Parallel (straight) threads, British Standard Pipe Parallel thread (BSPP; originally also known as[1]British Standard Pipe Fitting thread/BSPF and British Standard Pipe Mechanical thread/BSPM), which have a constant diameter; denoted by the letter G.
Taper threads, British Standard Pipe Taper thread (BSPT), whose diameter increases or decreases along the length of the thread; denoted by the letter R.
These are pipe threads where pressure-tightness is made through the mating of two threads together. They always use a taper male thread, but can have either parallel or taper female threads. (In Europe, taper female pipe threads are not commonly used.)
Longscrew threads
These are parallel pipe threads used where a pressure-tight joint is achieved by the compression of a soft material (such as an o-ring seal or a washer) between the end face of the male thread and a socket or nipple face, with the tightening of a backnut.
Symmetrical V-thread in which the angle between the flanks is 55° (measured in an axial plane)
One-sixth of this sharp V is truncated at the top and the bottom
The threads are rounded equally at crests and roots by circular arcs ending tangentially with the flanks where r ≈ 0.1373P
The theoretical depth of the thread is therefore 0.6403 times the nominal pitch h ≈ 0.6403P
Pipe thread sizesedit
At least 41 thread sizes have been defined, ranging from 1⁄16 to 18, although of these only 15 are included in ISO 7 and 24 in ISO 228.[3][4][5][6] The size number was originally based on the inner diameter (measured in inches) of a steel tube for which the thread was intended, but contemporary pipes tend to use thinner walls to save material, and thus have an inner diameter larger than this nominal size. In the modern standard metric version, it is simply a size number, where listed diameter size is the major outer diameter of the external thread. For a taper thread, it is the diameter at the "gauge length" (plus/minus one thread pitch) from the small end of the thread. The taper is 1:16, meaning that for each 16 units of measurement increase in the distance from the end, the diameter increases by 1 unit of measurement.
These standard pipe threads are formally referred to by the following sequence of blocks:
the words, Pipe thread,
the document number of the standard (e.g., ISO 7 or EN 10226)
the symbol for the pipe thread type:
G, external and internal parallel (ISO 228)
R, external taper (ISO 7)
Rp, internal parallel (ISO 7/1)
Rc, internal taper (ISO 7)
Rs, external parallel
the thread size
Threads are normally right-hand. For left-hand threads, the letters, LH, are appended.
Example: Pipe thread EN 10226 Rp 2+1⁄2
The terminology for the use of G and R originated from Germany (G for gas, as it was originally designed for use on gas pipes; R for rohr, meaning pipe.)
Pipe and fastener dimensionsedit
G / R size
Typ. nut sizes
Corresponding pipe
DN
OD
Wall
(in)
(mm)
(mm)
(mm)
(mm)
1⁄16
3
1⁄8
15
6
10.2
2
1⁄4
19
8
13.5
2.3
3⁄8
22 or 23
10
17.2
2.3
1⁄2
27
15
21.3
2.6
3⁄4
32
20
26.9
2.6
1
43
25
33.7
3.2
1+1⁄4
53
32
42.4
3.2
1+1⁄2
57
40
48.3
3.2
2
70
50
60.3
3.6
2+1⁄2
65
76.1
3.6
3
80
88.9
4
4
100
114.3
4.5
5
125
139.7
5
6
150
168.3
5
ISO 7 (Pressure Tight threads)edit
The standard ISO 7 - Pipe threads where pressure-tight joints are made on the threads consists of the following parts:
ISO 7-1:1994 Dimensions, tolerances and designation
ISO 7-2:2000 Verification by means of limit gauges
ISO 228 (Non Pressure Tight Threads)edit
The standard ISO 228 - Pipe threads where pressure-tight joints are not made on the threads consists of the following parts:
ISO 228-1:2000 Dimensions, tolerances and designation
ISO 228-2:1987 Verification by means of limit gauges
^"BSPM = British Standard Pipe Mechanical". Retrieved 14 July 2016.
^(PDF). Archived from the original (PDF) on 2013-10-07. Retrieved 2013-12-27.
^maryland metrics. . Archived from the original on 24 July 2018. Retrieved 14 July 2016.
^. Archived from the original on 22 July 2018. Retrieved 14 July 2016.
^"How to ID British (BSP) Threads" (PDF). Retrieved 20 November 2017.
^"BSP Thread data". www.practicalmachinist.com. 2 May 2012. Retrieved 2016-07-15.
External linksedit
British Standard Pipe Parallel Thread Dimensions
British Standard Pipe Taper Thread Dimensions 2017-09-27 at the Wayback Machine
BSP Thread Charts and Diagrams, showing dimensions of tubing and fittings
ISO 7-1:1994
ISO 7-2:2000
ISO 228-1:2000
ISO 228-2:1987
Parallel pipe threads G
Parallel pipe threads PF
January 01, 1970
british, standard, pipe, redirects, here, coded, character, technical, standards, screw, threads, that, been, adopted, internationally, interconnecting, sealing, pipes, fittings, mating, external, male, thread, with, internal, female, thread, been, adopted, st. ISO 7 redirects here For the 7 bit coded character set see ISO IEC 646 British Standard Pipe BSP is a set of technical standards for screw threads that has been adopted internationally for interconnecting and sealing pipes and fittings by mating an external male thread with an internal female thread It has been adopted as standard in plumbing and pipe fitting except in North America where NPT and related threads are used Contents 1 Types 2 Thread form 3 Pipe thread sizes 4 Pipe and fastener dimensions 5 ISO 7 Pressure Tight threads 6 ISO 228 Non Pressure Tight Threads 7 See also 8 References 9 External linksTypes edit nbsp BSPP fitting Two types of threads are distinguished Parallel straight threads British Standard Pipe Parallel thread BSPP originally also known as 1 British Standard Pipe Fitting thread BSPF and British Standard Pipe Mechanical thread BSPM which have a constant diameter denoted by the letter G Taper threads British Standard Pipe Taper thread BSPT whose diameter increases or decreases along the length of the thread denoted by the letter R nbsp BSPT threads 2 These can be combined into two types of joints Jointing threads These are pipe threads where pressure tightness is made through the mating of two threads together They always use a taper male thread but can have either parallel or taper female threads In Europe taper female pipe threads are not commonly used Longscrew threads These are parallel pipe threads used where a pressure tight joint is achieved by the compression of a soft material such as an o ring seal or a washer between the end face of the male thread and a socket or nipple face with the tightening of a backnut Thread form editThe thread form follows the British Standard Whitworth standard Symmetrical V thread in which the angle between the flanks is 55 measured in an axial plane One sixth of this sharp V is truncated at the top and the bottom The threads are rounded equally at crests and roots by circular arcs ending tangentially with the flanks where r 0 1373P The theoretical depth of the thread is therefore 0 6403 times the nominal pitch h 0 6403PPipe thread sizes editAt least 41 thread sizes have been defined ranging from 1 16 to 18 although of these only 15 are included in ISO 7 and 24 in ISO 228 3 4 5 6 The size number was originally based on the inner diameter measured in inches of a steel tube for which the thread was intended but contemporary pipes tend to use thinner walls to save material and thus have an inner diameter larger than this nominal size In the modern standard metric version it is simply a size number where listed diameter size is the major outer diameter of the external thread For a taper thread it is the diameter at the gauge length plus minus one thread pitch from the small end of the thread The taper is 1 16 meaning that for each 16 units of measurement increase in the distance from the end the diameter increases by 1 unit of measurement G Rsize Threaddensity TPI Threadpitch Majordiameter Minordiameter Gaugelength Tapping drill R 95 G 80 in in 1 mm in mm in mm in mm mm mm 1 16 28 0 907 0 3041 7 723 0 2583 6 561 5 32 4 0 6 6 6 8 1 8 28 0 907 0 3830 9 728 0 3372 8 566 5 32 4 0 8 6 8 8 1 4 19 1 337 0 5180 13 157 0 4506 11 445 0 2367 6 0 11 5 11 8 3 8 19 1 337 0 6560 16 662 0 5886 14 950 1 4 6 4 15 0 15 3 1 2 14 1 814 0 8250 20 955 0 7335 18 631 0 3214 8 2 18 7 19 1 5 8 14 1 814 0 9020 22 911 0 8105 20 587 0 3214 8 2 20 7 21 1 3 4 14 1 814 1 0410 26 441 0 9495 24 117 3 8 9 5 24 2 24 6 7 8 14 1 814 1 1890 30 201 1 0975 27 877 3 8 9 5 28 0 28 3 1 11 2 309 1 3090 33 249 1 1926 30 291 0 4091 10 4 30 4 30 9 1 1 8 11 2 309 1 4920 37 897 1 3756 34 939 0 4091 10 4 35 1 35 5 1 1 4 11 2 309 1 6500 41 910 1 5335 38 952 1 2 12 7 39 1 39 5 1 3 8 11 2 309 1 7450 44 323 1 6285 41 365 1 2 12 7 41 5 42 0 1 1 2 11 2 309 1 8820 47 803 1 7656 44 845 1 2 12 7 45 0 45 4 1 5 8 11 2 309 2 0820 52 883 1 9656 49 926 5 8 15 9 50 1 50 5 1 3 4 11 2 309 2 1160 53 746 1 9995 50 788 5 8 15 9 50 9 51 4 1 7 8 11 2 309 2 2440 56 998 2 1276 54 041 5 8 15 9 54 2 54 6 2 11 2 309 2 3470 59 614 2 2306 56 656 5 8 15 9 56 8 57 2 2 1 4 11 2 309 2 5870 65 710 2 4706 62 752 11 16 17 5 62 9 63 3 2 1 2 11 2 309 2 9600 75 184 2 8435 72 226 11 16 17 5 72 4 72 8 2 3 4 11 2 309 3 2100 81 534 3 0935 78 576 13 16 20 6 78 7 79 2 3 11 2 309 3 4600 87 884 3 3435 84 926 13 16 20 6 85 1 85 5 3 1 4 11 2 309 3 7000 93 980 3 5835 91 022 7 8 22 2 91 2 91 6 3 1 2 11 2 309 3 9500 100 330 3 8335 97 372 7 8 22 2 97 5 98 0 3 3 4 11 2 309 4 2000 106 680 4 0835 103 722 7 8 22 2 103 9 104 3 4 11 2 309 4 4500 113 030 4 3335 110 072 1 25 4 110 2 110 7 4 1 2 11 2 309 4 9500 125 730 4 8335 122 772 1 25 4 122 9 123 4 5 11 2 309 5 4500 138 430 5 3335 135 472 1 1 8 28 6 135 6 136 1 5 1 2 11 2 309 5 9500 151 130 5 8335 148 172 1 1 8 28 6 148 3 148 8 6 11 2 309 6 4500 163 830 6 3335 160 872 1 1 8 28 6 161 0 161 5 7 10 2 540 7 4500 189 230 7 3220 185 979 1 3 8 34 9 186 1 186 6 8 10 2 540 8 4500 214 630 8 3220 211 379 1 1 2 38 1 211 5 212 0 9 10 2 540 9 4500 240 030 9 3220 236 779 1 1 2 38 1 236 9 237 4 10 10 2 540 10 4500 265 430 10 3220 262 179 1 5 8 41 3 262 3 262 8 11 8 3 175 11 4500 290 830 11 2900 286 766 1 5 8 41 3 287 0 287 6 12 8 3 175 12 4500 316 230 12 2900 312 166 1 5 8 41 3 312 4 313 0 13 8 3 175 13 6800 347 472 13 5200 343 408 1 5 8 41 3 343 6 344 2 14 8 3 175 14 6800 372 872 14 5200 368 808 1 3 4 44 5 369 0 369 6 15 8 3 175 15 6800 398 272 15 5200 394 208 1 3 4 44 5 394 4 395 0 16 8 3 175 16 6800 423 672 16 5200 419 608 1 7 8 47 6 419 8 420 4 17 8 3 175 17 6800 449 072 17 5200 445 008 2 50 8 445 2 445 8 18 8 3 175 18 6800 474 472 18 5200 470 408 2 50 8 470 6 471 2 These standard pipe threads are formally referred to by the following sequence of blocks the words Pipe thread the document number of the standard e g ISO 7 or EN 10226 the symbol for the pipe thread type G external and internal parallel ISO 228 R external taper ISO 7 Rp internal parallel ISO 7 1 Rc internal taper ISO 7 Rs external parallel the thread size Threads are normally right hand For left hand threads the letters LH are appended Example Pipe thread EN 10226 Rp 2 1 2The terminology for the use of G and R originated from Germany G for gas as it was originally designed for use on gas pipes R for rohr meaning pipe Pipe and fastener dimensions editG Rsize Typ nut sizes Corresponding pipe DN OD Wall in mm mm mm mm 1 16 3 1 8 15 6 10 2 2 1 4 19 8 13 5 2 3 3 8 22 or 23 10 17 2 2 3 1 2 27 15 21 3 2 6 3 4 32 20 26 9 2 6 1 43 25 33 7 3 2 1 1 4 53 32 42 4 3 2 1 1 2 57 40 48 3 3 2 2 70 50 60 3 3 6 2 1 2 65 76 1 3 6 3 80 88 9 4 4 100 114 3 4 5 5 125 139 7 5 6 150 168 3 5ISO 7 Pressure Tight threads editThe standard ISO 7 Pipe threads where pressure tight joints are made on the threads consists of the following parts ISO 7 1 1994 Dimensions tolerances and designation ISO 7 2 2000 Verification by means of limit gaugesISO 228 Non Pressure Tight Threads editThe standard ISO 228 Pipe threads where pressure tight joints are not made on the threads consists of the following parts ISO 228 1 2000 Dimensions tolerances and designation ISO 228 2 1987 Verification by means of limit gaugesSee also editAN thread British standard brass thread British Standard Whitworth Garden hose thread National pipe thread Panzergewinde Thread angle Threaded pipeReferences edit BSPM British Standard Pipe Mechanical Retrieved 14 July 2016 Pipe Thread Types and Designations PDF Archived from the original PDF on 2013 10 07 Retrieved 2013 12 27 maryland metrics Maryland Metrics thread data charts Archived from the original on 24 July 2018 Retrieved 14 July 2016 RoyMech Pipe Threads Archived from the original on 22 July 2018 Retrieved 14 July 2016 How to ID British BSP Threads PDF Retrieved 20 November 2017 BSP Thread data www practicalmachinist com 2 May 2012 Retrieved 2016 07 15 External links editBritish Standard Pipe Parallel Thread Dimensions British Standard Pipe Taper Thread Dimensions Archived 2017 09 27 at the Wayback Machine BSP Thread Charts and Diagrams showing dimensions of tubing and fittings ISO 7 1 1994 ISO 7 2 2000 ISO 228 1 2000 ISO 228 2 1987 Parallel pipe threads G Parallel pipe threads PF Retrieved from https en wikipedia org w index php title British Standard Pipe amp oldid 1221407986 ISO 228, wikipedia, wiki, book, books, library,
