺寸英寸大徑mmd=D螺距mmP每 英 寸 牙 數(shù) tpi中徑mmd2=D2小 徑 外 螺 紋 d3牙型高度H1R11/6./23072842560.581116R8.11/89.70.9289.1560.581/28074768R1111/413.1.31912.40.856

22、1433/816.1.31915.90.856/66237806508R1/220.1.81419.181.1621/295514793.631R2433/426.1.81425.11.162/4411427917430R133.2.31131.21.4791249097791R1141.2.340.3811/49100911431.91.479/524R1147.2.346.4411/28030911324.81.479/45256R259.2.31158.61.47926140913556R2275.2.373.7211/21840911705.21.479/26

23、284R387.2.31186.91.47938840940526R44113.0302.30911111.551110.0721.479R55138.4302.30911136.951135.4721.479R66163.8302.30911162.351160.8721.479聊城市鑫茂祥管業(yè)有限公司專業(yè)經(jīng)營鋼管規(guī)格：5mm*1mm 1020mm*200mm金鋼管、外徑 22mm-127mi#軋無縫鋼管、外徑127mm-600mm壁厚16mm-100mm外徑精度 0.5%,壁厚精度土 5哪軋中厚壁無縫鋼管、16Mn外徑4001600mm壁厚2060mm的大口徑厚壁卷管，可定尺到16米及各種

24、規(guī)格的無縫方管、異型無縫鋼管等.常備鋼管種類有：構(gòu)造用無縫鋼管、流體用無縫鋼管、液壓無縫鋼管、電力用無縫鋼管、石油輸送用無縫鋼管、化肥設(shè)備用無縫鋼管、煤礦用無縫鋼管、不銹鋼無縫 鋼管、化工用無縫鋼管、紡織機(jī)械用無縫鋼管、汽車；水利用無縫鋼管，精密無縫鋼管、光亮無縫鋼管、軍工醫(yī)療用無縫鋼 管、管道用無縫鋼管、支柱用無縫鋼管、合金無縫管、高壓無縫管、大口徑直縫焊管等。適用于工程、煤礦、紡織、電力、鍋爐、機(jī)械、軍工等各個(gè)領(lǐng)域。公司以良好的信用、優(yōu)質(zhì)的產(chǎn)品、雄厚的實(shí)力、低廉的價(jià)錢享譽(yù)全國30多個(gè)省、市、自治區(qū)、直轄市及國外，產(chǎn)品深得用戶依賴。公司常年銷售成都鋼鐵集團(tuán)、冶鋼集團(tuán)、包頭鋼廠、寶鋼集團(tuán)、鞍鋼

25、集團(tuán)、天津大無縫、西寧特鋼廠、無錫鋼廠、衡陽鋼廠等各大鋼廠生產(chǎn)的各種無縫鋼管及合金管。主營材質(zhì)：20#、35#、45#、20G 20A、40Mn2 45Mn2、27SiMn、40MnB20MnVB 20Cr、30Cr、35Cr、40Cr、45Cr、50Cr、38CrSi、12CrMo、20CrMa 35CrMa 42CrMa 12CrMoM 12Cr1MoV 38CrMoAL 50CrV、20CrMnSi、30CrMnSi、35CrMnSi、20CrMnTi、30CrMnTi、12CrNi2、12CrNi3、12Cr2Ni4、40CrNiMoA、45CrNiMoVA 20G、20MnG 25M

26、nG 12CrMoG 15CrMoG 12Cr2MoG 12Cr1MoVG 12Cr2MoWVTiB 12Cr3MoVSiTiB 等實(shí)行標(biāo)準(zhǔn)：GB/T8162-99 構(gòu)造管、GB/T8163-99流體管、GB/T3087-99中低壓鍋爐管、 GB/T5310-95高壓鍋爐管、 GB/T6479-2000化肥專用管、27SiMn 液壓支架管、高壓合金管、 GB/T9948-85石油裂化管 GB9948-88、地質(zhì)鉆探用管 YB235-70、汽車半軸套管 YB/T5035-96?，F(xiàn)我公司有大量合金管、高壓管、無縫方管、異型無縫鋼管現(xiàn)貨，將以優(yōu)惠的價(jià)錢，批零兼營的方式，為您提供快 捷優(yōu)質(zhì)的服務(wù)，歡迎

27、新老客戶前來洽談、電議。管螺紋的基本尺寸表(2010-10-25 15:57:35)轉(zhuǎn)載碼簽：雜談尺寸代 號每 25.4mm 類的牙 數(shù)n螺距p牙型高度h圓弧半 徑r =基面上的基本直徑基準(zhǔn) 距離后效 螺紋 長度大徑（基 準(zhǔn)直徑） d=D中徑d2=D2小徑d1=D11/161/8280.9070.581 0.1257.7237.1426.5614.06.5280.9070.581 0.1259.7289.1478.5664.06.51/4191.3370.586 0.18413.15712.30111.4456.09.7 J3/8191.3370.586 0.18416.66215.80614

28、.9506.410.11/2141.8141.162 0.24920.95519.79318.6318.213.23/4141.8141.162 0.24926.44125.27924.1179.514.511112.3091.479 0.31733.24931.77030.29110.416.81.1/4112.3091.479 0.31741.91040.43138.95212.719.1 11.1/22112.3091.479 0.31747.80346.32444.84512.719.1112.3091.479 0.31759.61458.13556.65615.923.42.1/21

29、12.3091.479 0.31775.18473.70572.22617.526.7 J3112.3091.479 0.31787.88486.40584.92620.629.83.1/2112.3091.479 0.317100.33098.85197.37222.231.44112.3091.479 0.317113.030111.551110.07225.435.85112.3091.479 0.317138.430136.951135.47228.640.16112.3091.479 0.317163.830162.351160.87228.640.1表（1）螺紋基本尺寸G1/2、Z

30、G1/2（單位:mm）錐管螺紋的基本尺寸表（3-28 ） 1/2PT、1/2NPT表（2）螺紋基本尺寸（單位:mm）尺寸代 號每25.4mm 類的牙 數(shù)n基面上的基本直徑基準(zhǔn)跑離大徑（基 準(zhǔn)直徑） d=D中徑d2=D2小徑d1=D11/161/8277.8957.1426.3894.0642710.2429.4898.7364.1021/41813.61612.48711.3585.7863/81817.05515.92614.7976.096 11/21421.22319.77218.3218.1283/411426.56825.11723.6668.61111.533.22831.4612

31、9.69410.1601.1/411.541.98540.21838.45110.6681.1/211.548.05446.28744.52010.668211.560.09258.32556.55811.0742.1/2872.69970.15967.61917.3233 888.60886.06883.52819.4563.1/28101.31698.77696.23620.85348113.973111.433108.89321.438螺紋標(biāo)準(zhǔn)的一種，按外形分圓柱、圓錐兩種；按牙型角分55、60兩種。螺紋中的1/4、1/2、1/8 標(biāo)記是指螺紋尺寸的直徑，單位是英寸。一口寸等于8分，1/

32、4 口寸就是2分，如此類推。國外常用英制螺紋的代號、名稱和標(biāo)準(zhǔn)號：B.S.W.標(biāo)準(zhǔn)惠氏粗牙系列，一般用途圓柱螺紋 B.S.F. 標(biāo)準(zhǔn)惠氏細(xì)牙系列，一般用途圓柱螺紋Whit.S 附加的惠氏可選擇系列,一般用途圓柱螺紋Whit惠氏牙型的非標(biāo)準(zhǔn)螺紋以上為英國標(biāo)準(zhǔn)BS84牙型角為55的英制螺紋UN恒定螺距系列的統(tǒng)一螺紋UNC粗牙系列的統(tǒng)一螺紋UNF細(xì)牙系列的統(tǒng)一螺紋UNEF超細(xì)牙系列的統(tǒng)一螺紋UN特殊系列的統(tǒng)一螺紋UNR圓弧牙底恒定螺距系列的統(tǒng)一螺紋UNRC圓弧牙底粗牙系列統(tǒng)一螺紋UNRF圓弧牙底細(xì)牙系列統(tǒng)一螺紋UNREF圓弧牙底超細(xì)牙系列統(tǒng)一螺紋UNRS圓弧牙底特殊系列統(tǒng)一螺紋以上為美國標(biāo)準(zhǔn)ANSI

33、B1.1標(biāo)準(zhǔn)牙型（牙底是平的或隨意倒圓的）的內(nèi)、外螺紋 圓弧牙底的UNR UNRC UNRF UNREF NRS只用于外螺紋而沒有內(nèi)螺紋NP- 一般用途的錐管螺紋NPSC管接頭用直管螺紋NPTR導(dǎo)桿連接用錐管螺紋NPSM機(jī)械連接用直管螺紋NPSL鎖緊螺母用直管螺紋NPSH軟管連接用直管螺紋以上為美國標(biāo)準(zhǔn)ANSIB1.20.1 牙型角為60的英制管螺紋NPTF干密封標(biāo)準(zhǔn)型錐管螺紋美國標(biāo)準(zhǔn)ANSIB1.20.3 I型PTF-SAE SHORT干密封短型錐管螺紋NPSF干密封標(biāo)準(zhǔn)型燃油用直管內(nèi)螺紋NPS1干密封標(biāo)準(zhǔn)型一般用直管內(nèi)螺紋美國標(biāo)準(zhǔn)美國標(biāo)準(zhǔn)美國標(biāo)準(zhǔn)ANS舊1.20.3ANS舊1.20.3AN

34、S舊1.20.3n型in型w型ACME 一般用途的梯形螺紋美國標(biāo)準(zhǔn)ANSIB1.5牙型角為29的英制傳動(dòng)螺紋尺寸和公差使用與標(biāo)準(zhǔn)系列相同的公式計(jì)算的標(biāo)準(zhǔn)系列之外的所有直徑與螺距組合。我國的60圓錐管螺紋 GB/T12716-1991與之等效。ACME（紋包括一般用途的和定心的兩種配合的梯形螺紋，其中一般用途者與我國標(biāo)準(zhǔn) GB/T5796-1986規(guī)定的梯形螺紋的性能相類同。螺距用每英寸的牙數(shù)來表示，如：每英寸 11牙，則螺距=25.4/11 = 2.309mm螺紋如何區(qū)分英制和公制？默認(rèn)分類2009-08-24 22:03:14 閱讀1281評論0 字號：大中小粗略判斷的話好像英制的比公職的牙

35、距大（同規(guī)格的）NPT PT, G 都是管螺紋.NPT是 National （American） Pipe Thread 的彳癥Sh H於美國襟準(zhǔn)的60 度錐管螺紋，用於北美地K.國家襟準(zhǔn)可查閱GB/T12716-1991PT是 Pipe Thread的縮癮，是 55度密封圄錐管螺紋，JS惠氏螺家族，多用於歐洲及英聯(lián)邦國 家.常用於水及煤氣管行業(yè)，錐度規(guī)定為1:16.國家襟準(zhǔn)可查閱GB/T7306-2000G是55度非螺紋密封管螺紋，JS惠氏螺家族.標(biāo)記為 G代表圄柱螺國家襟準(zhǔn)可查閱GB/T7307-2001 另外螺紋中的1/4、1/2、1/8 標(biāo)記是指螺尺寸的直軍位是英口寸.行內(nèi)人通常用分流

36、流!呼螺尺寸，一口寸等於8分，1/4 口寸就是2分，如此I推G好像就是管螺紋的統(tǒng)稱（Guan）, 55, 60度的劃分屬于功能性的，俗稱管圓。即螺紋由一圓柱面加工而成。ZG俗稱管錐，即螺紋由一圓錐面加工而成，一般的水管接頭都是這樣的，老國標(biāo)標(biāo)注為 Rc 公制螺紋用螺距來表示，美英制螺紋用每英寸內(nèi)的螺紋牙數(shù)來表示，這是它們最大的區(qū)別， 公制螺紋是60度等邊牙型，英制螺紋是等腰 55度牙型，美制螺紋60度。公制螺紋用公制單位，美英制螺紋用英制單位。管螺紋主要用來進(jìn)行管道的連接，其內(nèi)外螺紋的配合緊密，有直管與錐管兩種。公稱直徑是指所連接的管道 直徑，顯然螺紋大徑比公稱直徑大。1/4, 1/2, 1/

37、8是英制螺紋的公稱直徑，單位是英寸。英制螺紋標(biāo)準(zhǔn)規(guī)格表螺距mmP每英寸牙數(shù)tpi中徑mmd2=D2小徑 外螺紋d3牙型高H1底孔直徑mm寸Ww牙型代號大徑mmd=D1/16BSW1.5870.423601.3151.0500.2701.153/32”BSW2.3810.529482.0411.7030.3381.901/8”BSW3.1750.635402.7682.3620.4062.505/32BSW3.9690.793323.4592.9520.5073.203/16BSW4.7621.058244.0843.4070.6773.707/32BSW5.5561.058244.8784.2

38、010.6774.501/4BSW6.3501.270205.5374.7240.8135.105/16”BSW7.9381.411187.0346.1310.9046.503/8,BSW9.5251.588168.5097.4921.0177.907/16BSW11.1131.814149.9518.7891.1629.201/21BSW12.7002.1171211.3459.9901.35510.405/81BSW15.8762.3091114.39712.9181.47913.403/4BSW19.0512.5401017.42415.7981.62716.257/8BSW22.226

39、2.822920.41918.6111.80719.251BSW25.4003.175823.36821.3352.03322.0011/8BSW28.5763.629726.25323.9292.32424.5011/4BSW31.7513.629729.42827.1042.32427.2513/8BSW34.9264.233632.21529.5052.71130.2511/2BSW38.1004.233635.39132.6802.71133.5015/8BSW41.2775.080538.02434.7713.25335.5013/4BSW44.4525.080541.19937.9

40、463.25338.5017/8BSW47.6275.64541/244.01240.3983.61441.252”BSW50.8025.64541/247.18743.5733.61444.502”1/4BSW57.1526.350453.08649.0204.06650.002”1/2BSW63.5026.350459.43655.3704.06656.002”3/4BSW69.8537.25731/265.20560.5584.64761.503BSW76.2037.25731/271.55666.9094.64768.0031/4BSW82.5537.81631/477.54872.5

41、445.00573.7531/2BSW88.9037.81631/483.89978.8945.00580.0033/4BSW95.2548.467389.83284.4105.42285.504BSW101.6048.467396.18290.7605.42292.0041/4BSW107.9548.83527/8102.29796.6395.65798.0041/2BSW114.3048.83527/8108.647102.9905.657104.2043/4BSW120.6659.23723/4114.740108.6255.915110.005”BSW127.0059.23723/41

42、21.090115.1765.915116.505 1/4BSW133.3559.67725/8127.159120.9636.196122.505 1/2BSW139.7059.67725/8133.509127.3136.196128.505 3/4BSW146.05510.16021/2139.549133.0436.506134.506”BSW152.40610.16021/2145.900139.3946.506141.00英制普通螺紋-細(xì)牙 -BSF 英制普通螺紋（惠氏螺紋）-細(xì) 牙（BSW）大徑螺距中徑小徑名義尺寸每英寸牙數(shù)牙型高底孔直徑牙型代號mmmmmm外螺紋BSFtpiH1mmd=Dpd2=D2d33/16BSF4.7630.794324.2553.7470.5084.007/32BSF5.5560.907284.9754.3940.5814.601/4BSF6.3500.977265.7255.1000.6255.309/32BSF7.1420.977266.5185.8930.6256.105/16BSF7