美制螺纹最齐全大全
美制螺纹参数大全
美制螺纹参数大全
1、螺纹种类
（1）美制直插螺纹，主要包括：美制单螺纹UNC/UNF、双螺纹UNS、
美制外螺纹UNEF、美制内螺纹UN-2B；
（2）美制特殊螺纹，包括：美制特定角度牙螺纹、美制畸变牙螺纹、美制法兰螺纹（矩形牙、圆锥牙和接头）、美制外螺纹UNJ、美制攻牙螺
纹UNC-2A、美制攻牙螺纹UNF-2A、美制沉头螺纹UNRC和美制沉头螺纹UNRF；
（3）美制键槽螺纹，包括：美制原头螺纹UNJF、美制梯形螺纹UNC-
3A、美制六角螺纹UMS-3A、美制方形螺纹USS-3A；
（4）美制螺母螺纹，包括：美制内螺纹UN-2M、美制外螺纹UNS-2M。
2、螺纹细微尺寸参数
（1）螺纹基本尺寸参数：螺纹名称、螺纹基径、螺距、牙型、牙数、类型；
（2）螺纹细微尺寸参数：螺纹直径、根部牙齿形状和大小、锥度、
误差、螺距和牙顶形状和大小等；
（3）螺纹型腔尺寸参数：型腔螺距、型腔大小、误差、型腔圆度和
横档尺寸等。
3、螺纹位置参数
（1）螺纹位形参数：螺纹位形中心、六角锥螺纹位形、矩形锥螺纹
位形及对称多边形螺纹位形等；。
美制螺纹总集
UNS：特殊系列的统一螺纹（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） UN：恒定螺距系列的统一螺纹 UNC:粗Φ12.45 Φ12.22 Φ14.35 Φ14.68 Φ14.52 Φ17.68 Φ17.96 Φ17.82
无对应 无对应
内螺纹
14 15 16 17 18 19 公差等级有三个级别：1、2、3 A为外螺纹；B为内螺纹 NPSM：自由配合圆柱管螺纹 NPT：NPT是美制斜管螺纹，螺纹角是55度的，椎度1/16；
Φ25.18 Φ25.37 Φ25.28 Φ31.49 Φ31.71 Φ31.60
无对应
Φ42.62 Φ42.82 Φ42.72
11 12 13
1/2"-14NPSM-2B 9/16"-12UNC-2B 5/8"-18UNF-2B 3/4"-20UNEF-2B 13/16"-27UNS-2B 15/16"-27UNS-2B
20.65 无对应
Φ20.60 Φ14.07 Φ14.26 Φ14.17 Φ15.51 Φ15.84 Φ15.68 Φ18.81 Φ19.01 Φ18.91 Φ20.40 Φ20.60 Φ20.50
无对应 无对应 螺纹尺寸查询程序
外螺纹
13/16"-20UNEF-2A 13/16"-27UNS-2A 15/16"-27UNS-2A 1"-24UNS-2A 1 1/4"-18UNEF-2A 1 41/64"-20UNS-2A 1 11/16"-20UN-2A
1/2 是表示螺纹外径1/2英寸，14表示每英寸14牙。 UNEF：超细牙系列的统一螺纹 UNF：细牙系列的统一螺纹 1"-24UNS-2B 1 1/4"-18UNEF-2B 1 3/8"-18UNEF-2B 1 41/64"-20UNS-2B 1 11/16"-20UN-2B
国标英制美制螺纹大全
5/16 -18 6.50 7.02 6.41
3/8 -16 7.90 8.49 7.81
7/16 -14 9.30 9.93 9.15
1/2 -13 10.80 11.43 10.58
9/16 -12 12.20 12.91 12.00
5/8 -11 13.50 14.38 13.38
3/4 -10 16.50 17.40 16.30
2.96 3.64 4.32 5.00 6.55 8.17 9.75 11.39 12.98 14.59 16.18
3.12 3.82 4.50 5.18 6.72 8.35 9.93 11.59 13.18 14.80 16.39
3/4-16 19.50 19.39 19.61
美制號數牙之外徑換算
規格
NPT NPS 下孔徑 下孔徑
1/16 -27 6.20 6.35
1/8 -27 8.50 8.75
1/4 -18 11.00 11.15
3/8 -18 14.50 14.70
1/2 -14 18.00 18.15
3/4 -14 23.00 23.40
1
-11 1/2 29.00 29.40
1 1/4 -11 1/ 38.00 38.10
6.30 8.30 11.00 14.50 18.10
6.50 8.60 11.50 15.00 18.50
23.50 24.00
29.60 30.25
38.10 39.00 44.00 44.90
55.60 56.60
美 制管牙
6.70 8.70 11.70 15.25 19.00 21.00 24.50 28.00 30.50 35.50 39.50 45.00 51.00 57.00
美制螺纹尺寸
美制螺纹尺寸,美制螺纹尺寸表美制粗牙螺纹(NRT)(单位：mm)螺纹尺寸2B级螺纹用下孔径 3B级螺纹用下孔径RH精度最小～最大(嵌合率％)RH精度最小～最大(嵌合率％)NO. 2-56UNC4 1.96 ~ 2.02 (100~65) 3 1.95 ~ 2.01 (100~65) 3-48 4 2.25 ~ 2.32 (100~65) 3 2.23 ~ 2.31 (100~65) 4-40 5 2.52 ~ 2.60 (100~70) 3 2.50 ~ 2.58 (100~70) 5-40 5 2.86 ~ 2.93 (100~70) 3 2.83 ~ 2.91 (100~70) 6-32 5 3.09 ~ 3.17 (100~75) 3 3.06 ~ 3.14 (100~75) 8-32 6 3.75 ~ 3.83 (100~75) 4 3.74 ~ 3.82 (100~75) 10-24 6 4.26 ~ 4.35 (100~80) 4 4.24 ~ 4.32 (100~80) 12-24 6 4.92 ~ 5.01 (100~80) 4 4.90 ~ 4.96 (100~85) 1/4 -20 6 5.66 ~ 5.76 (100~80) 4 5.64 ~ 5.74 (100~80) 5/16 -18 7 7.18 ~ 7.29 (100~80) 5 7.15 ~ 7.24 (100~85) 3/8 -16 7 8.66 ~ 8.78 (100~80) 5 8.63 ~ 8.73 (100~85) 7/16 -14 7 10.11 ~10.25 (100~80) 5 10.08 ~10.19 (100~85) 1/2 -13 8 10.62 ~11.78 (100~80) 6 11.60 ~11.68 (100~90) 9/16 -12 10 13.14 ~13.27 (100~85) 8 13.11 ~13.24 (100~85) 5/8 -11 11 14.62 ~14.76 (100~85) 8 14.58 ~14.67 (100~90) 3/4 -10 12 17.67 ~17.88 (100~80) 9 17.63 ~17.74 (100~90) 7/8 - 9 12 20.68 ~20.85 (100~85) 9 20.64 ~20.75 (100~90) 1 - 8 13 23.65 ~23.84 (100~85) 10 23.61 ~23.74 (100~90) 美制细牙螺纹(NRT)(单位：mm)螺纹尺寸2B级螺纹用下孔径 3B级螺纹用下孔径RH精度最小～最大(嵌合率％)RH精度最小～最大(嵌合率％)NO. 2-64UNF 3 1.98 ~ 2.04 (100~65) 2 1.97 ~ 2.03 (100~65)3-56 4 2.29 ~ 2.35 (100~65) 3 2.28 ~ 2.34 (100~65) 4-48 4 2.57 ~ 2.64 (100~70) 3 2.56 ~ 2.63 (100~70) 5-44 4 2.88 ~ 2.95 (100~70) 3 2.87 ~ 2.94 (100~70) 6-40 5 3.19 ~ 3.26 (100~70) 3 3.16 ~ 3.22 (100~75) 8-36 5 3.80 ~ 3.88 (100~75) 4 3.79 ~ 3.86 (100~75) 10-32 5 4.41 ~ 4.48 (100~80) 4 4.40 ~ 4.46 (100~80) 12-28 5 5.00 ~ 5.08 (100~80) 4 4.99 ~ 5.06 (100~80) 1/4 -28 5 5.86 ~ 5.93 (100~80) 4 5.85 ~ 5.92 (100~80) 5/16-24 6 7.38 ~ 7.46 (100~80) 5 7.36 ~ 7.43 (100~85) 3/8 -24 6 8.96 ~ 9.05 (100~80) 5 8.95 ~ 9.02 (100~85) 7/16-20 7 10.44 ~10.54 (100~80) 5 10.41 ~10.49 (100~85) 1/2 -20 7 12.02 ~12.12 (100~80) 5 12.00 ~12.05 (100~90) 9/16-18 9 13.55 ~13.66 (100~80) 7 13.53 ~13.58 (100~90) 5/8 -18 9 15.14 ~15.25 (100~80) 7 15.11 ~15.17 (100~90) 3/4 -16 10 18.22 ~18.32 (100~85) 7 18.18 ~18.25 (100~90) 7/8 -14 11 21.27 ~21.38 (100~85) 8 21.23 ~21.27 (100~95) 1 - 12 12 24.28 ~24.41 (100~85) 9 24.24 ~24.32 (100~90)美制粗牙螺纹(单位：mm)钻头直螺纹尺寸下孔径径最小直径最大直径NO. 2 –56UNC 2.29 2.39 2.33 –48 2.64 2.74 2.74 –40 2.95 3.07 3.05 –40 3.25 3.38 3.36 –32 3.66 3.81 3.78 –32 4.32 4.47 4.410 –24 5.05 5.21 5.112 –24 5.61 5.77 5.71/4 –20 6.63 6.78 6.75/16 –8 8.33 8.48 8.43/8 –16 9.91 10.11 10.07/16 –14 11.51 11.76 11.51/2 –13 13.08 13.34 13.19/16 –12 14.68 14.94 14.7美制细牙螺纹(单位：mm)钻头直螺纹尺寸下孔径径最小直径最大直径NO. 4 –48UNF 2.97 3.05 3.06 –40 3.66 3.78 3.78 –36 4.32 4.44 4.410 –32 4.98 5.13 5.01/4 –28 6.53 6.71 6.65/16 –24 8.20 8.38 8.23/8 –24 9.78 9.96 9.87/16 –20 11.43 11.63 11.51/2 –20 13.03 13.26 13.19/16 –18 14.66 14.88 14.75/8 –18 16.26 16.48 16.33/4 –16 19.43 19.68 19.57/8 –14 22.61 22.86 22.71 –12 25.76 26.04 26.0美制管螺纹尺寸表一览：用螺纹密封的管螺纹基本尺寸(R)尺寸代号每英寸牙数螺距基准面上的基准尺寸基准距离有效螺纹长度大径小径1/16 28 0.907 7.723 6.561 4.0 6.51/8 28 0.907 9.728 8.566 4.0 6.51/4 19 1.337 13.157 11.445 6.0 9.73/8 19 1.337 16.662 14.950 6.4 10.11/2 14 1.814 20.955 18.631 8.2 13.23/4 14 1.814 26.441 24.117 9.5 14.51 11 2.309 33.249 30.291 10.4 16.81¼11 2.309 41.910 38.952 12.7 19.11½11 2.309 47.803 44.845 12.7 19.12 11 2.309 59.614 56.656 15.9 23.42½11 2.309 75.184 72.226 17.5 26.73 11 2.309 87.884 84.926 20.6 29.83½11 2.309 100.330 97.372 22.2 31.44 11 2.309 113.030 110.072 25.4 35.85 11 2.309 138.430 135.472 28.6 40.16 11 2.309 163.830 160.872 28.6 40.1R—密封用管螺纹：Rc-圆锥内螺纹Rp-圆柱内螺纹R-圆锥外螺纹G—非密封用管螺纹60°圆锥管螺纹基本尺寸(NPT)尺寸代号每英寸牙数螺距基准面上的基准尺寸基准距离装配余量(牙数) 大径小径。
(美制-米制)常用螺纹表
圆锥外螺纹：位于垂直于螺纹轴线、与小端面相 距一个基准距离的平面内；
基准平面位置
圆锥外螺纹：位于垂直于螺纹轴线、与小端面相 距一个基准距离的平面内； 圆柱和圆锥内螺纹：位于垂直于螺纹轴线的端面 面内；当内螺纹大端面倒角的大径大于内螺纹在 此端面内的大径时，内螺纹基准平面的理论位置 位于内螺纹大径圆柱或大径圆锥与倒角相交轴向 位置、垂直于螺纹轴线的平面内。
圆锥外螺纹：位于垂直于螺纹轴线、与小端面相距一个基准距 离的平面内；
圆柱和圆锥内螺纹：位于垂直于螺纹轴线、深入 大端面以内半个螺距的平面内；
无
圆锥内螺纹：位于垂直于螺纹轴线的端面内；
配合方式
圆柱内螺纹/圆锥外螺纹
圆柱内螺纹/圆锥外螺纹
和圆锥外螺纹NPTF可以相配的有圆锥内螺纹NPTF，PTF-SAE SHORT短型圆锥内螺纹，NPSF圆柱内螺纹，NPSI圆柱内螺纹； 和短型圆锥外螺纹PTF-SAE SHORT可以相配的有NPSI圆柱内螺 纹，NPTF圆锥内螺纹； 注：短型内螺纹与短型外螺纹（PTF-SAE SHORT）不能形成配合； 右旋一种
圆锥或短锥外螺纹用锥光环、锥螺环 圆锥或短锥内螺纹用锥光塞、锥螺塞
圆柱内螺纹用6H螺塞 圆锥外螺纹用锥光环、锥螺环 圆锥内螺纹用光塞、锥螺塞
主要应用场合
主要用于冷却器、船舶、汽车、飞机等的燃油、润滑油管路接 头，加既可实现密封联结。 可不加密封填料
气体、液体管路系统的卡套、管接头等
备注
可加密封填料；
补充
NPT和NPTF螺纹可以配合使用，但不能保证在无密封填 料时，螺纹副的密封性能。
之所以具有密封性能是对一般用途管螺纹的牙型进行了调整，使 内外螺纹的牙底略宽于牙顶（牙底的削平量稍大），这样较尖的 使用中不能用普通螺纹的内螺纹与米制圆锥螺纹的外螺纹组成密封连 牙顶就能在较宽的牙底处被挤压变形而消除了大小径间的间隙。 接；因为米制密封圆柱内螺纹的的精度要高于普通内螺纹； 可想而知，牙顶高和牙底高的微小尺寸差异需要控制在一定的精 度范围内。
(美制-米制)常用螺纹表
螺纹特征代号
圆柱内螺纹NPSC；圆锥内螺纹NPT；圆锥外螺纹NPT
标记示例 牙型角 牙型 锥度 每英寸牙数
螺纹特征代号 螺纹尺寸代号 旋向 NPT3(中标)；3-8NPT(美标) NPT4-LH(中标)；4-8NPT-LH(美标) 60° 平顶平底 圆锥：2tgα=1∶16 / 斜角α=1°47’24” 圆柱：0 27、18、14、11.5、8
圆柱内螺纹/圆锥外螺纹
圆锥内螺纹/圆锥外螺纹 螺纹旋向 右旋、左旋两种
圆锥内螺纹/圆锥外螺纹 右旋、左旋两种 外螺纹最小有效螺纹长度=实际基准距离+装配余量；内 螺纹的最小有效螺纹长度应不小于其基准平面位置的实 际偏差、基准距离的基本尺寸与装配余量之和。
圆锥内螺纹/圆锥外螺纹 右旋一种 螺距1：标准型不小于8/短型不小于5； 螺距1.5：标准型不小于11/短型不小于7； 螺距2：标准型不小于16/短型不小于10； 内螺纹尾部采用退刀槽时不小于上述数值的80%；
常用密封螺纹一览表
名称
参数标准 检验标准
（英制）55°一般密封管螺纹：R/Rp/Rc 英制）55°一般密封管螺纹： Rp/
GB/T7306.1（柱/锥）、GB/T7306.2（锥/锥） GB/T10031(ISO7-2:2000) 圆柱内螺纹Rp；圆锥内螺纹Rc；圆锥外螺纹R1（与圆 柱内螺纹配合）；R2（与圆锥外螺纹配合） 螺纹特征代号 螺纹尺寸代号 旋向 单一螺纹标记：Rp1/8；Rc1/4LH；R13/8；R23/8 配合标记：Rp/R13/8；Rc/R23/8LH 55° 圆顶圆底 圆锥：2tgα=1∶16 / 斜角α=1°47’24” 圆柱：0 28、19、14、11
圆锥或短锥外螺纹用锥光环、锥螺环 圆锥或短锥内螺纹用锥光塞、锥螺塞
美制螺纹——精选推荐
美制螺纹美制螺纹UNC：统⼀粗⽛螺纹5/16：螺纹公称尺⼨，单位为英⼨18：螺距为1/18，即每英⼨18⽛3A：公差等级，三级，外螺纹（B为内螺纹）R.H：右旋1/4-18NPSC-2B （美国标准管螺纹）NPSC管接头⽤圆柱内螺纹公称尺⼨1/4 每英⼨18⽛2级内螺纹1/4-20UNC-2B （美国、英国和加拿⼤统⼀螺纹）UNC粗⽛螺纹公称尺⼨1/4 每英⼨20⽛2级内螺纹（B指内螺纹）英制螺纹表⽰法？美制螺纹表⽰法？例如：1/4-36 UNS 2B是什么螺纹？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，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UNS 特殊系列的统⼀螺纹（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）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美制螺纹5/16-18unc-2B;3/8-16UNF-2B;1/2-20UNF-2B；的⼤径，中径，⼩径分别是多少？5/16-18unc-2B;⼤径min:0.3125中径0.2764~0.2817⼩径0.252~0.2653/8-16UNC-2B⼤径min:0.3750中径03344~0.3401⼩径0.307~0.3211/2-20UNF-2B⼤径min:0.5000中径0.4675~0.4731⼩径0.446~0.457备注：将上述尺⼨X25.4即可换算为公制毫⽶。
英制、美制螺纹牙距大全
BSF-英制惠氏55度细牙螺纹BSW-英制惠氏55度粗牙螺纹UN-美制60度不变螺距螺纹UNC-美制60度粗牙螺纹（代号：NC）UNF-美制60度细牙螺纹（代号：NF）UNEF-美制60度超细牙螺纹UNS-美制60度特殊螺纹NPT-美制60度一般用途管螺纹（旧代号：Z、K）NPSC-美制60度管接头内螺纹NPSM-美制60度，设备上自由配合，机械连接用直管螺纹G-美制60度直管螺纹R-美制60度锥管螺纹（旧代号：ZG、KG）RC-美制60度锥管内螺纹NPTF-美制60度干密封锥管螺纹NPSF-美制60度干密封直管螺纹NGT-美制60度气瓶用锥螺纹2M-米制55度锥管螺纹SM-缝纫机螺纹PZ-气瓶用螺纹5V1-20V1-气门芯螺纹LH-旋向代号，左旋螺纹。
右旋（正扣）省略不标G2-非密封内螺纹。
G2A-与A级圆柱外螺纹组成螺纹副。
G3A-非密封外螺纹。
G4B-LH-非密封左旋，4的B级。
55度锥螺纹有1：16的锥度。
No.0-80 UNF-2B --NO.-表示代号，0-表示直径，80-表示牙数，UNF-表示，2-表示：螺纹精度等级，有1、2、3级，3级为无间隙配合，用于精度高场合。
2级为一般用途坚固螺纹。
1级为配合后螺纹间隙大。
B-表示：内螺纹（A表示外螺纹，省略不标）NO.1-64UNC NO.1-72UNC NO.2-56UNC NO.2-64UNC NO.3-48UNC NO.3-56UNC NO.4-40UNC NO.4-48UNC NO.5-40UNC NO.5-44UNF NO.6-32UNC NO.6-40UNF NO.8-32UNC NO.8-36UNF NO.10-24UNC No.10-28UNS No.10-32UNF No.10-36UNS No.10-40UNSNo.10-48UNS No.10-56UNS No.10-64UNS No.10-72UNS No.10-80UNSNo.12-24UNC No.12-28UNF No.12-32UNEF No.12-36UNS No.12-40UNSNo.12-48UNS No.12-56UNS No.12-64UNS No.12-72UNS No.12-80UNS1/4-20UNC 1/4-22UNS 1/4-24UNS 1/4-27UNS 1/4-28UNF 1/4-32UNEF 1/4-36UNS 1/4-40UNS 1/4-48UNS1/4-56UNS 1/4-64UNS 1/4-72UNS 1/4-80UNS5/16-18UNC 5/16-20UN 5/16-24UNF 5/16-26UNS5/16-27UNS 5/16-28UN 5/16-32UNEF 5/16-36UNS5/16-40UNS5/16-48UNS 5/16-56UNS 5/16-64UNS 5/16-72UNS5/16-80UNS3/8-16UNC 3/8-18UNS 3/8-20UN 3/8-22UN 3/8-24UNF 3/8-26UN 3/8-27UNS 3/8-28UN 3/8-32UNEF 3/8-36UNS3/8-40UNS 3/8-48UNS 3/8-56UNS 3/8-64UNS 3/8-72UNS 3/8-80UNS7/16-14UNC 7/16-16UN 7/16-18UNS 7/16-20UNF7/16-24UNS 7/16-27UNS 7/16-28UNEF 7/16-32UN7/16-36UNS 7/16-40UNS 7/16-48UNS 7/16-56UNS7/16-64UNS 7/16-72UNS 7/16-80UNS1/2-12UNS 1/2-13UNC 1/2-14UNS 1/2-16UN 1/2-18UNS 1/2-20UNF1/2-24UNS 1/2-27UNS 1/2-28UNEF 1/2-32UN 1/2-36UNS 1/2-40UNS 1/2-48UNS 1/2-56UNS 1/2-64UNS 1/2-72UNS1/2-80UNS9/16-12UNC 9/16-14UNS 9/16-16UN 9/16-18UNF9/16-20UN 9/16-24UNEF 9/16-28UN 9/16-32UN9/16-36UNS 9/16-40UNS 9/16-48UNS 9/16-56UNS9/16-72UNS5/8-11UNC 5/8-12UN 5/8-14UNS 5/8-16UN 5/8-18UNF5/8-20UN5/8-24UNEF 5/8-27UNS 5/8-28UN 5/8-32UN5/8-36UNS 5/8-40UNS 5/8-48UNS5/8-56UNS11/16-12UN 11/16-16UN 11/16-20UN 11/16-24UNEF11/16-28UN 11/16-32UN 11/16-40UN 11/16-48UN11/16-56UN3/4-10UNC 3/4-12UN 3/4-14UNS 3/4-16UNF 3/4-18UNS 3/4-20UNEF3/4-24UNS 3/4-27UNS 3/4-28UN 3/4-32UN 3/4-36UNS 3/4-40UNS 3/4-48UNS 3/4-56UNS13/16-12UN 13/16-16UN 13/16-20UNEF 13/16-28UN13/16-32UN7/8-9UNC 7/8-10UNS 7/8-12UN 7/8-14UNF 7/8-16UN 7/8-18UN 7/8-20UNEF 7/8-24UNS 7/8-27UNS 7/8-28UN 7/8-32UN 7/8-36UN 7/8-40UN15/16-12UN 15/16-16UN 15/16-20UNEF 15/16-28UN15/16-32UN1-8UNC 1-10UN 1-12UNF 1-14UNS 1-16UNS1-18UNS 1-20UNEF 1-24UN 1-27UNS 1-28UNS 1-32UNS 1-36UNS 1-40UNS1 1/16-8UN 1 1/16-12UN 1 1/16-16UN1 1/16-18UNEF 1 1/16-20UN 1 1/16-28UN1 1/8-7UNC 1 1/8-8UN 1 1/8-10UNS 1 1/8-12UNF 1 1/8-14UNS 1 1/8-16UN 1 1/8-18UNEF1 1/8-20UN 1 1/8-24UNS 1 1/8-28UN1 3/16-8UN 1 3/16-12UN 1 3/16-16UN1 3/16-18UNEF 1 3/16-20UN 1 3/16-28UN1 1/4-7UNC 1 1/4-8UN 1 1/4-10UNS 1 1/4-12UNF 1 1/4-14UNS 1 1/4-16UN 1 1/4-18UNEF1 1/4-20UN 1 1/4-24UNS 1 1/4-28UN1 5/16-8UN 1 5/16-12UN 1 5/16-16UN1 5/16-18UNEF 1 5/16-20UN1 5/16-28UN1 3/8-6UNC 1 3/8-10UNS 1 3/8-12UNF1 3/8-14UNS 1 3/8-16UN1 3/8-18UNEF 1 3/8-20UN 1 3/8-24UNS 1 3/8-28UN 1 7/16-6UN 1 7/16-8UN 1 7/16-12UN 1 7/16-16UN1 7/16-18UNEF 1 7/16-20UN 1 7/16-28UN1 1/2-6UNC 1 1/2-8UN 1 1/2-10UNS 1 1/2-12UNF1 1/2-14UNS 1 1/2-16UN 1 1/2-18UNEF 1 1/2-20UN1 1/2-24UNS 1 1/2-28UN1 9/16-6UN 1 9/16-8UN 1 9/16-10UN1 9/16-12UN 1 9/16-16UNEF1 9/16-18UN 1 9/16-20U 1 9/16-6UN 1 9/16-8UN1 9/16-10UN 1 9/16-12UN 1 9/16-16UNEF1 9/16-18UN 1 9/16-20UN15/8-6UN 1 5/8-8UN 1 5/8-10UNS 1 5/8-12UN1 5/8-14UNS 1 5/8-16UN1 5/8-18UNEF 1 5/8-20UN 1 5/8-24UNS1 11/16-6UN 1 11/16-8UN 1 11/16-12UN1 11/16-16UN 1 11/16-18UNEF 1 11/16-20UN1 3/4-5UN 1 3/4-6UN 1 3/4-8UN 1 3/4-10UN1 3/4-12UN 1 3/4-14UNS1 3/4-16UN 1 3/4-18UNS 1 3/4-20UN1 13/16-6UN 1 13/16-8UN 1 13/16-12UN1 13/16-16UN 1 13/16-20UN1 7/8-6UN 1 7/8-8UN 1 7/8-10UNS 1 7/8-12UN 1 7/8-14UNS 1 7/8-16UN 1 7/8-18UNS 1 7/8-20UN 1 15/16-6UN 1 15/16-8UN 1 15/16-12UN1 15/16-16UN 1 15/16-20UN2-4.5UNC 2-6UN 2-8UN 2-10UNS 2-12UN2-14UNS 2-16UN 2-18UNS 2-20UN2 1/16-16 2 3/16-6 2 5/16-16 2 7/16-162 1/8-6UN 2 1/8-8UN 2 1/8-12UN 2 1/8-16UN2 1/8-20UN2 1/4-4.5UNC 2 1/4-6UN 2 1/4-8UN 2 1/4-10UN2 1/4-12UN 2 1/4-14UN2 1/4-16UN 2 1/4-18UN 2 1/4-20UN2 3/8-6UN 2 3/8-8UN 2 3/8-12UN 2 3/8-16UN2 3/8-20UN2 1/2-4UNC 2 1/2-6UN 2 1/2-8UN 2 1/2-10UN2 1/2-12UN 2 1/2-14UN2 1/2-16UN 2 1/2-18UN 2 1/2-20UN2 5/8-6UN 2 5/8-8UN 2 5/8-12UN 2 5/8-16UN2 5/8-20UN2 3/4-4UNC 2 3/4-6UN 2 3/4-8UN 2 3/4-12UN2 3/4-16UN 2 3/4-20UN2 7/8-6UN 2 7/8-8UN 2 7/8-12UN 2 7/8-16UN2 7/8-20UN3-4UNC 3-6UN 3-8UN 3-12UN 3-16UN 3-20UN 牙型角为55度螺纹方向分：正牙（右牙）和反牙（左牙=LH）BSW英国惠氏粗牙螺纹板牙/BSW英制扳牙公称直经-每英寸牙数-螺纹系列代号1/8-40BSW 3/16-24BSW 1/4-20BSW 5/16-18BSW3/8-16BSW 7/16-14BSW 1/2-12BSW 9/16-12BSW5/8-11BSW 11/16-11BSW 3/4-10BSW 7/8-9BSW1-8BSW 1 1/8-7BSW 1 1/4-7BSW 1 1/2-6BSW1 3/4-5BSW 2-4.5BSW2 1/4-4BSW 2 1/2-4BSW2 3/4-3.5BSW 3-3.5BSW3 1/4-3.1/4BSW3 1/2-3.1/4BSW 3 3/4-3BSW 4-3BSW4 1/2-2.7/8BSW 5-3/4BSW 6-2.1/2BSW55度BSF英国惠氏细牙螺纹公称直经-每英寸牙数-螺纹系列代号3/16-32BSF 7/32-28BSF 1/4-26BSF 9/32-26BSF5/16-22BSF 3/8-20BSF 7/16-18BSF 1/2-16BSF9/16-16BSF 5/8-14BSF 11/16-14BSF 3/4-12BSF7/8-11BSF 1-10BSF 1 1/8-9BSF 1 1/4-9BSF1 3/8-8BSF 1 1/2-8BSF 1 5/8-8BSF1 3/4-7BSF 2-7BSF2 1/4-6BSF 2 1/2-6BSF2 3/4-6BSF 3-5BSF3 1/4-5BSF 3 1/2-4.5BSF3 3/4-4.5BSF 4-4.5BSF4 1/4-4BSF。
螺纹号(美制)
最大最小最小1最大最小公差范圍最小最大最小最大公差范圍2A 0.00050.05950.0563…0.05140.04960.00180.04462B 0.04650.05140.05190.05420.00230.06003A 0.00000.06000.0568…0.05190.05060.00130.04513B 0.04650.05140.05190.05360.00170.06002A 0.00060.07240.0686…0.06230.06030.00200.05382B 0.05610.06230.06290.06550.00260.07303A 0.00000.07300.0692…0.06290.06140.00150.05443B 0.05610.06230.06290.06480.00190.07302A 0.00060.07240.0689…0.06340.06150.00190.05592B 0.05800.06350.06400.06650.00250.07303A 0.00000.07300.0695…0.06400.06260.00140.05653B 0.05800.06350.06400.06590.00190.07302A 0.00060.08540.0813…0.07380.07170.00210.06422B 0.06670.07370.07440.07720.00280.08603A 0.00000.08600.0819…0.07440.07280.00160.06483B 0.06670.07370.07440.07650.00210.08602A 0.00060.08540.0816…0.07530.07330.00200.06682B 0.06910.07530.07590.07860.00270.08603A 0.00000.08600.0822…0.07590.07440.00150.06743B 0.06910.07530.07590.07790.00200.08602A 0.00070.09830.0938…0.08480.08250.00230.07342B 0.07640.08450.08550.08850.00300.09903A 0.00000.09900.0945…0.08550.08380.00170.07413B 0.07640.08450.08550.08770.00220.09902A 0.00070.09830.0942…0.08670.08450.00220.07712B 0.07970.08650.08740.09020.00280.09903A 0.00000.09900.0949…0.08740.08580.00160.07783B 0.07970.08650.08740.08950.00210.09902A 0.00080.11120.1061…0.09500.09250.00250.08142B 0.08490.09390.09580.09910.00330.11203A 0.00000.11200.1069…0.09580.09390.00190.08223B 0.08490.09390.09580.09820.00240.11202A 0.00070.11130.1068…0.09780.09540.00240.08642B 0.08940.09680.09850.10160.00310.11203A 0.00000.11200.1075…0.09850.09670.00180.08713B 0.08940.09680.09850.10080.00230.11202A 0.00080.12420.1191…0.10800.10540.00260.09442B 0.09790.10620.10880.11210.00330.12503A 0.00000.12500.1199…0.10880.10690.00190.09523B 0.09790.10620.10880.11130.00250.12502A 0.00070.12430.1195…0.10950.10700.00250.09722B 0.10040.10790.11020.11340.00320.12503A 0.00000.12500.1202…0.11020.10830.00190.09793B 0.10040.10790.11020.11260.00240.12502A 0.00080.13720.1312…0.11690.11410.00280.10002B 0.10400.1140.11770.12140.00370.13803A 0.00000.13800.1320…0.11770.11560.00210.10083B 0.10400.11400.11770.12040.00270.13802A 0.00080.13720.1321…0.12100.11840.00260.10742B 0.1110.1190.12180.12520.00340.13803A 0.00000.13800.1329…0.12180.11980.00200.10823B 0.11100.11860.12180.12430.00250.13802A 0.00090.16310.1571…0.14280.13990.00290.12592B 0.1300.1390.14370.14750.00380.16403A 0.00000.16400.1580…0.14370.14150.00220.12683B 0.13000.13890.14370.14650.00280.16402A 0.00080.16320.1577…0.14520.14240.00280.13012B 0.1340.1420.14600.14960.00360.16403A 0.00000.16400.1585…0.14600.14390.00210.13093B0.13400.14160.14600.14870.00270.16406-40/0.138-40UNF 8-32/0.164-32UNC 8-36/0.164-36UNF0-80/0.060-80UNF 1-64/0.073-64UNC 1-72/0.073-72UNF 允許偏差倒2-56/0.086-56UNC 2-64/0.086-64UNF 等級角最小等級5-44/0.125-44UNF 3-48/0.099-48UNC 3-56/0.099-56UNF 4-48/0.112-48UNF 4-40/0.112-40UNC 6-32/0.138-32UNC 5-40/0.125-40UNC最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級2A 0.00100.18900.1818…0.16190.15860.00330.13942B 0.1450.1560.16290.16720.00430.19003A 0.00000.19000.1828…0.16290.16040.00250.14043B 0.14500.15550.16290.16610.00320.19002A 0.00090.18910.1831…0.16880.16580.00300.15192B 0.1560.1640.16970.17360.00390.19003A 0.00000.19000.1840…0.16970.16740.00230.15283B 0.15600.16410.16970.17260.00290.19002A 0.00100.21500.2078…0.18790.18450.00340.16542B 0.1710.1810.18890.19330.00440.21603A 0.00000.21600.2088…0.18890.18630.00260.16643B 0.17100.18070.18890.19220.00330.21602A 0.00100.21500.2085…0.19180.18860.00320.17242B 0.1770.1860.19280.19700.00420.21603A 0.00000.21600.2095…0.19280.19040.00240.17343B 0.17700.18570.19280.19590.00310.21602A 0.00090.21510.2091…0.19480.19170.00310.17792B 0.1820.1900.19570.19980.00410.21603A 0.00000.21600.2100…0.19570.19330.00240.17883B 0.18200.18950.19570.19880.00310.21601A 0.00110.24890.2367…0.21640.21080.00560.18941B 0.1960.2070.21750.22480.00730.25002A 0.00110.24890.24080.23670.21640.21270.00370.18942B 0.1960.2070.21750.22240.00490.25003A 0.00000.25000.2419…0.21750.21470.00280.19053B 0.19600.20670.21750.22110.00360.25001A 0.00100.24900.2392…0.22580.22080.00500.20641B 0.2110.2200.22680.23330.00650.25002A 0.00100.24900.2425…0.22580.22250.00330.20642B 0.2110.2200.22680.23110.00430.25003A 0.00000.25000.2435…0.22680.22430.00250.20743B 0.21100.21900.22680.23000.00320.25002A 0.00100.24900.2430…0.22870.22550.00320.21182B 0.2160.2240.22970.23390.00420.25003A 0.00000.25000.2440…0.22970.22730.00240.21283B 0.21600.22290.22970.23280.00310.25001A 0.00120.31130.2982…0.27520.26910.00610.24521B 0.2520.2650.27640.28430.00790.31252A 0.00120.31130.30260.29820.27520.27120.00400.24522B 0.2520.2650.27640.28170.00530.31253A 0.00000.31250.3038…0.27640.27340.00300.24643B 0.25200.26300.27640.28030.00390.31252A 0.00120.31130.3032…0.27880.27480.00400.25182B 0.2580.2700.28000.28520.00570.31253A 0.00000.31250.3044…0.28000.27700.00300.25303B 0.25800.26800.28000.28390.00390.31251A 0.00110.31140.3006…0.28430.27880.00550.26181B 0.2670.2770.28540.29250.00710.31252A 0.00110.31140.3042…0.28430.28060.00370.26182B 0.2670.2770.28540.29020.00480.31253A 0.00000.31250.3053…0.28540.28270.00270.26293B 0.26700.27540.28540.28900.00360.31252A 0.00100.31150.3050…0.28830.28490.00340.26892B 0.2740.2820.28930.29370.00440.31253A 0.00000.31250.3060…0.28930.28670.00260.26993B 0.27400.28070.28930.29260.00330.31252A 0.00100.31160.3055…0.29120.28800.00320.27432B 0.2790.2860.29220.29640.00420.31253A 0.00000.31250.3065…0.29220.28980.00240.27533B0.27900.28470.29220.29530.00310.31255/16-32/0.3125-32UNEF5/16-20/0.3125-20UN 5/16-24/0.3125-24UNF 5/16-28/0.3125-28UN1/4-28/0.250-28UNF 1/4-32/0.250-32UNEF 5/16-18/0.3125-18UNC 12-28/0.216-28UNF 12-32/0.216-32UNEF 1/4-20/0.250-20UNC10-24/0.190-24UNC 10-32/0.190-32UNF 12-24/0.216-24UNC最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級1A 0.00130.37370.3595…0.33310.32660.00650.29921B 0.3070.3210.33440.34290.00850.37502A 0.00130.37370.36430.35950.33310.32870.00440.29922B 0.3070.3210.33440.34010.00570.37503A 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0.00150.49850.48760.48220.44850.44350.00500.40692B 0.4170.4340.45000.45650.00650.50003A 0.00000.50000.4891…0.45000.44630.00370.40843B 0.41700.42840.45000.45480.00480.50002A 0.00140.49860.4892…0.45800.45330.00470.42412B 0.4320.4460.45940.46550.00610.50003A 0.00000.50000.4906…0.45940.45590.00350.42553B 0.43200.44190.45940.46400.00460.50001A 0.00130.49870.4865…0.46620.45980.00640.43921B 0.4460.4570.46750.47590.00840.50002A 0.00130.49870.4906…0.46620.46190.00430.43922B 0.4460.4570.46750.47310.00560.50003A 0.00000.50000.4919…0.46750.46430.00320.44053B0.44600.45370.46750.47170.00420.50003/8-24/0.375-24UNF 3/8-28/0.375-28UN 3/8-16/0.375-16UNC 3/8-20/0.375-20UN 3/8-32/0.375-32UNEF 7/16-14/0.4375-14UNC 7/16-28/0.4375-28UNEF 7/16-32/0.4375-32UN 7/16-16/0.4375-16UN 7/16-20/0.4375-20UNF1/2-20/0.500-20UNF1/2-13/0.500-13UNC 1/2-16/0.500-16UN最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級2A 0.00110.49890.4924…0.47570.47200.00370.45632B 0.4610.4700.47680.48160.00480.50003A 0.00000.50000.4935…0.47680.47400.00280.45743B 0.46100.46760.47680.48040.00360.50002A 0.00100.49900.4930…0.47870.47520.00350.46182B 0.4660.4740.47970.48420.00450.50003A 0.00000.50000.4940…0.47970.47710.00260.46283B 0.46600.47190.47970.48310.00340.50001A 0.00160.56090.5437…0.50680.49900.00780.46171B 0.4720.4900.50840.51860.01020.56252A 0.00160.56090.54950.54370.50680.50160.00520.46172B 0.4720.4900.50840.51520.00680.56253A 0.00000.56250.5511…0.50840.50450.00390.46333B 0.47200.48430.50840.51350.00510.56252A 0.00140.56110.5517…0.52050.51580.00470.48662B 0.4950.5090.52190.52800.00610.56253A 0.00000.56250.5531…0.52190.51840.00350.48803B 0.49500.50400.52190.52650.00460.56251A 0.00140.56110.5480…0.52500.51820.00680.49501B 0.5020.5150.52640.53530.00890.56252A 0.00140.56110.5524…0.52500.52050.00450.49502B 0.5020.5150.52640.53230.00590.56253A 0.00000.56250.5538…0.52640.52300.00340.49643B 0.50200.51060.52640.53080.00440.56252A 0.00130.56120.5531…0.52870.52450.00420.50172B 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0.00000.62500.6136…0.57090.56680.00410.52583B 0.53500.54630.57090.57620.00530.62502A 0.00140.63260.6142…0.58300.57820.00480.54912B 0.5570.5710.58440.59060.00620.62503A 0.00000.62500.6156…0.58440.58080.00360.55053B 0.55700.56620.58440.58900.00460.62501A 0.00140.62360.6105…0.58750.58050.00700.55751B 0.5650.5780.58890.59800.00910.62502A 0.00140.62360.6149…0.58750.58280.00470.55752B 0.5650.5780.58890.59490.00600.62503A 0.00000.62500.6163…0.58890.58540.00350.55893B0.5650.57300.58890.59340.00450.62505/8-18/0.625-18UNF5/8-11/0.625-11UNC 5/8-12/0.625-12UN 5/8-16/0.625-16UN 9/16-24/0.5625-24UNEF 9/16-28/0.5625-28UN 9/16-32/0.5625-32UN 9/16-20/0.5625-20UN1/2-28/0.500-28UNEF 9/16-16/0.5625-16UN 9/16-18/0.5625-18UNF 1/2-32/0.500-32UN 9/16-12/0.5625-12UNC最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級2A 0.00130.62370.6156…0.59120.58690.00430.56422B 0.5710.5820.59250.59810.00560.62503A 0.00000.62500.6169…0.59250.58930.00320.56553B 0.57100.57870.59250.59670.00420.62502A 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0.63300.64120.65500.65920.00420.68752A 0.00120.68630.6791…0.65920.65520.00400.63672B 0.6420.6520.66040.66560.00520.68753A 0.00000.68750.6803…0.66040.65740.00300.63793B 0.64200.64940.66040.66430.00390.68752A 0.00110.68640.6799…0.66320.65940.00380.64382B 0.6490.6570.66430.66920.00490.68753A 0.00000.68750.6810…0.66430.66150.00280.64493B 0.64900.65510.66430.66800.00370.68752A 0.00110.68640.6804…0.66610.66250.00380.64922B 0.6540.6610.66720.67180.00460.68753A 0.00000.68750.6815…0.66720.66450.00270.65033B 0.65400.65940.66720.67070.00350.68751A 0.00180.74820.7288…0.68320.67440.00880.62911B 0.6420.6630.68500.69650.01150.75002A 0.00180.74820.73530.72880.68320.67730.00590.62912B 0.6420.6630.68500.69270.00770.75003A 0.00000.75000.7371…0.68500.68060.00440.63093B 0.64200.65450.68500.69070.00570.75002A 0.00170.74830.7369…0.69420.68870.00550.64912B 0.6600.6780.69590.70310.00720.75003A 0.00000.75000.7386…0.69590.69180.00410.65083B 0.66000.67070.69590.70130.00540.75001A 0.00150.74850.7343…0.70790.70040.00750.67401B 0.6820.6960.70940.71920.00980.75002A 0.00150.74850.7391…0.70790.70290.00500.67402B 0.6820.6960.70940.71590.00650.75003A 0.00000.75000.7406…0.70940.70560.00380.67553B 0.68200.69080.70940.71430.00490.75002A 0.00130.74870.7406…0.71620.71180.00440.68922B 0.6960.7070.71750.72320.00570.75003A 0.00000.75000.7419…0.71750.71420.00330.69053B0.69600.70370.71750.72180.00430.75005/8-28/0.625-28UN 5/8-20/0.625-20UN 5/8-24/0.625-24UNEF 11/16-16/0.6875-16UN 11/16-20/0.6875-20UN5/8-32/0.625-32UN 11/16-12/0.6875-12UN 11/16-32/0.6875-32UN 3/4-10/0.750-10UNC 11/16-24/0.6875-24UNEF 11/16-28/0.6875-28UN 3/4-20/0.750-20UN3/4-12/0.750-12UN 3/4-16/0.750-16UNF最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級2A 0.00120.74880.7423…0.72560.72180.00380.70622B 0.7110.7200.72680.73180.00500.75003A 0.00000.75000.7435…0.72680.72390.00290.70743B 0.71100.71760.72680.73050.00370.75002A 0.00110.74890.7429…0.72860.72500.00360.71172B 0.7160.7240.72970.73440.00470.75003A 0.00000.75000.7440…0.72970.72700.00270.71283B 0.71600.72190.72970.73330.00360.75002A 0.00170.81080.7994…0.75670.75120.00550.71162B 0.7220.7400.75840.76560.00720.81253A 0.00000.81250.8011…0.75840.75430.00410.71333B 0.72200.73290.75840.76380.00540.81252A 0.00150.81100.8016…0.77040.76550.00490.73652B 0.7450.7590.77190.77820.00630.81253A 0.00000.81250.8031…0.77190.76830.00360.73803B 0.74500.75330.77190.77660.00470.81252A 0.00130.81120.8031…0.77870.77430.00440.75172B 0.7580.7700.78000.78570.00570.81253A 0.00000.81250.8044…0.78000.77670.00330.75303B 0.75800.76620.78000.78430.00430.81252A 0.00120.81130.8048…0.78810.78430.00380.76872B 0.7740.7820.78930.79430.00500.81253A 0.00000.81250.8060…0.78930.78640.00290.76993B 0.77400.78010.78930.79300.00370.81252A 0.00110.81140.8054…0.79110.78750.00360.77422B 0.7790.7860.79220.79690.00470.81253A 0.00000.81250.8065…0.79220.78950.00270.77533B 0.77900.78440.79220.79580.00360.81251A 0.00190.87310.8523…0.80090.79140.00950.74081B 0.7550.7780.80280.81510.01230.87502A 0.00190.87310.85920.85230.80090.79460.00630.74082B 0.7550.7780.80280.81100.00820.87503A 0.00000.87500.8611…0.80280.79810.00470.74273B 0.75500.76810.80280.80890.00610.87502A 0.00170.87330.8619…0.81920.81370.00550.77412B 0.7850.8030.82090.82810.00720.87503A 0.00000.87500.8636…0.82090.81680.00410.77583B 0.78500.79480.82090.82630.00540.87501A 0.00160.87340.8579…0.82700.81890.00810.78841B 0.7980.8140.82860.83920.01060.87502A 0.00160.87340.8631…0.82700.82160.00540.78842B 0.7980.8140.82860.83560.00700.87503A 0.00000.87500.8647…0.82860.82450.00410.79003B 0.79800.80680.82860.83390.00530.87502A 0.00150.87350.8641…0.83290.82800.00490.79002B 0.8070.8210.83440.84070.00630.87503A 0.00000.87500.8656…0.83440.83080.00360.80053B 0.80700.81580.83440.83910.00470.87502A 0.00130.87370.8656…0.84120.83680.00440.81422B 0.8210.8320.84250.84820.00570.87503A 0.00000.87500.8669…0.84250.83920.00330.81553B 0.82100.82870.84250.84680.00430.87502A 0.00120.87380.8673…0.85060.84680.00380.83122B 0.8360.8450.85180.85680.00500.87503A 0.00000.87500.8685…0.85180.84890.00290.83243B 0.83600.84260.85180.85550.00370.87502A 0.00110.87390.8679…0.85360.85000.00360.83672B 0.8410.8490.85470.85940.00470.87503A 0.00000.87500.8690…0.85470.85200.00270.83783B0.84100.84690.85470.85830.00360.87507/8-20/0.875-20UNEF 7/8-28/0.875-28UN 7/8-32/0.875-32UN7/8-12/0.875-12UN 7/8-14/0.875-14UNF 7/8-16/0.875-16UN 3/4-28/0.750-28UN 13/16-16/0.8125-16UN13/16-20/0.8125-20UNEF 3/4-32/0.750-32UN 13/16-12/0.8125-12UN 7/8-9/0.875-9UNC 13/16-28/0.8125-28UN 13/16-32/0.8125-32UN最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級2A 0.00170.93580.9244…0.88170.87600.00570.83662B 0.8470.8650.88340.89080.00740.93753A 0.00000.93750.9261…0.88340.87930.00410.83833B 0.84700.85750.88340.88890.00550.93752A 0.00150.93600.9266…0.89540.89040.00500.86152B 0.8700.8840.89690.90340.00650.93753A 0.00000.93750.9281…0.89690.89320.00370.86303B 0.87000.87830.89690.90180.00490.93752A 0.00140.93610.9280…0.90360.89910.00450.87662B 0.8830.8950.90500.91090.00590.93753A 0.00000.93750.9294…0.90500.90160.00340.87803B 0.88300.89120.90500.90940.00440.93752A 0.00120.93630.9298…0.91310.90910.00400.89372B 0.8990.9070.91430.91950.00520.93753A 0.00000.93750.9310…0.91430.91130.00300.89493B 0.89900.90510.91430.91820.00390.93752A 0.00110.93640.9304…0.91610.91230.00380.89922B 0.9040.9110.91720.92210.00490.93753A 0.00000.93750.9315…0.91720.91440.00280.90033B 0.90400.90940.91720.92090.00370.93751A 0.00200.99800.9755…0.91680.90670.01010.84921B 0.8650.8900.91880.93200.0132 1.00002A 0.00200.99800.98300.97550.91680.91000.00680.84922B 0.8650.8900.91880.92760.0088 1.00003A 0.0000 1.00000.9850…0.91880.91370.00510.85123B 0.86500.87970.91680.92540.0066 1.00001A 0.00180.99820.9810…0.94410.93530.00880.89901B 0.9100.9280.94590.95730.0114 1.00002A 0.00180.99820.9868…0.94410.93820.00590.89902B 0.9100.9280.94590.95350.0076 1.00003A 0.0000 1.00000.9886…0.94590.94150.00440.90083B 0.91000.91980.94590.95160.0057 1.00001A 0.00170.99830.9828…0.95190.94350.00840.91321B 0.9230.9380.95360.96450.0109 1.00002A 0.00170.99830.9880…0.95190.94630.00560.91322B 0.9230.9380.95360.96090.0073 1.00003A 0.0000 1.00000.9897…0.95360.94940.00420.91493B 0.92300.93160.95360.95900.0054 1.00002A 0.00150.99850.9891…0.95790.95290.00500.92402B 0.9320.9460.95940.96590.0065 1.00003A 0.0000 1.00000.9906…0.95940.95570.00370.92553B 0.93200.94080.95940.96430.0049 1.00002A 0.00140.99860.9905…0.96610.96160.00450.93912B 0.9460.9570.96750.97340.0059 1.00003A 0.0000 1.00000.9919…0.96750.96410.00340.94053B 0.94600.95370.96750.97190.0044 1.00002A 0.00120.99880.9923…0.97560.97160.00400.95622B 0.9610.9700.97680.98200.0052 1.00003A 0.0000 1.00000.9935…0.97680.97380.00300.95743B 0.96100.96760.97680.98070.0039 1.00002A 0.00110.99890.9929…0.97860.97480.00380.96172B 0.9660.9740.97970.98460.0049 1.00003A 0.0000 1.00000.9940…0.97970.97690.00280.96283B 0.96600.97190.97970.98340.0037 1.00002A 0.0020 1.06051.0455…0.97930.97250.00680.91172B 0.9270.9520.98130.99020.0089 1.06253A 0.0000 1.06251.0475…0.98130.97620.00510.91373B0.92700.94220.98130.98800.0067 1.06251-1/16-8/1.0625-8UN1-20/1.000-20UNEF1-28/1.000-28UN1-32/1.000-32UN1-12/1.000-12UNF 1-14/1.000-14UNS(5)1-16/1.000-16UN15/16-28/0.9375-28UN15/16-32/0.9375-32UN1-8/1.000-8UNC 15/16-12/0.9375-12UN15/16-16/0.9375-16UN15/16-20/0.9375-20UNEF最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級2A 0.0017 1.06081.0494… 1.00671.00100.00570.96162B 0.9720.990 1.00841.01580.0074 1.06253A 0.0000 1.06251.0511… 1.00841.00420.00420.96333B 0.97200.98231.00841.01390.0055 1.06252A 0.0015 1.06101.0516… 1.02041.01540.00500.98652B 0.995 1.009 1.02191.02840.0065 1.06253A 0.0000 1.06251.0531… 1.02191.01820.00370.98803B 0.99501.00331.02191.02680.0049 1.06252A 0.0014 1.06111.0524… 1.02501.02030.00470.99502B 1.002 1.015 1.02641.03260.0062 1.06253A 0.0000 1.06251.0538… 1.02641.02280.00360.99643B 1.00201.01051.02641.03100.0046 1.06252A 0.0014 1.06111.0530… 1.02861.02410.0045 1.00162B 1.008 1.020 1.03001.03590.0059 1.06253A 0.0000 1.06251.0544… 1.03001.02660.0034 1.00303B 1.00801.01621.03001.03440.0044 1.06252A 0.0012 1.06131.0548… 1.03811.03410.0040 1.01872B 1.024 1.032 1.03931.04450.0052 1.06253A 0.0000 1.06251.0560… 1.03931.03630.0030 1.01993B 1.02401.03011.03931.04320.0039 1.06251A 0.0022 1.12281.0982… 1.03001.0191 1.01090.95271B 0.9700.998 1.03221.04630.0141 1.12502A 0.0022 1.12281.10641.09821.03001.02280.00720.95272B 0.9700.998 1.03221.04160.0094 1.12503A 0.0000 1.12501.1086… 1.03221.02680.00540.95493B 0.97000.98751.03221.03930.0071 1.12502A 0.0021 1.12291.10791.10041.04171.03480.00690.97412B 0.990 1.015 1.04381.05280.0080 1.12503A 0.0000 1.12501.1100… 1.04381.03860.00520.97623B 0.99001.00471.04381.05050.0067 1.12501A 0.0018 1.12321.1060… 1.06911.06010.0090 1.02401B 1.035 1.053 1.07091.08260.0117 1.12502A 0.0018 1.12321.1118… 1.06911.06310.0060 1.02402B 1.035 1.053 1.07091.07870.0078 1.12503A 0.0000 1.12501.1136… 1.07091.06640.0045 1.02583B 1.03501.04481.07091.07680.0059 1.12502A 0.0015 1.12351.1141… 1.08291.07790.0050 1.04902B 1.057 1.071 1.08441.09090.0065 1.12503A 0.0000 1.12501.1156… 1.08441.08070.00370.05053B 1.05701.06581.08441.08930.0049 1.12502A 0.0014 1.12361.1149… 1.08751.08280.0047 1.05752B 1.065 1.078 1.08891.09510.0062 1.12503A 0.0000 1.12501.1163… 1.08891.08530.0036 1.05893B 1.06501.07301.08891.09350.0046 1.12502A 0.0014 1.12361.1155… 1.09111.08660.0045 1.06412B 1.071 1.082 1.09251.09840.0059 1.12503A 0.0000 1.12501.1169… 1.09251.08910.0034 1.06553B 1.07101.07871.09251.09690.0044 1.12502A 0.0012 1.12381.1173… 1.10061.09660.0040 1.08122B 1.086 1.095 1.10181.10700.0052 1.12503A 0.0000 1.12501.1185… 1.10181.09880.0030 1.08243B 1.08601.09261.10181.10570.0039 1.12502A 0.0021 1.18541.1704… 1.10421.09720.0070 1.03662B 1.052 1.077 1.10631.11540.0091 1.18753A 0.0000 1.18751.1725… 1.10631.10110.0052 1.03873B 1.05201.06721.10631.11310.0068 1.18752A 0.0017 1.18581.1744… 1.13171.12590.0058 1.08662B 1.097 1.115 1.13341.14090.0075 1.18753A 0.0000 1.18751.1761… 1.13341.12910.00431.08833B1.09701.10731.13341.13900.0056 1.18751-1/8-28/1.125-28UN 1-3/16-8/1.1875-8UN 1-3/16-12/1.1875-12UN1-1/8-16/1.125-16UN 1-1/8-18/1.125-18UNEF 1-1/8-20/1.125-20UN 1-1/8-7/1.125-7UNC 1-1/8-8/1.125-8UN 1-1/8-12/1.125-12UNF 1-1/16-18/1.0625-18UNEF 1-1/16-20/1.0625-20UN 1-1/16-28/1.0625-28UN 1-1/16-12/1.0625-12UN 1-1/16-16/1.0625-16UN最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級2A 0.0015 1.18601.1766… 1.14541.14030.0051 1.11152B 1.120 1.134 1.14691.15350.0066 1.18753A 0.0000 1.18751.1781… 1.14691.14310.0038 1.11303B 1.12001.12831.14691.15190.0050 1.18752A 0.0015 1.18601.1773… 1.14991.14500.0049 1.11992B 1.127 1.140 1.15141.15770.0063 1.18753A 0.0000 1.18751.1788… 1.15141.14780.0036 1.12143B 1.12701.13551.15141.15610.0047 1.18752A 0.0014 1.18611.1780… 1.15361.14890.0047 1.12662B 1.133 1.145 1.15501.16110.0061 1.18753A 0.0000 1.18751.1794… 1.15501.15150.0035 1.12803B 1.13301.14121.15501.15950.0045 1.18752A 0.0012 1.18631.1798… 1.16311.15900.0041 1.14372B 1.149 1.157 1.16431.16960.0053 1.18753A 0.0000 1.18751.1810… 1.16431.16120.0031 1.14493B 1.14901.15511.16431.16830.0040 1.18751A 0.0022 1.24781.2232… 1.15501.14390.0111 1.07771B 1.095 1.123 1.15721.17160.0144 1.25002A 0.0022 1.24781.23141.22321.15501.14760.0074 1.07772B 1.095 1.123 1.15721.16680.0096 1.25003A 0.0000 1.25001.2336… 1.15721.15170.0055 1.07993B 1.09501.11251.15721.16440.0072 1.25002A 0.0021 1.24791.23291.22541.16671.15970.0070 1.09912B 1.115 1.140 1.16881.17800.0092 1.25003A 0.0000 1.25001.2350… 1.16881.16350.0053 1.10123B 1.11501.12971.16881.17570.0069 1.25001A 0.0018 1.24821.2310… 1.19411.18490.0092 1.14901B 1.160 1.178 1.19591.20790.0120 1.25002A 0.0018 1.24821.2368… 1.19411.18790.0062 1.14902B 1.160 1.178 1.19591.20390.0080 1.25003A 0.0000 1.25001.2386… 1.19591.19130.0046 1.15083B 1.16001.16981.19591.20190.0060 1.25002A 0.0015 1.24851.2391… 1.20791.20280.0051 1.17402B 1.182 1.196 1.20941.21600.0066 1.25003A 0.0000 1.25001.2406… 1.20941.20560.0038 1.17553B 1.18201.19081.20941.21440.0050 1.25002A 0.0015 1.24851.2398… 1.21241.20750.0049 1.18242B 1.190 1.203 1.21391.22020.0063 1.25003A 0.0000 1.25001.2413… 1.21391.21030.0036 1.18393B 1.19001.19801.21391.21860.0047 1.25002A 0.0014 1.24861.2405… 1.21611.21140.0047 1.18912B 1.196 1.207 1.21751.22360.0061 1.25003A 0.0000 1.25001.2419… 1.21751.21400.0035 1.19053B 1.19601.20371.21751.22200.0045 1.25002A 0.0012 1.24881.2423… 1.22561.22150.0041 1.20622B 1.211 1.220 1.22681.23210.0053 1.25003A 0.0000 1.25001.2435… 1.22681.22370.0031 1.20743B 1.21101.21761.22681.23080.0040 1.25002A 0.0021 1.31041.2954… 1.22921.22210.0071 1.16162B 1.177 1.202 1.23131.24050.0092 1.31253A 0.0000 1.31251.2975… 1.23131.22600.0053 1.16373B 1.17701.19221.23131.23820.0069 1.31252A 0.0017 1.31081.2994… 1.25671.25090.0058 1.21162B 1.222 1.240 1.25841.26590.0075 1.31253A 0.0000 1.31251.3011… 1.25841.25410.0043 1.21333B 1.22201.23231.25841.26400.0056 1.31252A 0.0015 1.31101.3016… 1.27041.26530.0051 1.23652B 1.245 1.259 1.27191.27850.0066 1.31253A 0.0000 1.31251.3031… 1.27191.26810.00381.23803B1.24501.25331.27191.27690.0050 1.31251-1/4-20/1.250-20UN 1-1/4-28/1.250-28UN 1-5/16-16/1.3125-16UN1-5/16-8/1.3125-8UN 1-5/16-12/1.3125-12UN 1-1/4-12/1.250-12UNF 1-1/4-16/1.250-16UN 1-1/4-18/1.250-18UNEF 1-3/16-28/1.1875-28UN 1-1/4-7/1.250-7UNC 1-1/4-8/1.250-8UN 1-3/16-16/1.1875-16UN1-3/16-18/1.1875-18UNEF 1-3/16-20/1.1875-20UN最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級2A 0.0015 1.31101.3023… 1.27491.27000.0049 1.24492B 1.252 1.265 1.27641.28270.0063 1.31253A 0.0000 1.31251.3038… 1.27641.27280.0036 1.24643B 1.25201.26051.27641.28110.0047 1.31252A 0.0014 1.31111.3030… 1.27861.27390.0047 1.25162B 1.258 1.270 1.28001.28610.0061 1.31253A 0.0000 1.31251.3044… 1.28001.27650.0035 1.25303B 1.25801.26621.28001.28450.0045 1.31252A 0.0012 1.31131.3048… 1.28811.28400.0041 1.26872B 1.274 1.282 1.28931.29460.0053 1.31253A 0.0000 1.31251.3060… 1.28931.28620.0031 1.26993B 1.27401.28011.28931.29330.0040 1.31251A 0.0024 1.37261.3453… 1.26431.25230.0120 1.17421B 1.195 1.225 1.26671.28220.0155 1.37502A 0.0024 1.37261.35441.34531.26431.25630.0080 1.17422B 1.195 1.225 1.26671.27710.0104 1.37503A 0.0000 1.37501.3568… 1.26671.26070.0060 1.17663B 1.19501.21461.26671.27450.0078 1.37502A 0.0022 1.37281.35781.35031.29161.28440.0072 1.22402B 1.240 1.265 1.29381.30310.0093 1.37503A 0.0000 1.37501.3600… 1.29381.28840.0054 1.22623B 1.24001.25471.29381.30080.0070 1.37501A 0.0019 1.37311.3559… 1.31901.30960.0094 1.27391B 1.285 1.303 1.32091.33320.0123 1.37502A 0.0019 1.37311.3617… 1.31901.31270.0063 1.27392B 1.285 1.303 1.32091.32910.0082 1.37503A 0.0000 1.37501.3636… 1.32091.31620.0047 1.27583B 1.28501.29481.32091.32700.0061 1.37502A 0.0015 1.37351.3641… 1.33291.32780.0051 1.29902B 1.307 1.321 1.33441.34100.0066 1.37503A 0.0000 1.37501.3656… 1.33441.33060.0038 1.30053B 1.30701.31581.33441.33940.0050 1.37502A 0.0015 1.37351.3648… 1.33741.33250.0049 1.30742B 1.315 1.328 1.33891.34520.0063 1.37503A 0.0000 1.37501.3663… 1.33891.33530.0036 1.30893B 1.31501.32301.33891.34360.0047 1.37502A 0.0014 1.37361.3655… 1.34111.33640.0047 1.31412B 1.321 1.332 1.34251.34860.0061 1.37503A 0.0000 1.37501.3669… 1.34251.33900.0035 1.31553B 1.32101.32871.34251.34700.0045 1.37502A 0.0012 1.37381.3673… 1.35061.34650.0041 1.33122B 1.336 1.345 1.35181.35710.0053 1.37503A 0.0000 1.37501.3685… 1.35181.34870.0031 1.33243B 1.33601.34261.35181.35580.0040 1.37502A 0.0024 1.43511.4169… 1.32681.31880.0080 1.23672B 1.257 1.288 1.32921.33960.0104 1.43753A 0.0000 1.43751.4193… 1.32921.32320.0060 1.23913B 1.25701.27711.32921.33700.0078 1.43752A 0.0022 1.43531.4203… 1.35411.34690.0072 1.28652B 1.302 1.327 1.35631.36570.0094 1.43753A 0.0000 1.43751.4225… 1.35631.35090.0054 1.28873B 1.30201.31721.35631.36340.0071 1.43752A 0.0018 1.43571.4243… 1.38161.37570.0059 1.33652B 1.347 1.365 1.38341.39100.0076 1.43753A 0.0000 1.43751.4261… 1.38341.37900.0044 1.33833B 1.34701.35731.38341.38910.0057 1.43752A 0.0016 1.43591.4265… 1.39531.39010.0052 1.36142B 1.370 1.384 1.39691.40370.0068 1.43753A 0.0000 1.43751.4281… 1.39691.39300.00391.36303B1.37001.37831.39691.40200.0051 1.43751-7/16-12/1.4375-12UN 1-7/16-16/1.4375-16UN1-7/16-8/1.4375-8UN 1-3/8-18/1.375-18UNEF 1-3/8-20/1.375-20UN 1-7/16-6/1.4375-6UN 1-3/8-28/1.375-28UN 1-3/8-12/1.375-12UNF 1-3/8-16/1.375-16UN 1-3/8-6/1.375-6UNC 1-3/8-8/1.375-8UN 1-5/16-28/1.3125-28UN 1-5/16-18/1.3125-18UNEF 1-5/16-20/1.3125-20UN。
美制统一螺纹表
5/16 0.3125
第 1 页，共 45 页
美制标准系列统一螺
公称 基本大经 牙数 系列 直径 D，d(in) n 代号 5/16 0.3125 5/16 0.3125 5/16 0.3125 5/16 0.3125 3/8 3/8 3/8 3/8 3/8 0.3750 0.3750 0.3750 0.3750 0.3750 20 24 28 32 16 20 24 28 32 14 16 20 28 32 13 16 20 28 32 12 16 18 20 24 UN UNF UN UNEF UNC UN UNF UN UNEF UNC UN UNF UNEF UN UNC UN UNF UNEF UN UNC UN UNF UN UNEF 基本中经 D2，d2 0.2800 0.2854 0.2893 0.2922 0.3344 0.3425 0.3479 0.3518 0.3547 0.3911 0.3969 0.4050 0.4143 0.4172 0.4500 0.4594 0.4675 0.4768 0.4797 0.5084 0.5219 0.5264 0.5300 0.5354 UNR外螺纹设 内螺纹基本小 计牙型小径 径D1 d3(参考) 0.2584 0.2674 0.2738 0.2787 0.3073 0.3209 0.3299 0.3363 0.3412 0.3602 0.3698 0.3834 0.3988 0.4037 0.4167 0.4323 0.4459 0.4613 0.4662 0.4723 0.4948 0.5024 0.5084 0.5174 0.2512 0.2614 0.2687 0.2742 0.2983 0.3137 0.3239 0.3312 0.3367 0.3499 0.3608 0.3762 0.3937 0.3992 0.4056 0.4233 0.4387 0.4562 0.4617 0.4603 0.4858 0.4943 0.5012 0.5114 公制对照表(mm) 基本大经 D，d 7.9375 7.9375 7.9375 7.9375 9.5250 9.5250 9.5250 9.5250 9.5250 11.1125 11.1125 11.1125 11.1125 11.1125 12.7000 12.7000 12.7000 12.7000 12.7000 14.2875 14.2875 14.2875 14.2875 14.2875 (内)小径D1 6.5627 6.7918 6.9555 7.0782 7.8065 8.1502 8.3793 8.5430 8.6657 9.1485 9.3940 9.7377 10.1305 10.2532 10.5849 10.9815 11.3252 11.7180 11.8407 11.9961 12.5690 12.7599 12.9127 13.1418 (外)小径d3 6.5627 6.7918 6.9555 7.0782 7.8065 8.1502 8.3793 8.5430 8.6657 9.1485 9.3940 9.7377 10.1305 10.2532 10.5849 10.9815 11.3252 11.7180 11.8407 11.9961 12.5690 12.7599 12.9127 13.1418 螺距P 1.2700 1.0583 0.9071 0.7938 1.5875 1.2700 1.0583 0.9071 0.7938 1.8143 1.5875 1.2700 0.9071 0.7938 1.9538 1.5875 1.2700 0.9071 0.7938 2.1167 1.5875 1.4111 1.2700 1.0583 中经公差 容隙 2A 0.004060 0.003660 0.003495 0.003301 0.004363 0.004124 0.003804 0.003559 0.003365 0.004713 0.004626 0.004167 0.003616 0.003422 0.004965 0.004678 0.004288 0.003668 0.003474 0.005225 0.004725 0.004547 0.004280 0.003960 es 1A和2A 0.001218 0.001098 0.001049 0.000990 0.001309 0.001237 0.001141 0.001068 0.001010 0.001414 0.001388 0.001250 0.001085 0.001027 0.001490 0.001403 0.001286 0.001100 0.001042 0.001568 0.001418 0.001364 0.001284 0.001188
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美制外螺纹（2A）常用规格极限尺寸表（粗牙）公称尺寸和每英寸牙数螺纹系列代号大径极限中径极限小径max螺胚直径最小最大最小最大最小最大8-32UNC 0.1571 0.1631 0.1399 0.1428 0.12483.58 3.61(0.164-32) 3.9903 4.1427 3.5535 3.6271 3.169910-24 0.1818 0.1890 0.1586 0.1619 0.13794.07 4.10 (0.190-24) 4.6177 4.8006 4.0284 4.1123 3.502712-24 0.2078 0.2150 0.1845 0.1879 0.16394.72 4.75 (0.216-24)5.2781 5.4610 4.6863 4.7727 4.16311/4-20 0.2408 0.2489 0.2127 0.2164 0.18765.45 5.48 (0.250-20)6.1163 6.3221 5.4026 5.4966 4.76505/16-18 0.3026 0.3113 0.2712 0.2752 0.24316.94 6.98 (0.3175-18)7.6860 7.9070 6.8885 6.9901 6.17473/8-16 0.3643 0.3737 0.3287 0.3331 0.29708.40 8.44 (0.375-16) 9.2532 9.4920 8.3490 8.4607 7.54387/16-14 0.4258 0.4361 0.3850 0.3897 0.34859.83 9.87 (0.4375-14) 10.8153 11.0769 9.7790 9.8984 8.85191/2-13 0.4876 0.4985 0.4435 0.4485 0.404111.34 11.38 (0.50-13) 12.3850 12.6619 11.2649 11.3919 10.26419/16-12 0.5495 0.5609 0.5016 0.5068 0.458712.80 12.84 (0.5625-12) 13.9573 14.2469 12.7406 12.8727 11.65105/8-11 0.6113 0.6234 0.5589 0.5644 0.511914.27 14.32 (0.625-11) 15.5270 15.8344 14.1961 14.3358 13.00233/4-10 0.7353 0.7482 0.6773 0.6832 0.625517.28 17.33 (0.750-10) 18.6766 19.0043 17.2034 17.3533 15.88777/8-9 0.8592 0.8731 0.7946 0.8009 0.736820.27 20.32 (0.875-9) 21.8237 22.1767 20.1828 20.3429 18.71471"-8 0.9830 0.9980 0.9100 0.9168 0.844623.22 23.27 (1.000-8) 24.9682 25.3492 23.1140 23.2867 21.45281.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
2.标记示例：10-24UNC-2A(或0.190-24UNC-2A)、3/8-16UNC-2A(或0.375-16UNC-2A) （注：表中上行斜体数值单位为英寸，下行为毫米）美制外螺纹（2A）常用规格极限尺寸表（细牙）公称尺寸和每英寸牙数螺纹系列代号大径极限中径极限小径max螺胚直径最小最大最小最大最小最大8-36 UNF 0.1577 0.1632 0.1424 0.1452 0.1291 3.65 3.67(0.164-36) 4.0056 4.1453 3.6170 3.6881 3.279110-32 0.1831 0.1891 0.1658 0.1688 0.15084.24 4.27 (0.190-32) 4.6507 4.8031 4.2113 4.2875 3.830312-28 0.2085 0.2150 0.1886 0.1918 0.17124.82 4.85 (0.216-28)5.2959 5.4610 4.7904 4.8717 4.34851/4-28 0.2425 0.2490 0.2225 0.2258 0.20525.69 5.71 (0.250-28)6.1595 6.3246 5.6515 5.7353 5.21215/16-24 0.3042 0.3114 0.2806 0.2843 0.26037.17 7.20 (0.3175-24) 7.7267 7.9096 7.1272 7.2212 6.61163/8-24 0.3667 0.3739 0.3430 0.3468 0.32288.75 8.78 (0.375-24) 9.3142 9.4971 8.7122 8.8087 8.19917/16-20 0.4281 0.4362 0.3995 0.4037 0.374910.19 10.23 (0.4375-20) 10.8737 11.0795 10.1473 10.2540 9.52251/2-20 0.4906 0.4987 0.4619 0.4662 0.437411.78 11.82 (0.50-20) 12.4612 12.6670 11.7323 11.8415 11.11009/16-18 0.5524 0.5611 0.5205 0.5250 0.492913.27 13.31 (0.5625-18) 14.0310 14.2519 13.2207 13.3350 12.51975/8-18 0.6149 0.6236 0.5828 0.5875 0.555414.85 14.89 (0.625-18) 15.6185 15.8394 14.8031 14.9225 14.10723/4-16 0.7391 0.7485 0.7029 0.7079 0.671817.91 17.95 (0.750-16) 18.7731 19.0119 17.8537 17.9807 17.06377/8-14 0.8631 0.8734 0.8216 0.8270 0.785820.93 20.97 (0.875-14) 21.9227 22.1844 20.8686 21.0058 19.95931"-12 0.9868 0.9982 0.9382 0.9441 0.896023.90 23.95 (1.000-12) 25.0647 25.3543 23.8303 23.9801 22.75841.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
2.标记示例：10-32UNF-2A(或0.190-32UNF-2A)、3/8-24UNF-2A(或0.375-24UNF-2A)美制内螺纹（2B）常用规格极限尺寸表（粗牙）公称尺寸和每英寸牙数螺纹系列代号小径极限中径极限大径min底孔直径最小最大最小最大最小最大8-32UNC 0.1300 0.1390 0.1437 0.1475 0.16403.40 3.50(0.164-32) 3.3020 3.5306 3.6500 3.7465 4.165610-24 0.1450 0.1560 0.1629 0.1672 0.19003.75 3.90 (0.190-24) 3.6830 3.96244.1377 4.2469 4.826012-24 0.1710 0.1810 0.1889 0.1933 0.21604.40 4.55 (0.216-24) 4.3434 4.5974 4.7981 4.90985.48641/4-20 0.1960 0.2070 0.2175 0.2224 0.25005.05 5.20 (0.250-20) 4.9784 5.2578 5.5245 5.64906.35005/16-18 0.2520 0.2650 0.2764 0.2817 0.31256.45 6.60 (0.3175-18) 6.4008 6.73107.0206 7.1552 7.93753/8-16 0.3070 0.3210 0.3344 0.3401 0.37507.85 8.00 (0.375-16) 7.7978 8.1534 8.4938 8.6385 9.52507/16-14 0.3600 0.3760 0.3911 0.3972 0.43759.20 9.40 (0.4375-14) 9.1440 9.5504 9.9339 10.0889 11.11251/2-13 0.4170 0.4340 0.4500 0.4565 0.500010.65 10.90 (0.50-13) 10.5918 11.0236 11.4300 11.5951 12.70009/16-12 0.4720 0.4900 0.5084 0.5152 0.562512.05 12.30 (0.5625-12) 11.9888 12.4460 12.9134 13.0861 14.28755/8-11 0.5270 0.5460 0.5660 0.5732 0.625013.45 13.70 (0.625-11) 13.3858 13.8684 14.3764 14.5593 15.87503/4-10 0.6420 0.6630 0.6850 0.6927 0.750016.40 16.70 (0.750-10) 16.3068 16.8402 17.3990 17.5946 19.05007/8-9 0.7550 0.7780 0.8028 0.8110 0.875019.30 19.60 (0.875-9) 19.1770 19.7612 20.3911 20.5994 22.22501"-8 0.8650 0.8900 0.9188 0.9276 1.000022.10 22.40 (1.000-8) 21.9710 22.6060 23.3375 23.5610 25.40001.底孔直径指攻丝前钻孔直径，铸铁、黄铜等较软料取小值，钢、青铜等较硬料取大值。
2.标记示例：10-24UNC-2B(或0.190-24UNC-2B)、3/8-16UNC-2B(或0.375-16UNC-2B)美制内螺纹（2B）常用规格极限尺寸表（细牙）公称尺寸和每英寸牙数螺纹系列代号小径极限中径极限大径min底孔直径最小最大最小最大最小最大8-36UNF 0.1340 0.1420 0.1460 0.1496 0.16403.45 3.67(0.164-36) 3.4036 3.6068 3.7084 3.7998 4.165610-32 0.1560 0.1640 0.1697 0.1736 0.19004.00 4.27 (0.190-32) 3.9624 4.1656 4.3104 4.4094 4.826012-28 0.1770 0.1860 0.1928 0.1970 0.21604.55 4.85 (0.216-28) 4.4958 4.7244 4.89715.0038 5.48641/4-28 0.2110 0.2200 0.2268 0.2311 0.2500 5.40 5.71(0.250-28) 5.3594 5.5880 5.7607 5.8699 6.35005/16-24 0.2670 0.2770 0.2854 0.2902 0.31256.857.20 (0.3175-24) 6.7818 7.0358 7.2492 7.3711 7.93753/8-24 0.3300 0.3400 0.3479 0.3528 0.37508.45 8.78 (0.375-24) 8.3820 8.6360 8.8367 8.9611 9.52507/16-20 0.3830 0.3950 0.4050 0.4104 0.43759.85 10.23 (0.4375-20) 9.7282 10.0330 10.2870 10.4242 11.11251/2-20 0.4460 0.4570 0.4675 0.4731 0.500011.40 11.82 (0.50-20) 11.3284 11.6078 11.8745 12.0167 12.70009/16-18 0.5020 0.5150 0.5264 0.5323 0.562512.85 13.31 (0.5625-18) 12.7508 13.0810 13.3706 13.5204 14.28755/8-18 0.5650 0.5780 0.5889 0.5949 0.625014.45 14.89 (0.625-18) 14.3510 14.6812 14.9581 15.1105 15.87503/4-16 0.6820 0.6960 0.7094 0.7159 0.750017.40 17.95 (0.750-16) 17.3228 17.6784 18.0188 18.1839 19.05007/8-14 0.7980 0.8140 0.8286 0.8356 0.875020.35 20.97 (0.875-14) 20.2692 20.6756 21.0464 21.2242 22.22501"-12 0.9100 0.9280 0.9459 0.9535 1.000023.90 23.95 (1.000-12) 23.1140 23.5712 24.0259 24.2189 25.40001.底孔直径指攻丝前钻孔直径，铸铁、黄铜等较软料取小值，钢、青铜等较硬料取大值。