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 links


Types[edit] 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. BSPT Pipe 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. (International standards require all female threads to be parallel.) 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[edit] The 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


Pipe thread sizes[edit] 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 to 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 / R size Thread pitch Major diameter Minor diameter Gauge length 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 .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 .3214 8.2 18.7 19.1 ​5⁄8 14 1.814 0.9020 22.911 0.8105 20.587 .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 .4091 10.4 30.4 30.9 ​1 1⁄8 11 2.309 1.4920 37.897 1.3756 34.939 .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 2½ 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 dimensions[edit] 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 6 150 165.1 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


See also[edit] AN thread British standard brass thread British Standard Whitworth Garden hose thread National pipe thread Panzergewinde Thread angle Threaded pipe


References[edit] ^ "BSPM = British Standard Pipe Mechanical". Retrieved 14 July 2016.  ^ "Archived copy" (PDF). Archived from the original (PDF) on 2013-10-07. Retrieved 2013-12-27.  ^ maryland metrics. "Maryland Metrics thread data charts". Retrieved 14 July 2016.  ^ "RoyMech: Pipe Threads". Retrieved 14 July 2016.  ^ "How to ID British (BSP) Threads" (PDF). Retrieved 20 November 2017.  ^ "BSP Thread data". www.practicalmachinist.com. Retrieved 2016-07-15. 


External links[edit] British Standard Pipe Parallel Thread Dimensions British Standard Pipe Taper Thread Dimensions ISO 7-1:1994 ISO 7-2:2000 ISO 228-1:2000 ISO 228-2:1987 v t e ISO standards by standard number List of ISO standards / ISO romanizations / IEC standards 1–9999 1 2 3 4 5 6 7 9 16 31 -0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 128 216 217 226 228 233 259 269 302 306 428 518 519 639 -1 -2 -3 -5 -6 646 690 732 764 843 898 965 1000 1004 1007 1073-1 1413 1538 1745 1989 2014 2015 2022 2047 2108 2145 2146 2240 2281 2709 2711 2788 2848 2852 3029 3103 3166 -1 -2 -3 3297 3307 3602 3864 3901 3977 4031 4157 4217 4909 5218 5428 5775 5776 5800 5964 6166 6344 6346 6385 6425 6429 6438 6523 6709 7001 7002 7098 7185 7200 7498 7736 7810 7811 7812 7813 7816 8000 8178 8217 8571 8583 8601 8632 8652 8691 8807 8820-5 8859 -1 -2 -3 -4 -5 -6 -7 -8 -8-I -9 -10 -11 -12 -13 -14 -15 -16 8879 9000/9001 9075 9126 9293 9241 9362 9407 9506 9529 9564 9594 9660 9897 9899 9945 9984 9985 9995 10000–19999 10005 10006 10007 10116 10118-3 10160 10161 10165 10179 10206 10218 10303 -11 -21 -22 -28 -238 10383 10487 10585 10589 10646 10664 10746 10861 10957 10962 10967 11073 11170 11179 11404 11544 11783 11784 11785 11801 11898 11940 (-2) 11941 11941 (TR) 11992 12006 12182 12207 12234-2 13211 -1 -2 13216 13250 13399 13406-2 13450 13485 13490 13567 13568 13584 13616 14000 14031 14224 14289 14396 14443 14496 -2 -3 -6 -10 -11 -12 -14 -17 -20 14644 14649 14651 14698 14750 14764 14882 14971 15022 15189 15288 15291 15292 15398 15408 15444 -3 15445 15438 15504 15511 15686 15693 15706 -2 15707 15897 15919 15924 15926 15926 WIP 15930 16023 16262 16612-2 16750 16949 (TS) 17024 17025 17100 17203 17369 17442 17799 18000 18004 18014 18245 18629 18916 19005 19011 19092 (-1 -2) 19114 19115 19125 19136 19439 19500 19501 19502 19503 19505 19506 19507 19508 19509 19510 19600:2014 19752 19757 19770 19775-1 19794-5 19831 20000+ 20000 20022 20121 20400 21000 21047 21500 21827:2002 22000 23270 23271 23360 24517 24613 24617 24707 25178 25964 26000 26300 26324 27000 series 27000 27001 27002 27006 27729 28000 29110 29148 29199-2 29500 30170 31000 32000 38500 40500 42010 55000 80000 -1 -2 -3 Category Retrieved from "https://en.wikipedia.org/w/index.php?title=British_Standard_Pipe&oldid=811263307" Categories: Thread standardsPipingPlumbingHidden categories: Use British English Oxford spelling from December 2011Pages using div col without cols and colwidth parameters


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