名义尺寸BA
牙型代号
No. 14No. 13No. 12No. 11No. 10No. 9No. 8No. 7No. 6No. 5No. 4No. 3No. 2No. 1No. 0
BABABABABABABABABABABABABABABA
大径mmd=D11.21.31.51.71.92.22.52.83.23.64.14.75.36
螺距mmp0.230.250.280.310.350.390.430.480.530.590.660.730.810.91
每英寸牙
数
tpi110.4101.690.7181.9372.5765.1259.0752.9247.9243.0538.4834.7931.3528.2225.4
中径mmd2=D20.861.051.131.3151.491.6651.942.212.482.8453.2053.664.2154.765.4
小径外螺纹d30.720.90.961.131.281.431.681.922.162.492.813.223.734.224.8
牙型高H10.140.150.170.1850.210.2350.260.290.320.3550.3950.440.4850.540.6
底孔直径mm0.750.9511.21.351.51.822.32.62.953.43.94.45
权威55°圆锥管螺纹型式和尺寸
（2006-03-13 14:38:47 ）
基本尺寸
英寸
螺纹代号R 1/16R 1/8R 1/4R 3/8R 1/2R 3/4R 1R 1 1/4R 1 1/2R 2R 2 1/2R 3R 4R 5R 6
1/16＂1/8＂1/4＂3/8＂1/2＂3/4＂1＂1 1/4＂1 1/2＂2＂2 1/2＂3＂4＂5＂6＂
大径mmd=D7.7239.72813.15716.66220.95526.44133.24941.9147.80359.61475.18487.884113.03138.43163.83
螺距mmp0.9070.9071.3371.3371.8141.8142.3092.3092.3092.3092.3092.3092.3092.3092.309
每英寸牙
数tpi
282819191414111111111111111111
中径mmd2=D27.1429.14712.30115.80619.79325.27931.7740.43146.32458.13573.70586.405111.551136.951162.351
小径外螺纹d36.5618.56611.44514.9518.63124.11730.29138.95244.84556.65672.22684.926110.072135.472160.872
牙型高度H10.5810.5810.8560.8561.1621.1621.4791.4791.4791.4791.4791.4791.4791.4791.479
圆弧尺寸
r0.1250.1250.1840.1840.2490.2490.3170.3170.3170.3170.3170.3170.3170.3170.317
底孔尺寸mm6.48.411.214.7518.2523.753038.544.5567185.5110.5136161.5
权威制惠氏螺纹的型式尺寸
英制普通螺纹 (惠氏螺纹) -- 粗牙 (BSW)
每英寸牙
名义尺寸大径螺距数中径小径牙型高底孔直径Ww
mmmmtpi
mm外螺纹H1
mm
牙型代号
d=Dpd2=D2d31/16＂BSW1.5870.423601.3151.050.271.153/32＂BSW2.3810.529482.0411.7030.3381.91/8＂BSW3.1750.635402.7682.3620.4062.55/32＂BSW3.9690.793323.4592.9520.5073.23/16＂BSW4.7621.058244.0843.4070.6773.77/32＂BSW5.5561.058244.8784.2010.6774.51/4＂BSW6.351.27205.5374.7240.8135.15/16＂BSW7.9381.411187.0346.1310.9046.53/8＂BSW9.5251.588168.5097.4921.0177.97/16＂BSW11.1131.814149.9518.7891.1629.21/2＂BSW12.72.1171211.3459.991.35510.45/8＂BSW15.8762.3091114.39712.9181.47913.43/4＂BSW19.0512.541017.42415.7981.62716.257/8＂BSW22.2262.822920.41918.6111.80719.251＂BSW25.43.175823.36821.3352.033221 1/8＂BSW28.5763.629726.25323.9292.32424.51 1/4＂BSW31.7513.629729.42827.1042.32427.251 3/8＂BSW34.9264.233632.21529.5052.71130.251 1/2＂BSW38.14.233635.39132.682.71133.51 5/8＂BSW41.2775.08538.02434.7713.25335.51 3/4＂BSW44.4525.08541.19937.9463.25338.51 7/8＂BSW47.6275.6454 1/244.01240.3983.61441.252＂BSW50.8025.6454 1/247.18743.5733.61444.52 1/4＂BSW57.1526.35453.08649.024.066502 1/2＂BSW63.5026.35459.43655.374.066562 3/4＂BSW69.8537.2573 1/265.20560.5584.64761.53＂BSW76.2037.2573 1/271.55666.9094.647683 1/4＂BSW82.5537.8163 1/477.54872.5445.00573.753 1/2＂BSW88.9037.8163 1/483.89978.8945.005803 3/4＂BSW95.2548.467389.83284.415.42285.54＂BSW101.6048.467396.18290.765.422924 1/4＂BSW107.9548.8352 7/8102.29796.6395.657984 1/2＂BSW114.3048.8352 7/8108.647102.995.657104.24 3/4＂BSW120.6659.2372 3/4114.74108.6255.9151105＂BSW127.0059.2372 3/4121.09115.1765.915116.55 1/4＂BSW133.3559.6772 5/8127.159120.9636.196122.55 1/2＂
BSW
139.705
9.677
2 5/8133.509
127.313
6.196
128.5
5 3/4＂6＂BSWBSW146.055152.40610.1610.162 1/22 1/2139.549145.9133.043139.3946.5066.506134.5141
权威英制普通螺纹 -- 细牙 -- BSF
权威英制普通螺纹 (惠氏螺纹) -- 细牙 (BSW)
名义尺寸BSF
牙型代号
3/167/321/49/325/163/87/161/29/165/811/163/413/167/81.001 1/81 1/41 3/81 1/21 5/81 3/422 1/42 1/22 3/433 1/43 1/23 3/444 1/4
BSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSFBSF
大径mmd=D4.7635.5566.357.1427.9389.52511.11312.714.28815.87517.46319.0520.63822.22525.428.57531.7534.92538.141.27544.4550.857.1563.569.8576.282.5588.995.25101.6107.95
螺距mmp0.7940.9070.9770.9771.1561.271.4111.5881.5881.8141.8142.1172.1172.3092.542.8222.8223.1753.1753.1753.6293.6294.2344.2344.2345.085.085.6455.6455.6456.35
3228262622201816161414121211109988877666554 1/24 1/24 1/24每英寸牙
数
tpi
中径mmd2=D24.2554.9755.7256.5187.1998.71210.20911.68413.27214.71216.317.69319.28120.74723.77426.76929.94432.89336.06839.24342.12648.47654.4460.7967.1472.94679.29685.28591.63597.985103.886
小径外螺纹d33.7474.3945.15.8936.4597.8999.30410.66812.25613.54915.13716.33617.92419.26922.14824.96328.13830.86134.03637.21139.80246.15251.7358.0864.4369.69276.04281.6788.0294.3799.822
0.5080.5810.6250.6250.7390.8130.9041.0171.0171.1621.1621.3551.3551.4791.6271.8071.8072.0332.0332.0332.3242.3242.7112.7112.7113.2533.2533.6143.6143.6144.066
44.65.36.16.88.39.711.112.71415.516.7518.2519.7522.7526.528.7531.534.53840.5475359-------牙型高H1
底孔直径mm
权威55°圆柱管螺纹的型式和尺寸
权威British Pipe Thread (大径
螺纹代号G 1/8G 1/4G 3/8G 1/2G 5/8G 3/4G 7/8G 1G 1 1/8G 1 1/4G 1 3/8G 1 1/2G 1 3/4G 2G 2 1/4G 2 1/2G 2 3/4G 3G 3 1/4G 3 1/2G 3 3/4G 4G 4 1/2G 5G 5 1/2G 6
基本尺寸1/8＂1/4＂3/8＂1/2＂5/8＂3/4＂7/8＂1＂1 1/8＂1 1/4＂1 3/8＂1 1/2＂1 3/4＂2＂2 1/4＂2 1/2＂2 3/4＂3＂3 1/4＂3 1/2＂3 3/4＂4＂4 1/2＂5＂5 1/2＂6＂
mmd=D9.72813.15716.66220.95522.91126.44130.20133.24937.89741.9144.32347.80353.74659.61465.7175.18481.53487.88493.98100.33106.68113.03125.73138.43151.13163.83
螺距mmp0.9071.3371.3371.8141.8141.8141.8142.3092.3092.3092.3092.3092.3092.3092.3092.3092.3092.3092.3092.3092.3092.3092.3092.3092.3092.309
惠氏管螺纹) -- 圆柱 (BSPP/BSPF)
中径mmd2=D29.14712.30115.80619.79321.74925.27929.03931.7736.41840.43142.84446.32452.26758.13564.23173.70580.05586.40592.50198.351105.201111.55124.251136.951149.651162.351
小径外螺纹d38.56611.44514.9518.63120.58724.11727.87730.29134.93938.95241.36544.84550.78856.65662.75272.22678.57684.92691.02297.372103.722110.072122.772135.472148.172160.872
牙型高度H10.5810.8560.8561.1621.1621.1621.1621.4791.4791.4791.4791.4791.4791.4791.4791.4791.4791.4791.4791.4791.4791.4791.4791.4791.4791.479
底孔尺寸mm8.711.6151920.7524.52830.53539.541.54551576372.57985.59197.75104110.5123136148.5161.5
每英寸牙
数
tpi2819191414141411111111111111111111111111111111111111
RC2英寸锥管螺纹，每英寸
R等于1/32乘以长度1/32意思是，锥螺纹的锥度是长度意思是：定位点加有效长度
11牙，螺距=25.4/11即2.309，牙高（深）=2.309×0.64即1.479，锥度是固定的即1：16
1：16 ，单边就是1：32
比如我定位3.0，有效长度是12.0R=1/32 X（3+12）=0.46875
1、密封管螺纹（R）
英制密封管螺纹的基本尺寸及其公差 配合方式
英制密封管螺纹有两种配合方式：圆柱内螺纹与圆锥外螺纹组成
“柱/锥”配合；圆锥内螺纹与圆锥外螺纹组成
“锥/锥”配合.
欧洲国家主要采用“柱/锥”配合螺纹；而欧洲以外国家则主要采用
英制密封管螺纹量规标准（
“柱/锥”配合螺纹.两种螺纹的检验量规存在一定不同；目前的ISO
ISO 7-2：2000）是按“柱/锥”配合体系设计的.
编辑本段密封管螺纹的标记
英制密封管螺纹的完整标记由螺纹特征代号、螺纹尺寸代号和旋向代号组成 英制密封圆柱内螺纹的特征代号为： 英制密封圆锥内螺纹的特征代号为： 英制密封圆锥外螺纹的特征代号为：
RP；RC；
R1（与英制密封圆柱内螺纹配合使用）；
.
R2（与英制密封圆锥内螺纹配合使用）； 左旋螺纹的旋向代号为 对密封管螺纹，利用 2、非密封管螺纹
英制非密封管的基本尺寸及其极限偏差 标记:
英制非密封管螺纹的完整标记由螺纹特征代号，螺纹尺寸代号，中径公差等级代号和旋向代号组成 英制非密封圆柱螺纹的特征代号为：
G
A和B.
.
LH；右旋螺纹的旋向代号省略不标
.
RP/R1，RC/R2分别表示“柱/锥” 和“锥/锥”螺纹副.
对英制非密封圆柱内螺纹，其中径公差等级代号省略不标；而英制非密封圆柱外螺纹的中径公尺等级代号分别为 左旋螺纹的旋向代号为
LH；右旋螺纹的旋向代号省略不标
.
.
当表示英制非密封管螺纹的螺纹副时，仅标注外螺纹的标记代号 示例：
尺寸代号为2的右旋，非密封圆柱内螺纹：
G2
G3AG4 B-LH
尺寸代号为3的A级，右旋，非密封圆柱外螺纹： 尺寸代号为4的B级，左旋，非密封圆柱外螺纹： 尺寸代号为2的右旋，非密封圆柱内螺纹与 加工内孔螺纹的是管螺纹丝锥 其他：
55°圆锥管螺纹的转化
55°圆锥管螺纹，是指螺纹的牙型角为 中国英国法国日本 iso 代号 ZG R（外） G PT R R(外螺纹) Rc（内） R R Rc 60°圆锥管螺纹的转化
A级圆柱外螺纹组成的螺纹副：G2A
加工外螺纹的有板牙。
55°、螺纹具有1：16的锥度。该系列螺纹在世界上应用广泛，它的代号，各国规定不同。
60°圆锥管螺纹是指牙型角为
60°、螺纹锥度为1：16的管螺纹，此系列螺纹在我国机床行业和美国、前苏联应用。它的代号，我国
过去规定为K，后来规定为Z，现在改为NPT.
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