Who can classify the thread systems?

Fastening connection threads – Metric ordinary threads (M), American Unified threads (UN), British Whitworth threads (B). S. W. , B. S. F, Whit. S and Whit), metric fine threads (S), metric aeronautical threads (MJ), American aeronautical threads (UNJ). Transmission connection threads – metric trapezoidal threads (30’{‘ When O}) (Tr), American trapezoidal threads (29’) (ACME), metric serrated threads (3‘/30’) (B), American and British serrated threads (7‘/45’). Pipe threads – British pipe threads (55’), American pipe threads (60’), metric pipe threads (60’). I recommend that you take a look at the “Standards Manual for Metric, American, and British Threads”: lol

Threads: There are many ways to classify threads, and those commonly used in the instrumentation industry. Such threads can also be classified by the industry in which they are used. The main types of threads used in instruments are: P-thread system, T-thread system, NPT American tapered thread, M metric straight thread, R British tapered thread, UN American straight thread, G British straight thread. Note: The P-thread system is a nominal-size thread system, while the T-thread system is a true-size thread system. 1. Tapered threads A. NPT threads (NPT) comply with the following standard: ANSI/ASME B1.20.1-1983 ； GB/T 12716-2002. Thread size code, number of threads per inch, basic diameter in the reference plane, reference distance, major diameter, middle diameter, minor diameter, number of turns, length: 1/16 – 27, 7.894, 7.142, 6.389, 4.32±1, 4.064±0.941; 1/8 – 27, 10.242, 9.489, 8.737, 4.36±1, 4.102±0.941; 1/4 – 18, 13.616, 12.487, 11.358, 4.10±1, 5.785±1.411; 3/8 – 18, 17.055, 15.926, 14.797, 4.32±1, 6.096±1.411; 1/2 – 14, 21.224, 19.772, 18.321, 4.48±1, 8.128±1.814; 3/4 – 14, 26.569, 25.117, 23.666, 4.75±1, 8.618±1.814; 1 – 11.5, 33.228, 31.461, 29.694, 4.60±1, 10.160±2.209; 11/4 – 11.5, 41.985, 40.218, 38.451, 4.83±1, 10.668±2.209; 11/2 – 11.5, 48.054, 46.287, 44.520, 4.83±1, 10.668±2.209; 2 – 11.5, 60.092, 58.325, 56.558, 5.01±1, 11.065±2.209. Thread angle: 60° ； .The pitch is measured in inches ； . In the cross-section through the thread axis, the root and crest of the tooth are flat ； . Thread taper 1:16 ； .Sealing type: Thread sealant. Female threads come in two forms – one is NPT female threads, and the other is NPSC straight-thread female threads. . Marking method: Relevant standards – Right-hand threads, Left-hand threads, ASME B1.20.1, 3/8-18NPT, 3/8-18NPT-LH, GB/T 12716, NPT3/8, NPT3/8-LH. B.BSP tapered threads (R, R1, R2; Rc; ZG, RT, PT, BSPT). The threads comply with the following standards: ISO 7/1-1994 ； BS 21-1985 ； DIN 2999 ； JIS B0203-1999 ； GB/T 7306.2-2000. Thread size code, number of threads per inch, basic diameter in the reference plane, reference distance, major diameter, middle diameter, minor diameter, number of turns, length: 1/16 – 28 threads, 7.723, 7.142, 6.561; 4.41±1, 4.0±0.9. 1/8 – 28 threads, 9.728, 9.147, 8.566; 4.41±1, 4.0±0.9. 1/4 – 19 threads, 13.157, 12.301, 11.445; 4.49±1, 6.0±1.3. 3/8 – 19 threads, 16.662, 15.806, 14.950; 4.79±1, 6.4±1.3. 1/2 – 14 threads, 20.995, 19.793, 18.631; 4.52±1, 8.2±1.8. 3/4 – 14 threads, 26.441, 25.279, 24.117; 5.24±1, 9.5±1.8. 1 – 11 threads, 33.249, 31.770, 30.291; 4.50±1, 10.4±2.3. 11/4 – 11 threads, 41.910, 40.431, 38.952; 5.50±1, 12.7±2.3. 11/2 – 11 threads, 47.803, 46.324, 44.845; 5.50±1, 12.7±2.3. 2 – 11 threads, 59.614, 58.135, 56.656; 6.89±1, 15.9±2.3. Thread pitch angle: 55° ； .The pitch is measured in inches ； .In the cross-section through the thread axis, the root and crest of the tooth are arc-shaped ； . Thread taper 1:16 ； .Sealing type: Thread sealant. Female thread, Male thread, Rc tapered tube, R2 tapered tube – often also denoted as R; Rp straight tube, R1. Notation methods: Relevant standards; Right-hand thread, Left-hand thread; ISO 7/1, ISO 7-Rc3/8 (internal), ISO 7-Rc3/8LH (internal), ISO 7-R3/8 (external), ISO 7-R3/8LH (external), ISO 7/1, ISO 7-Rp3/8 (internal), ISO 7-Rp3/8LH (internal), ISO 7-R3/8 (external), ISO 7-R3/8LH (external); GB/T 7306.2, Rc3/8 (internal), Rc3/8LH (internal), R23/8 (external), R23/8LH (external); GB/T 7306.1, Rp3/8 (internal), Rp3/8LH (internal), R23/8 (external), R23/8LH (external). Note: The text in parentheses is explanatory and is not included in the thread notation. 2. Straight or flat threads: A. BSP flat threads (G, PF, BSPP); these threads comply with the following standard: BS 2779 ； ISO 228/1 ； DIN ISO 228/1 ； JIS B0202-1999 ； DIN 3852 ； GB/T7307-2001。 Thread size (inches) Teeth per inch Basic diameter Major diameter Middle diameter Minor diameter 1/16 28 7.723 7.142 6.561 1/8 28 9.728 9.147 8.566 1/4 19 13.157 12.301 11.445 3/8 19 16.662 15.806 14.950 1/2 14 20.995 19.793 18.631 5/8 14 22.911 21.749 20.587 3/4 14 26.441 25.279 24.117 7/8 14 30.201 29.039 27.877 1 11 33.249 31.770 30.291 11/8 11 37.897 36.418 34.939 11/4 11 41.910 40.431 38.952 11/2 11 47.803 46.324 44.845 13/4 11 53.746 52.267 50.788 2 11 59.614 58.135 56.656. Thread angle: 55° ； .The pitch is measured in inches ； . The cut surfaces at the root and tip are circular ； The sealing types are as follows: 1. RS fittings and RS gaskets. 2. RP fittings and RP gaskets. Note: RP gaskets can also be used with RS fittings. 3. RG fittings and RG gaskets. Designation method: Relevant standards; right-hand thread, left-hand thread. ISO 228/1, ISO 228-G3/8 (internal), ISO 228-G3/8LH (internal), ISO 228-G3/8A (external), ISO 228-G3/8ALH (external), ISO 228-G3/8B (external), ISO 228-G3/8BLH (external); GB/T 7307, G3/8 (internal), G3/8-LH (internal), G3/8A (external), G3/8A-LH (external), G3/8B (external), G3/8B-LH (external). Note: The text in parentheses is explanatory and is not included in the thread designation. B. SAE/MS threads (UN, UNJ): SAE/MS is a type of connection that uses UN threads along with O-rings; it provides good sealing in hydraulic systems. The threads comply with the following standard: ASME/ANSI B1.1-1989(R 2001) ； SAE J1926 ； MS16142。 Thread size, Number of threads per inch, Basic diameter, Major diameter, Mean diameter, Minor diameter: 5/16-24: 24, 7.938, 7.249, 6.792; 7/16-20: 20, 11.113, 10.287, 9.738; 1/2-20: 20, 12.700, 11.875, 11.325; 9/16-18: 18, 14.288, 13.325, 12.559; 3/4-16: 16, 19.050, 18.019, 17.331; 11/16-12: 12, 26.988, 25.613, 24.695; 15/16-12: 12, 33.338, 31.963, 31.046. Thread angle: 60° ； .The pitch is measured in inches ； . The cut surfaces at the root and tip are flat ； .Sealing type: O-ring seal at the root of the male thread. . Notation method: Relevant standards – Right-hand thread, Left-hand thread. ASME B1.1: 3/8-16UNC-2B (female), 3/8-16UNC-2B-LH (female), 3/8-16UNC-2A (male), 3/8-16UNC-2A-LH (male). Note: The text in parentheses is explanatory and is not included in the thread notation. C. Metric straight threads (M): These threads comply with the standard GB/T196-2003 ； ISO 261-1998. Thread size, pitch, basic diameter, major diameter, middle diameter, minor diameter: M6x1 – 1, 6.000, 5.350, 4.917; M8x1 – 8.000, 7.350, 6.917; M10x1 – 10.000, 9.350, 8.917; M12x1.5 – 1.5, 12.000, 11.026, 10.376; M14x1.5 – 14.000, 13.026, 12.376; M16x1.5 – 16.000, 15.026, 14.376; M18x1.5 – 18.000, 17.026, 16.376; M20x1.5 – 20.000, 19.026, 18.376; M22x1.5 – 22.000, 21.026, 20.376; M24x1.5 – 24.000, 23.026, 22.376; M27x2 – 2, 27.000, 25.701, 24.835; M30x2 – 30.000, 28.701, 27.835; M33x2 – 33.000, 31.701, 30.835; M36x2 – 36.000, 34.701, 33.835; M39x2 – 39.000, 37.701, 36.835; M42x2 – 42.000, 40.701, 39.835; M45x2 – 45.000, 43.701, 42.835; M48x2 – 48.000, 46.701, 45.835. Thread angle: 60° ； . The pitch is measured in millimeters ； . The cut surfaces at the root and tip are flat ； . The sealing type is as follows: 1. Male thread with RS gasket ； 2. Male thread with RG gasket ； 3. Male thread with RP gasket ； 4. Male thread with O-ring ； . Marking method: Relevant standards, right-hand thread, left-hand thread. ISO 261, ISO 261-M10(x1.25)-6g (female), ISO 261-M10(x1.25)LH-6g (female), ISO 261-M10x1-6g (female), ISO 261-M10x1LH-6g (female), ISO 261-M10(x1.25)-6H (male), ISO 261-M10(x1.25)LH-6H (male), ISO 261-M10x1-6H (male), ISO 261-M10x1LH-6H (male). GB/T196, M10(x1.25)-6g (female), M10(x1.25) left-handed – 6g (female), M10x1-6g (female), M10x1 left-handed – 6g (female), M10(x1.25)-6H (male), M10(x1.25) left-handed – 6H (male), M10x1-6H (male), M10x1 left-handed – 6H (male). Note: The text in parentheses is explanatory and is not included in the thread markings. 3. Rated pressure: A. Thread types NPT and ISO 7; rated pressure, thread size in inches, material – 316 stainless steel, carbon steel, brass; male thread, female thread, male thread, female thread. psig, Mpa, psig, Mpa, psig, Mpa: 1/16: 11000, 75.9, 6700, 46.2, 5500, 37.9, 3300, 22.8; 1/8: 10000, 69.0, 6500, 44.8, 5000, 34.5, 3200, 22.1; 1/4: 8000, 55.2, 6600, 45.5, 4000, 27.6, 3300, 22.8; 3/8: 7800, 53.8, 5300, 36.6, 3900, 26.9, 2600, 17.9; 1/2: 7700, 53.1, 4900, 33.8, 3800, 26.2, 2400, 16.6; 3/4: 7300, 50.3, 4600, 31.7, 3600, 24.8, 2300, 15.9; 1: 5300, 36.6, 4400, 30.3, 2800, 19.3, 2200, 15.2; 11/4: 6000, 41.4, 5000, 34.5, 3000, 20.7, 2500, 17.2; 11/2: 5000, 34.5, 4600, 31.7, 2500, 17.2, 2300, 15.9; 2: 3900, 26.9, 3900, 26.9, 1900, 13.1, 1900, 13.1. Note: Calculated according to the process piping standard ASME B31.3. B.SAE/MS thread end rated pressure SAE/MS thread size 316 stainless steel, carbon steel General construction Adjustable position psig Mpa psig Mpa 5/16-24 4568 31.5 4568 31.5 7/16-20 1/2-20 9/16-18 3626 25.0 3/4-16 7/8-14 3626 25.0 2900 20.0 11/16-12 13/16-12 2900 20.0 2320 16.0 15/16-12 15/8-12 2320 16.0 1813 12.5 17/8-12 21/2-12 1813 12.5 1450 10.0 Note: Rated pressure is from SAE J1926/3. C. Rated Pressure for Metric Straight Threaded Ends – Metric thread sizes, 316 stainless steel, carbon steel: Male threads, Female threads. psig, Mpa; psig, Mpa. M6x1: 12000, 82.5; 6900, 47.6. M8x1: 11000, 75.9; 6700, 46.2. M10x1: 10000, 69.0; 6500, 44.8. M12x1.5: 9000, 62.1; 6500, 44.8. M14x1.5: 8000, 55.2; 6600, 45.5. M16x1.5: 7800, 53.8; 5800, 40.0. M18x1.5: 7800, 53.8; 5300, 36.6. M20x1.5: 7700, 53.1; 5000, 34.5. M22x1.5: 7700, 53.1; 4900, 33.8. M24x1.5: 7400, 51.0; 4700, 32.4. M27x2: 7300, 50.3; 4600, 31.7. M30x2: 6100, 42.1; 4500, 31.0. M33x2: 5300, 36.6; 4400, 30.3. M36x2: 5100, 35.2; 4000, 27.6. M39x2: 5000, 34.5; 3900, 26.9. M42x2: 6000, 41.4; 5000, 34.5. M45x2: 5400, 37.2; 4700, 32.4. M48x2: 5000, 34.5; 4600, 31.7. Others: 1. P-threaded fittings are a series of threads designed for use with P-tubes; not all P-tubes can have threads of corresponding sizes created on them – only tubes of grade SCH40 and above are suitable for threading. 2. The P tube after threading will not affect the rated operating pressure, as this wall thickness has already been taken into account during design. 3. The thickened T-tube can cut threads of actual size; these threads rely on auxiliary sealing and are used in ultra-high pressure pipelines. 4. UN threads can be combined with sealing methods to form standards such as JIC and SAE/MS. 5. Metric tapered threads are widely used in the hydraulic industry, with **GB/T 1415-1992 as the reference standard. 6. For threads of the ISO 7-1 type, the European system commonly uses an external tapered tube combined with an internal straight-threaded tube, while the American system generally uses an external taper combined with an internal tapered-threaded tube. In our country, external cones with internal straight threads are generally used in medium and low pressure applications ； An external cone with an internal tapered thread is used in high-pressure equipment. The sealing pair consisting of an external cone and an internal tapered thread has a relatively long length, which imposes strict requirements on thread machining; it is not easy to achieve sealing, but once sealed, it provides excellent sealing performance. The sealing pair with an external cone and internal straight thread actually has only 1-2 thread surfaces, which makes sealing easy to achieve; however, the seal is not as reliable as that achieved with an external cone and internal cone. 8. G internal threads cannot be used in combination with R external tapered threads, otherwise the sealing effect will not be guaranteed. 9. British tapered pipe threads used in combination with American tapered pipe threads can also provide sealing, but this results in permanent damage to the threads. 10. When sealing tapered pipe threads, Teflon tape needs to be wrapped, in a direction opposite to that of tightening the threads. This post was last edited by leonnie on 2009-1-7 11:34.]

It’s a pity I can’t attach the images; I’ll upload them once they’re ready. This is a summary of pipe threads, which will help you understand them clearly

3rd floor, it would be great if it were Excel

Some design manuals already provide classifications, and there are many types of threads; it’s sufficient to collect those that you use most often.

Thank you to the person on floor 3 – it’s very detailed and pleasant to read

Take a look at the \"Standard Manual for Metric, Imperial, and British Threads\" http://bbs.hcbbs.com/viewthread.php?tid=571947