范文一:英制螺纹对照表
National Pipe Thread美国管螺纹 国家螺纹管标准 ANSI B1.20.1
Characteristics of NPT (also known as ANSI/ASME B1.20.1 Pipe Threads, General Purpose):
该标准规定:
tapered thread 1o 47' 锥形螺纹 1度47分
truncation of roots and crests are flat 顶部和根部的截断面是平的 60o thread angle 60度的螺纹断面角
pitch is measured in threads per inch 单位罗纹数以每英寸计算
Note! Pipe sizes do not refer to any physical dimensions. The outside diameter of a pipe or fitting must be measured and compared to a table for size identification. A 3/4“ NPT pipe thread has an outside diameter - OD - of 1.050 inches.
备注:管的尺寸不是指物理容积。管的外部直径和属性必须以下面这个表格来确定。例如:一个标准为3/4” NPT的管外部直径为1.050英寸。
Each thread size has a defined number of threads per inch - TPI, or pitch. The 3/4“ NPT pipe thread has 14 threads per inch. Both the TPI and OD of the thread are required for positive identification of thread size because more than one size have the same TPI.
每种罗纹管每英寸有固定的罗纹数(单位的罗纹数)。TPI 或pitch 就是单位的罗纹数。 3/4” NPT 标准的罗纹管每英寸有14条罗纹。由于不同的标准中可能会出现同样的单位罗纹数。因此每个标准必须有固定的单位的罗纹数(TPI )和固定的外部直径(OD )。
NPT - American Standard Pipe Taper Thread 1)
Pipe Size 管的尺寸
(inches ) Threads per Inch 单位罗纹数
TPI - pitch Outside Diameter 外部直径
OD
(inches )
管的尺寸 单位罗纹数 外部直径
1/16“ 27 0.313” 7.95 1/8“ 27 0.405” 10.28 1/4“ 18 0.540” 13.71 3/8“ 18 0.675” 17.14 1/2“ 14 0.840” 21.33 3/4“ 14 1.050” 26.67 1“ 11-1/2 1.315” 33.40 1-1/4“ 11-1/2 1.660” 42.16 1-1/2“ 11-1/2 1.900” 48.26 2“ 11-1/2 2.375”
2-1/2“ 8 2.875”
3“ 8 3.500”
3-1/2“ 8 4.000”
4“ 8 4.500”
5“ 8 5.563”
6“ 8 6.625”
8“ 8 8.625”
10“ 8 10.750”
12“ 8 12.750”
14“ 8 14.000”
16“ 8 16.000”
1) The taper is 1/16 inch in an inch, which is the same as 3/4 inch in a foot (angle 1o 47‘)
1) 锥度为每英寸1/16英寸和每英尺3/4英寸是一样的。
NPT threads are not interchangeable with NPS - National Pipe Straight - threads.
国家螺纹管标准和美国标准直管螺纹(NPS )是无法互换的
NPT threads may look similar to ISO 7/1 threads. However, ISO and NPT threads should not be mixed. ISO threads have 55o taper angle versus 60o for NPT. The NPT root and crest configurations are also different from ISO. For ISO threads pitch is usually measured in millimeters (may be expressed in Inch). The pitch are different.
国家螺纹管标准可能会像ISO 7/1 国际标准化组织的7/1标准。但请不要将两种标准混淆。国际标准化组织的7/1标准有55度的罗纹标准,而国家螺纹管标准则是60度。国家螺纹管标准的顶部和底部和国际标准化组织的7/1标准也不相同。因为国际标准化组织的7/1标准通常是用毫米来度量的。罗纹也不同!
范文二:英制螺纹对照表
管螺纹标准
英制螺纹(55?) 美制螺纹(60?) 标准 非密封圆柱管螺纹 密封圆锥管螺纹 一般密封圆锥管螺纹
外螺纹 内螺纹 外螺纹 内螺纹 外螺纹 内螺纹
(1987,1999年) R
管螺纹标准 G RC NPT R1或R2
(2000年以后)
旧标准 G ZG Z 注:1987年以前,我国很少使用密封圆柱内螺纹(RP和NPSC)
英制密封管螺纹
分为两种:圆柱管螺纹、圆锥管螺纹,两者的区别在:圆柱管螺纹没有锥度, 一般英制密封管螺纹 R
英制密封圆柱内螺纹:R P
英制密封圆锥内螺纹:RC
R:英制圆锥管螺纹55?角, 1/4″英寸 R 1/4″ CC
二、非密封管螺纹 G
G1/4″ G:英制圆柱管螺纹55?角, 大经1/4″英寸
英制螺纹对照表
英寸 每25.4mm内含牙数 螺距 大径(公称直径)mm
1/16 28 0.907 7.23
1/8 28 0.907 9.728
1/4 19 1.337 13.157
3/8 19 1.337 16.662
1/2 14 1.814 20.955
3/4 14 1.814 26.441
1 11 2.309 33.249
1/41 11 2.309 41.910
1/21 11 2.309 47.803
2 11 2.309 59.614
美制螺纹
美制一般密封圆锥管螺纹:NPT
美制一般密封圆柱管螺纹:NPSC
NPT1/2″ NPT:美制60?密封圆锥螺纹,大经:1/2″英寸
美制螺纹对照表
英寸 每25.4mm内含牙数 螺距 大径(公称直径)mm 1/16 27 0.941 7.894 1/8 27 0.941 9.489 1/4 18 1.411 13.616 3/8 18 1.411 17.055 1/2 14 1.814 21.224 3/4 14 1.814 26.569 1 11.5 2.209 33.228 1/41 11.5 2.209 41.985 1/21 11.5 2.209 48.054 2 11.5 2.309 60.092
过 渡 接 头
NPT:1/8-,6 NPT:1/4-,8 NPT:3/8-,12 NPT:1/2-,12
螺 纹 表 示 法 一、公制螺纹:
M20*1.5 M:公制螺纹60?角 20:公称直径 1.5:螺距
范文三:英制螺纹对照表
管螺纹标准
英制密封管螺纹
分为两种:圆柱管螺纹、圆锥管螺纹,两者的区别在:圆柱管螺纹没有锥度,
一般英制密封管螺纹 R 英制密封圆柱内螺纹:R P 英制密封圆锥内螺纹:R C
R C 1/4″ R C :英制圆锥管螺纹55°角, 1/4″英寸
二、非密封管螺纹 G
G1/4″ G:英制圆柱管螺纹55°角, 大经1/4″英寸
英制螺纹对照表
美制螺纹
美制一般密封圆锥管螺纹:NPT 美制一般密封圆柱管螺纹:NPSC
NPT1/2″ NPT:美制60°密封圆锥螺纹,大经:1/2″英寸
美制螺纹对照表
过 渡 接 头
NPT:1/8-¢6 NPT:1/4-¢8 NPT:3/8-¢12 NPT:1/2-¢12
螺 纹 表 示 法 一、公制螺纹:
M20*1.5 M :公制螺纹60°角 20:公称直径 1.5:螺距
范文四:中英制螺纹对照表y
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切削速度与切削液
切削速度(m/min) 切 削 液
加工材料 高速同步丝 水 溶 性 直槽丝攻 螺旋丝攻 先端丝攻 钨钢丝攻 无屑丝攻 管用丝攻 油 性 半干式 干 式 攻 (乳化液) 低碳素钢 C0.25,以下 8~13 8~13 15~25 , 8~13 27~32 3~6 ◎ ? ? ?
C0.25,中碳素钢 7~12 7~12 10~15 , 7~10 27~32 3~6 ◎ ? ? ? 0.45,
高碳素钢 C0.45,以上 6~9 6~9 8~13 , 5~8 22~27 2~5 ◎ ? ? ? 合 金 钢 SCM 7~12 7~12 10~15 , 5~8 22~27 2~5 ◎ ? ? ?
3~5 3~5 4~6 调 质 钢 25,45HRC , , , 2~5 ◎ ? , , (4~8) (4~8) (6~10)
不 锈 钢 SUS 4~7 5~8 8~13 , 5~10 , 3~6 ◎ ? , ,
SUS630 不 锈 钢 3~5 3~5 4~6 , , , 2~5 ◎ , , , SUS631
工 具 钢 SKD 6~9 6~9 7~10 , , , 2~5 ◎ , , , 铸 钢 SC 6~11 6~11 10~15 , , 17~22 2~5 ◎ ? , , 铸 铁 FC 10~15 , , 10~20 , , 2~5 ◎ ? ? ? 球 铸 铁 FCD 7~12 7~12 10~20 10~20 , , 4~8 ◎ ? ? ,
铜 Cu 6~9 6~11 7~12 10~20 7~12 27~32 2~5 ? ? , , 黄 铜 ? Bs?BsC 10~15 10~20 15~25 15~25 7~12 27~32 5~10 ? ? ? ? 黄铜铸件
青 铜 ? PB?PBC 6~11 6~11 10~20 10~20 7~12 , 6~11 ? ? , , 青铜铸件
变 形 AL 10~20 10~20 10~25 , 10~20 100~300 5~10 ◎ ? ? , 铝 合 金
铝 合 金 AC?ADC 10~15 10~15 15~20 10~20 10~15 80~300 10~15 ◎ ? ? , 铸 件
镁 合 金 MC 7~12 7~12 10~15 10~20 , , 10~15 ◎ ? ? , 锌 铸 件 ZDC 7~12 7~12 10~15 10~20 7~12 27~100 10~15 ◎ ? ? ,
Thermo Setting 热硬塑料 10~20 , , 15~25 , , 5~10 , ? ? ? Plastic
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http://www.docin.com/honghaochem3 热可塑性Thermo 10~20 10~15 10~20 10~20 , 27~32 5~10 , ? ? ? 塑 料 Plastic
◎最适 ?适用 ?可使用 ,不可使用
螺纹下孔径表
公制粗牙螺纹 JIS B 0209-1982(单位:mm) 注注(1)(2) 2级崁合度区分:中注注(1)(2) 崁合度区分:中2级内螺纹小径 螺纹尺寸 钻头直径 下孔径 最小直径 最大直径
M 1 × 0.25 0.75 0.78 (80%) 0.729 0.785 1.1 × 0.25 0.85 0.88 (80%) 0.829 0.885 1.2 × 0.25 0.95 0.98 (80%) 0.929 0.985 1.4 × 0.3 1.1 1.14 (80%) 1.075 1.142 1.6 × 0.35 1.25 1.32 (75%) 1.221 1.321 1.8 × 0.35 1.45 1.52 (75%) 1.421 1.521 2 × 0.4 1.6 1.65 (80%) 1.567 1.679 2.2 × 0.45 1.75 1.83 (75%) 1.713 1.838 2.5 × 0.45 2.1 2.13 (75%) 2.013 2.138 3 × 0.5 2.5 2.59 (75%) 2.459 2.599 3.5 × 0.6 2.9 3.01 (75%) 2.850 3.010 4 × 0.7 3.3 3.39 (80%) 3.242 3.422 4.5 × 0.75 3.8 3.85 (80%) 3.688 3.878 5 × 0.8 4.2 4.31 (80%) 4.134 4.334 6 × 1 5 5.13 (80%) 4.917 5.153 7 × 1 6 6.13 (80%) 5.917 6.153 8 × 1.25 6.8 6.85 (85%) 6.647 6.912 9 × 1.25 7.8 7.85 (85%) 7.647 7.912 10 × 1.5 8.5 8.62 (85%) 8.376 8.676 11 × 1.5 9.5 9.62 (85%) 9.376 9.676 12 × 1.75 10.3 10.40 (85%) 10.106 10.441 14 × 2 12 12.2 (85%) 11.835 12.210 16 × 2 14 14.2 (85%) 13.835 14.210 18 × 2.5 15.5 15.7 (85%) 15.294 15.744 20 × 2.5 17.5 17.7 (85%) 17.294 17.744 22 × 2.5 19.5 19.2 (85%) 19.294 19.744 24 × 3 21 21.2 (85%) 20.752 21.252 27 × 3 24 24.2 (85%) 23.752 24.252 30 × 3.5 26.5 26.6 (90%) 26.211 26.771 33 × 3.5 29.5 29.6 (90%) 29.211 29.771 36 × 4 32 32.1 (90%) 31.670 32.270 39 × 4 35 35.1 (90%) 34.670 35.270 42 × 4.5 37.5 37.6 (90%) 37.129 37.799 45 × 4.5 40.5 40.6 (90%) 40.129 40.799 48 × 5 43 43.1 (90%) 42.587 43.297
注(1)M1.4以下等级:5H、M1.6以上等级:6H
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http://www.docin.com/honghaochem3 (2)基于JIS B 0209-1982标准
螺纹下孔径表
公制细牙螺纹 JIS B 0211-1982(单位:mm) 注注(1)(2) 2级崁合度区分:中注注(1)(2) 崁合度区分:中2级内螺纹小径 螺纹尺寸 钻头直径 下孔径 最小直径 最大直径 M 2.5 × 0.35 2.2 2.22 (75%) 2.121 2.221 3 × 0.35 2.7 2.72 (75%) 2.621 2.721 3.5 × 0.35 3.2 3.22 (75%) 3.121 3.221 4 × 0.5 3.5 3.59 (75%) 3.459 3.599 4.5 × 0.5 4 4.09 (75%) 3.959 4.099 5 × 0.5 4.5 4.59 (75%) 4.459 4.599 5.5 × 0.5 5 5.09 (75%) 4.959 5.099 6 × 0.75 5.3 5.35 (80%) 5.188 5.378 7 × 0.75 6.3 6.35 (80%) 6.188 6.378 8 × 1 7 7.13 (80%) 6.917 7.153 8 × 0.75 7.3 7.35 (80%) 7.188 7.378 9 × 1 8 8.13 (80%) 7.917 8.153 9 × 0.75 8.3 8.35 (80%) 8.188 8.378 10 × 1.25 8.8 8.85 (85%) 8.647 8.912 10 × 1 9 9.13 (80%) 8.917 9.153 10 × 0.75 9.3 9.35 (80%) 9.188 9.378 11 × 1 10 10.13 (80%) 9.917 10.153 11 × 0.75 10.3 10.35 (80%) 10.188 10.378 12 × 1.5 10.5 10.62 (85%) 10.376 10.676 12 × 1.25 10.8 10.85 (85%) 10.647 10.912 12 × 1 11 11.13 (80%) 10.917 11.153 14 × 1.5 12.5 12.62 (85%) 12.376 12.676 14 × 1 13 13.13 (80%) 12.917 13.153 15 × 1.5 13.5 13.62 (85%) 13.376 13.676 15 × 1 14 14.13 (80%) 13.917 14.153 16 × 1.5 14.5 14.62 (85%) 14.376 14.676 16 × 1 15 15.13 (80%) 14.917 15.153 17 × 1.5 15.5 15.62 (85%) 15.376 15.676 17 × 1 16 16.13 (80%) 15.917 16.153 18 × 2 16 16.2 (85%) 15.835 16.210 18 × 1.5 16.5 16.62 (85%) 16.376 16.676 18 × 1 17 17.13 (80%) 16.917 17.153 20 × 2 18 18.2 (85%) 17.835 18.210 20 × 1.5 18.5 18.62 (85%) 18.376 18.676 20 × 1 19 19.13 (80%) 18.917 19.153 22 × 2 20 20.2 (85%) 19.835 20.210 22 × 1.5 20.5 20.62 (85%) 20.376 20.676
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http://www.docin.com/honghaochem3 22 × 1 21 21.13 (80%) 20.917 21.153 24 × 2 22 22.2 (85%) 21.835 22.210 24 × 1.5 22.5 22.62 (85%) 22.376 22.676 24 × 1 23 23.13 (80%) 22.917 23.153 25 × 2 23 23.2 (85%) 22.835 23.210 25 × 1.5 23.5 23.62 (85%) 23.376 23.676 25 × 1 24 24.13 (80%) 23.917 24.153
螺纹下孔径表
公制细牙螺纹 JIS B 0211-1982(单位:mm)
注注(1)(2) 2级崁合度区分:中注注(1)(2) 崁合度区分:中2级内螺纹小径 螺纹尺寸 钻头直径 下孔径 最小直径 最大直径
M 26 × 1.5 24.5 24.62 (85%) 24.376 24.676 27 × 2 25 25.2 (85%) 24.835 25.210 27 × 1.5 25.5 25.62 (85%) 25.376 25.676 27 × 1 26 26.13 (80%) 25.917 26.153 28 × 2 26 26.2 (85%) 25.835 26.210 28 × 1.5 26.5 26.62 (85%) 26.376 26.676 28 × 1 27 27.13 (80%) 26.917 27.153 30 × 3 27 27.2 (85%) 26.752 27.252 30 × 2 28 28.2 (85%) 27.835 28.210 30 × 1.5 28.5 28.62 (85%) 28.376 28.676 30 × 1 29 29.13 (80%) 28.917 29.153 32 × 2 30 30.2 (85%) 29.835 30.210 32 × 1.5 30.5 30.62 (85%) 30.376 30.676 33 × 3 30 30.2 (85%) 29.752 30.252 33 × 2 31 31.2 (85%) 30.835 31.210 33 × 1.5 31.5 31.62 (85%) 31.376 31.676 35 × 1.5 33.5 33.62 (85%) 33.376 33.676 36 × 3 33 33.2 (85%) 32.752 33.252 36 × 2 34 34.2 (85%) 33.835 34.210 36 × 1.5 34.5 34.62 (85%) 34.376 34.676 38 × 1.5 36.5 36.62 (85%) 36.376 36.676 39 × 3 36 36.2 (85%) 35.752 36.252 39 × 2 37 37.2 (85%) 36.835 37.210 39 × 1.5 37.5 37.62 (85%) 37.376 37.676 40 × 3 37 37.2 (85%) 36.752 37.252 40 × 2 38 38.2 (85%) 37.835 38.210 40 × 1.5 38.5 38.62 (85%) 38.376 38.676 42 × 4 38 38.1 (90%) 37.670 38.270 42 × 3 39 39.2 (85%) 38.752 39.252 42 × 2 40 40.2 (85%) 39.835 40.210 42 × 1.5 40.5 40.62 (85%) 40.376 40.676
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45 × 4 41 41.1 (90%) 40.670 41.270
45 × 3 42 42.2 (85%) 41.752 42.252
45 × 2 43 43.2 (85%) 42.835 43.210
45 × 1.5 43.5 43.62 (85%) 43.376 43.676
48 × 4 44 44.1 (90%) 43.670 44.270
48 × 3 45 45.2 (85%) 44.752 45.252
46.2 (85%) 48 × 2 46 45.835 46.210
48 × 1.5 46.5 46.62 (85%) 46.376 46.676
50 × 3 47 47.2 (85%) 46.752 47.252
50 × 2 48 48.2 (85%) 47.835 48.210
50 × 1.5 48.5 48.62 (85%) 48.376 48.676 注(1)等级:6H
(2)基于JIS B 0211-1982标准
螺纹下孔径表
美制粗牙螺纹 (单位:mm)
内 螺 纹 小 径 2B级 螺 纹 螺纹尺寸 钻头直径 下 孔 径 最小直径 最大直径
NO.1 -64UNC 1.55 1.57 (65%) 1.425 1.582
2 -56 1.8 1.86 (65%) 1.695 1.871
3 -48 2.1 2.14 (65%) 1.941 2.146
4 -40 2.3 2.36 (70%) 2.157 2.385
5 -40 2.6 2.69 (70%) 2.487 2.697
6 -32 2.8 2.86 (75%) 2.642 2.895
8 -32 3.4 3.52 (75%) 3.302 3.530
10 -24 3.9 3.91 (80%) 3.683 3.962
12 -24 4.5 4.57 (80%) 4.344 4.597
1/4 -20 5.1 5.25 (80%) 4.979 5.257 5/16 -18 6.6 6.72 (80%) 6.401 6.731
3/8 -16 8 8.15 (80%) 7.798 8.153 7/16 -14 9.4 9.5(80%) 9.144 9.550
1/2 -13 10.8 11.0 (80%) 10.592 11.023
9/16 -12 12.2 12.3 (85%) 11.989 12.446
5/8 -11 13.6 13.8 (85%) 13.386 13.868
3/4 -10 16.5 16.8 (80%) 16.307 16.840
7/8 - 9 19.5 19.6 (85%) 19.177 19.761
1 - 8 22.2 22.5 (85%) 21.971 22.606
1 1/8 - 7 25 25.2 (85%) 24.638 25.349
1 1/4 - 7 28.2 28.4 (85%) 27.813 28.524
1 3/8 - 6 30.8 31.0 (85%) 30.353 31.115
1 1/2 - 6 34 34.2 (85%) 33.528 34.290
1 3/4 - 5 39.5 39.8 (85%) 38.964 39.827
2 - 4 45.2 45.3 (90%) 44.679 45.593
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螺纹下孔径表
美制细牙螺纹 (单位:mm)
内 螺 纹 小 径 2B级 螺 纹 螺纹尺寸 钻头直径 下 孔 径 最小直径 最大直径 NO. 0 1.25 1.30 (65%) 1.182 1.305 -80UNF
1 -72 1.55 1.61 (65%) 1.474 1.612
2 -64 1.85 1.90 (65%) 1.756 1.912
3 -56 2.1 2.17 (70%) 2.025 2.197
4 -48 2.4 2.44 (70%) 2.271 2.458
5 -44 2.7 2.74 (70%) 2.551 2.740
6 -40 2.9 3.02 (70%) 2.820 3.022
8 -36 3.5 3.59 (75%) 3.404 3.606
10 -32 4.1 4.14 (80%) 3.963 4.165
12 -28 4.6 4.70 (80%) 4.496 4.724
1/4 -28 5.5 5.56 (80%) 5.360 5.588 5/16 -24 6.9 7.02 (80%) 6.782 7.035
3/8 -24 8.5 8.61 (80%) 8.382 8.636
7/16 -20 9.9 10.01 (80%) 9.729 10.033
1/2 -20 11.5 11.60 (80%) 11.329 11.607
9/16 -18 12.9 13.07 (80%) 12.751 13.081
5/8 -18 14.5 14.65 (80%) 14.351 14.681
3/4 -16 17.5 17.59 (85%) 17.323 17.678
7/8 -14 20.5 20.6 (85%) 20.270 20.675
1 -12 23.2 23.5 (85%) 23.114 23.571
1 1/8 -12 26.5 26.7 (80%) 26.289 26.746
1 1/4 -12 29.5 29.9 (80%) 29.464 29.921
1 3/8 -12 32.8 33.0 (85%) 32.639 33.096
1 1/2 -12 36 36.2 (85%) 35.814 36.271
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螺纹下孔径表
缝纫机螺纹(SM) (单位:mm)
2级 内 螺 纹 小 径 2B级 螺 纹 螺纹尺寸 钻头直径 下 孔 径 最小直径 最大直径 SM 1/16 - 1.25 1.28 (75%) 1.211 1.281 80
5/64 - 64 1.55 1.57 (80%) 1.513 1.593 3/32 -100 2.10 2.15 (70%) 2.081 2.156 3/32 - 56 1.85 1.91 (80%) 1.841 1.936 1/8 - 44 2.50 2.58 (80%) 2.485 2.605 1/8 - 40 2.45 2.52 (80%) 2.421 2.551 9/64 - 40 2.85 2.91 (80%) 2.818 2.948 11/64 - 40 3.65 3.71 (80%) 3.612 3.742 3/16 - 32 3.90 3.94 (80%) 3.820 3.980 3/16 - 28 3.70 3.82 (80%) 3.684 3.844 7/32 - 32 4.70 4.73 (80%) 4.614 4.774 15/64 - 28 4.90 5.01 (80%) 4.875 5.055 1/4 - 40 5.60 5.69 (80%) 5.596 5.726 1/4 - 28 5.30 5.41 (80%) 5.272 5.452 缝纫机螺纹(SM) (单位:mm)
2级 内 螺 纹 小 径 2B 级 螺 纹 螺纹尺寸 钻头直径 下 孔 径 最小直径 最大直径 SM 1/4 - 5.10 5.25 (80%) 5.086 5.266 24
9/32 - 28 6.10 6.20 (80%) 6.066 6.256
9/32 - 20 5.70 5.82 (80%) 5.634 5.824
5/16 - 28 6.90 6.00 (80%) 6.860 7.050
5/16 - 24 6.70 6.84 (80%) 6.674 6.864
5/16 - 18 6.30 6.38 (85%) 6.254 6.444
3/8 - 28 8.50 8.58 (80%) 8.447 8.637
3/8 - 18 7.90 7.97 (85%) 7.843 8.053
7/16 - 28 10.10 10.17 (80%) 10.034 10.224
7/16 - 16 9.30 9.36 (85%) 9.220 9.440
1/2 - 28 11.70 11.76 (80%) 11.622 11.812
1/2 - 20 11.30 11.38 (80%) 11.190 11.410
1/2 - 12 10.30 10.36 (85%) 10.180 10.420 螺纹下孔径表
英制粗牙螺纹 (单位:mm)
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范文五:英制公制管螺纹对照表
英制,公制螺纹对照表.
2008-03-18 12:41:49| 分类: | 标签: |字号大中小 订阅
尺寸代号 每英寸牙数 螺 距 螺纹 直 径 (in) n p 大径D、d 1/16 28 0.907 7.723 1/8 28 0.907 9.728 1/4 19 1.337 13.157 3/8 19 1.337 16.662 1/2 14 1.814 20.955 5/8 14 1.814 22.911 3/4 14 1.814 26.441 7/8 14 1.814 30.201 1 11 2.309 33.249 1-1/8 11 2.309 37.897 1-1/4 11 2.309 41.91 1-1/2 11 2.309 47.803 1-3/4 11 2.309 53.746 2 11 2.309 59.614 2-1/4 11 2.309 65.71 2-1/2 11 2.309 75.184 2-3/4 11 2.309 81.534 3 11 2.309 87.884 3-1/2 11 2.309 100.33 4 11 2.309 113.03 5 11 2.309 138.43 6 11 2.309 163.83 注:1in=25.4mm
1、用螺纹密封的管螺纹其标记及各种螺纹的特征代号规定如下: 小径D1、d1 6.561 8.566 11.445 14.95 18.631 20.587 24.117 27.877 30.291 34.939 38.952 44.845 50.788 56.656 62.752 72.226 78.578 84.926 97.372 110.072 135.472 160.872
Rc—圆锥内螺纹 55度
Rp—与圆锥外螺纹配合的圆柱内螺纹
R—圆锥外螺纹
标准规定将螺纹尺寸代号写在特征代号之后,若螺纹为械旋应再加写左旋 代号LH,具体示例如下:
圆锥内螺纹:Rc1/2
左旋圆柱内螺纹:Rp1/2—LH
圆柱内螺纹与圆锥外螺纹的配合:Rp2/R2
左旋B级外螺纹:G1/2B—LH
螺纹副G1/2G1/2A
内螺纹:G1/2