文章目录BSP螺纹是什么意思BSP螺纹全称是British Standard Pipe Thread，指的是英国标准管螺纹，属于惠氏螺纹（BS 84）范畴。说到惠氏螺纹，私以为甚是了不起，不仅仅因为它是世界上第一个螺纹标准，更因为它的提出者（）。感兴趣的朋友可以自行百度或者维基百科，这里不多作介绍。BSP螺纹按外形分为两种：圆柱管螺纹BSPP（British Standard Pipe Parallel）和圆锥管螺纹BSPT（British Standard Pipe Taper）。前面说过，BSP螺纹属于惠氏螺纹的一种，故牙型角为55°，如下图示：英制圆柱管螺纹BSPP（British Standard Pipe Parallel）BSPP - 英制圆柱管螺纹。网上有的直译成平行管螺纹，博主觉得有点不妥。与之对应的另外一种管螺纹叫“圆锥管螺纹”，这个是约定俗成的叫法，也是教科书上的标准称呼。若将British Standard Pipe Parallel翻译成“平行管螺纹”则可能会让人觉得有点摸不到头脑，且不够专业。历史上的原因，BSPP同时又有其他不同的称呼。常见的如BSPF（British Standard Pipe Fitting）、BSPM（British Standard Pipe Mechanical）和PS（British Standard Pipe Straight）等。然而，随着后来ISO标准化的开始，这些五花八样的称呼统统用一个简单明了的字母代替了。这就是G螺纹。于是：G = BSPP = BSPF = BSPM = PS = ……字母G是Gas的缩写（一说是源于德语Gewinde，“螺纹”的意思，博主个人比较倾向于前者），因为起初是在煤气管道上用的。而我们之所以称G为管螺纹，是因为G和管（Guan）的拼音首字母相同的缘故，这实在是一个巧合。G螺纹分内、外两种螺纹，用于非密封联接。执行标准是BS EN ISO 228-1，旧标准是BS 2779，现已作废。另外，有关标准的几个常见版本的含义：ISO-xxx = International Standard = 国际标准EN-ISO-xxx = European version of the International Standard = 欧版国际标准BS-EN-ISO-xxx = British version of the European version of the International Standard = 英版的欧版国际标准如有需要，以上提到的螺纹标准可（PDF格式）。常用BSPP/BSPF螺纹规格尺寸表常用BSPP/BSPF螺纹规格尺寸表标记 尺寸 类别大径 mm d=D螺距 mm p牙数 TPI 中径 mm d2=D2外螺纹 小径 d3牙高 mm H1底孔 mm G1/8
1/8" BSPP 9.728 0.907 28 9.147 8.566 0.581 8.70 G1/4
1/4" BSPP 13.157 1.337 19 12.301 11.445 0.856 11.60 G3/8
3/8" BSPP 16.662 1.337 19 15.806 14.950 0.856 15.00 G1/2
1/2" BSPP 20.955 1.814 14 19.793 18.631 1.162 19.00 G5/8
5/8" BSPP 22.911 1.814 14 21.749 20.587 1.162 20.75 G3/4
3/4" BSPP 26.441 1.814 14 25.279 24.117 1.162 24.50 G7/8
7/8" BSPP 30.201 1.814 14 29.039 27.877 1.162 28.00 G1
1" BSPP 33.249 2.309 11 31.770 30.291 1.479 30.50 G1-1/8
1-1/8" BSPP 37.897 2.309 11 36.418 34.939 1.479 35.00 G1-1/4
1-1/4" BSPP 41.910 2.309 11 40.431 38.952 1.479 39.50G1-3/8 1-3/8" BSPP
44.323 2.309 11 42.844 41.365 1.479 41.50 G1-1/2
1-1/2" BSPP 47.803 2.309 11 46.324 44.845 1.479 45.00 G1-3/4
1-3/4" BSPP 53.746 2.309 11 52.267 50.788 1.479 51.00 G2
2" BSPP 59.614 2.309 11 58.135 56.656 1.479 57.00 G2-1/4
2-1/4" BSPP 65.71 2.309 11 64.231 62.752 1.479 63.00 G2-1/2
2-1/2" BSPP 75.184 2.309 11 73.705 72.226 1.479 72.50 G2-3/4
2-3/4" BSPP 81.534 2.309 11 80.055 78.576 1.479 79.003
3" BSPP 87.884 2.309 11 86.405 84.926 1.479 85.50 G3-1/4
3-1/4" BSPP 93.98 2.309 11 92.501 91.022 1.479 91.00 G3-1/2
3-1/2" BSPP 100.33 2.309 11 98.351 97.372 1.479 97.75 G3-3/4
3-3/4" BSPP 106.68 2.309 11 105.201 103.722 1.479 104.00 G4
4" BSPP 113.03 2.309 11 111.55 110.072 1.479 110.50 G4-1/2
4-1/2" BSPP 125.73 2.309 11 124.251 122.772 1.479 123.00G5 5" BSPP 138.43 2.309 11 136.951 135.472 1.479 136.00 G5-1/2
5-1/2" BSPP 151.13 2.309 11 149.651 148.172 1.479 148.50 G6
6" BSPP 163.83 2.309 11 162.351 160.872 1.479 161.50如需要下载保存，可点此下载PNG格式图片：英制圆锥管螺纹BSPT（British Standard Pipe Taper）BSPT - 英制圆锥管螺纹，又称PT螺纹，只用于一般密封联接。BSPT旧标准为BS 21，而在新标准BS EN 10226-1中，用R螺纹替代。于是：R = BSPT = PT = ……字母R来源于德语rohr，意思是“管”。R螺纹实际是一个系列，常见的有Rp、Rs、Rc、R1和R2。具体如下：Rp - 英制密封圆柱内螺纹Rs - 英制密封圆柱外螺纹Rc - 英制密封圆锥内螺纹R1 - 英制密封圆锥外螺纹，与Rp配合使用，即Rp/R1“柱/锥”配合R2 - 英制密封圆锥外螺纹，与Rc配合使用，即Rc/R2“锥/锥”配合由此可见，一般密封英制管螺纹分为两种：圆柱管螺纹和圆锥管螺纹。密封用圆柱管螺纹（Rp）设计牙型与非密封管螺纹G完全一致，不同之处在于螺纹精度。而密封用圆锥管螺纹（R）则在圆柱管螺纹基础上按1:16的锥度进行技术转化。其设计牙型如下图示：常用BSPT/R螺纹规格尺寸表 常用BSPT/R螺纹规格尺寸表尺寸牙数 TPI螺距 mmP牙高 mmh基准直径 mmD=d中径 mmD2=d2小径 mmD1=d1基准距离 mm极限偏差 T1/2mm有效螺纹长度 mm装配余量 mm内螺纹直径极限偏差 T1/2mm1/16280,9070,5817,7237,1426,5614+ /- 0,96,52,5+ /-0,0711/8280,9070,5819,7289,1478,5664+ /- 0,96,52,5+ /-0,0711/4191,3370,85613,15712,30111,4456+ /- 1,39,73,7+ /-0,1043/8191,3370,85616,66215,80614,956,4+ /- 1,310,13,7+ /-0,1041/2141,8141,16220,95519,79318,6318,2+ /- 1,813,25,0+ /-0,1043/4141,8141,16226,41125,27924,1179,5+ /- 1,814,55,0+ /-0,1041112,3091,47933,24931,7730,29110,4+ /- 2,316,86,4+ /-0,1801 1/4112,3091,47941,9140,43138,95212,7+ /- 2,319,16,4+ /-0,1801 1/2112,3091,47947,80346,32444,84512,7+ /- 2,319,16,4+ /-0,1802112,3091,47959,61458,13556,65615,9+ /- 2,323,47,5+ /-0,1802 1/2112,3091,47975,18473,70572,22617,5+ /- 3,526,79,2+ /-0,216 3112,3091,47987,88486,40584,92620,6+ /- 3,529,89,2+ /-0,2164112,3091,479113,03111,551110,07225,4+ /- 3,535,810,4+ /-0,2165112,3091,479138,43136,951135,47228,6+ /- 3,540,111,5+ /-0,2166112,3091,479163,83162,351160,87228,6+ /- 3,540,111,5+ /-0,216如需要下载保存，可点此下载PNG格式图片：值得一提的是，很多朋友认为BSP螺纹指的就是G螺纹，并可以相互通用，对于这种说法博主则有不同的看法。一般密封用圆柱管螺纹（Rp）的密封效果必要时是通过在整个螺纹中添加密封填充物（如：聚四氟乙烯密封带）来实现的，而非密封用圆柱管螺纹（G）的密封效果则是通过在螺纹联接的两端或其周围使用密封设备（如：O型密封环）来实现。不仅如此，一般密封用管螺纹螺纹与非密封用管螺纹的用途及设计公差也有区别，具体可参看。实际上，不少机械加工企业在加工BSP螺纹时通常会遇到螺纹环塞规检验均合格但配合起来就是密封不良的情况的主要原因就在于混淆了密封用Rp内螺纹与非密封用G内螺纹。与BSP螺纹有关的一些螺纹代号及标准：G - 英制圆柱管螺纹（标准：BS 2779、BS EN ISO 228-1、ISO 7-1）BSPP - 英制圆柱管螺纹（标准：BS 2779、BS EN ISO 228-1、ISO 7-1）BSPT - 英制圆锥管螺纹（标准：BS 21、BS EN 10226-1、 ISO 7-1）R（Rp、Rs、Rc、R1、R2） - 英制圆锥管螺纹（标准：BS 21、BS EN 10226-1、 ISO 7-1、DIN 2999）需要更多更详实的信息？建议。BSP螺纹分类关系图为更直观的表示BSP螺纹的分类及关系，也为了方便查阅，博主特意做了一个“BSP螺纹分类关系图”（如下）。从图中可以轻松看出BSP螺纹和G螺纹的区别和联系。需要的朋友可免费下载分享，但转载请务必注明出处或本文链接。BSP螺纹相关标准下载请在下面输入你的常用邮箱，免费下载BSP螺纹相关标准(PDF格式)，如BS-84、BS-21、BS-2779、BS-EN-ISO-228-1及ISO7-1等。友情提示：某些免费邮箱可能会设置拦截限制。如收件箱里查收不到，请检查垃圾邮件并添加为白名单。 我比你更痛恨垃圾邮件，只有真实的邮箱才能成功接收下载链接。
你好，BSP螺纹分类关系图能发一下邮箱么，电脑不显示，O(∩_∩)O谢谢* 如不需要，请点击页面空白处退出{"cookieName":"wBounce","isAggressive":false,"isSitewide":true,"hesitation":"","openAnimation":"swing","exitAnimation":"zoomOut","timer":"","sensitivity":"15","cookieExpire":"1","cookieDomain":"","autoFire":"","isAnalyticsEnabled":false}百度拇指医生
&&&普通咨询
您的网络环境存在异常，
请输入验证码
验证码输入错误，请重新输入From Wikipedia, the free encyclopedia
Time period
~-300 to present
Descendants
Transliteration equivalents
Variations
Other letters commonly used with
G ( gee ) is the 7th
The letter 'G' was introduced in the
as a variant of '' to distinguish voiced /ɡ/ from voiceless /k/. The recorded originator of 'G' is freedman , the first Roman to open a fee-paying school, who taught around 230 BC. At this time, '' had fallen out of favor, and 'C', which had formerly represented both /ɡ/ and /k/ before open vowels, had come to express /k/ in all environments.
Ruga's positioning of 'G' shows that
related to the letters' values as
was a concern even in the 3rd century BC. According to some records, the original seventh letter, 'Z', had been purged from the Latin alphabet somewhat earlier in the 3rd century BC by the
, who found it distasteful and foreign. Sampson (1985) suggests that: "Evidently the order of the alphabet was felt to be such a concrete thing that a new letter could be added in the middle only if a 'space' was created by the dropping of an old letter."
(1899) proposes that there never was such a "space" in the alphabet and that in fact 'G' was a direct descendant of . Zeta took shapes like ? the development of the
form 'G' from this shape would be exactly parallel to the development of 'C' from . He suggests that the pronunciation /k/ & /ɡ/ was due to contamination from the also similar-looking 'K'.
Eventually, both
/k/ and /ɡ/ developed
consequently in today's , ?c? and ?g? have different sound values depending on context (known as
and ). Because of
influence,
shares this feature.
include a double-storey and single-storey g.
The modern
'g' has two typographic variants: the single-storey (sometimes opentail) '' and the double-storey (sometimes looptail) ''. The single-storey form derives from the majuscule (uppercase) form by raising the
that distinguishes it from 'c' to the top of the loop, thus closing the loop, and extending the vertical stroke downward and to the left. The double-storey form (g) had developed similarly, except that some ornate forms then extended the tail back to the right, and to the left again, forming a closed
or loop. The initial extension to the left was absorbed into the upper closed bowl. The double-storey version became popular when printing switched to "" because the tail was effectively shorter, making it possible to put more lines on a page. In the double-storey version, a small top stroke in the upper-right, often terminating in an orb shape, is called an "ear".
Generally, the two forms are complementary, but occasionally the difference has been exploited to provide contrast. In the , opentail ?ɡ? has always represented a , while ?? was distinguished from ?ɡ? and represented a
from 1895 to 1900. In 1948, the Council of the
recognized ?ɡ? and ?? as typographic equivalents, and this decision was reaffirmed in 1993. While the 1949 Principles of the International Phonetic Association recommended the use of ?? for a velar plosive and ?ɡ? for an advanced one for languages where it is preferable to distinguish the two, such as Russian, this practice never caught on. The 1999 Handbook of the International Phonetic Association, the successor to the Principles, abandoned the recommendation and acknowledged both shapes as acceptable variants.
Wong et al. (2018) found that native English speakers have little conscious awareness of the looptail 'g' (). They write: "Despite being questioned repeatedly, and despite being informed directly that G has two lowercase print forms, nearly half of the participants failed to reveal any knowledge of the looptail 'g', and only 1 of the 38 participants was able to write looptail 'g' correctly."
In English, the letter appears either alone or in some . Alone, it represents
(/ɡ/ or "hard" ?g?), as in goose, gargoyle and game;
(/d??/ or "soft" ?g?), generally before ?i? or ?e?, as in giant, ginger and geology; or
(/?/) in some words of French origin, such as rouge, beige and genre.
In words of Romance origin, ?g? is mainly soft before ?e? (including the digraphs ?ae? and ?oe?), ?i?, or ?y?, and hard otherwise. Soft ?g? is also used in many words that came into English through medieval or modern Romance languages from languages without soft ?g? (like Ancient Latin and Greek) (e.g.
or ). There are many English words of non-Romance origin where ?g? is hard though followed by ?e? or ?i? (e.g. get, gift), and a few in which ?g? is soft though followed by ?a? such as
The double consonant ?? has the value /ɡ/ (hard ?g?) as in nugget, with very few exceptions: /ɡd??/ in suggest and /d??/ in exaggerate and veggies.
The digraph ?? has the value /d??/ (soft ?g?), as in badger. Non-digraph ?dg? can also occur, in compounds like floodgate and headgear.
The digraph ?? may represent
() as in length, singer
the latter followed by hard ?g? (/?ɡ/) as in jungle, finger, longest
Non-digraph ?ng? also occurs, with possible values
/nɡ/ as in engulf, ungainly
/nd??/ as in sponge, angel
/n?/ as in melange
The digraph ?? (in many cases a replacement for the obsolete letter , which took various values including /ɡ/, /?/, /x/ and /j/) may represent
/ɡ/ as in ghost, aghast, burgher, spaghetti
/f/ as in cough, laugh, roughage
? (no sound) as in through, neighbor, night
/p/ in hiccough
/x/ in ugh
Non-digraph ?gh? also occurs, in compounds like foghorn, pigheaded
The digraph ?? may represent
/n/ as in gnostic, deign, foreigner, signage
/nj/ in loanwords like champignon, lasagna
Non-digraph ?gn? also occurs, as in signature, agnostic
The trigraph ?ngh? has the value /?/ as in gingham or dinghy. Non-trigraph ?ngh? also occurs, in compounds like stronghold and dunghill.
Most Romance languages and some Nordic languages also have two main pronunciations for ?g?, hard and soft. While the soft value of ?g? varies in different Romance languages (/?/ in French and , [(d)?] in , /d??/ in Italian and Romanian, and /x/ in most dialects of Spanish), in all except Romanian and Italian, soft ?g? has the same pronunciation as the ?j?.
In Italian and Romanian, ?gh? is used to represent /ɡ/ before front vowels where ?g? would otherwise represent a soft value. In Italian and French, ?? is used to represent the
/?/, a sound somewhat similar to the ?ny? in English canyon. In Italian, the
?gli?, when appearing before a vowel or as the article and pronoun , represents the
Other languages typically use ?g? to represent /ɡ/ regardless of position.
Amongst European languages ,
are an exception as they do not have /ɡ/ in their native words. In
?g? represents a
/?/ instead, a sound that does not occur in modern English, but there is a dialectal variation: many Netherlandic dialects use a voiceless fricative ([x] or [χ]) instead, and in southern dialects it may be palatal [?]. Nevertheless, word-finally it is always voiceless in all dialects, including the standard Dutch of Belgium and the Netherlands. On the other hand, some dialects (like Amelands), may have a phonemic /ɡ/.
uses ?g? to represent /d?/, in addition to /ɡ/, and also uses it to indicate a .
In Maori (), ?g? is used in the digraph ?ng? which represents the
/?/ and is pronounced like the ?ng? in singer.
orthographies, ?g? was used to represent /j/, while /ɡ/ was written as ??? (?g? with ).
letter , from which the following symbols originally derive
C c : Latin letter , from which G derives
Γ γ :
letter , from which C derives in turn
ɡ: Latin letter
 : Modifier letter small script g is used for phonetic transcription
Г г :
? ? : Latin letter
? ? : Latin letter
? ? :
? ? : Turned insular g
? : Latin letter small capital G, used in the International Phonetic Alphabet to represent a
? : Latin letter small capital G with hook, used in the International Phonetic Alphabet to represent a
? ? : Modifier letters are used in the
? : Used for the
phonetic transcription system
Unicode name
LATIN CAPITAL LETTER G
LATIN SMALL LETTER G
LATIN SMALL LETTER SCRIPT G
1 Also for encodings based on ASCII, including the DOS, Windows, ISO-8859 and Macintosh families of encodings.
The American Heritage Dictionary of the English Language. 1976.
Hempl, George (1899). "The Origin of the Latin Letters G and Z". Transactions and Proceedings of the American Philological Association. The Johns Hopkins University Press. 30: 24–41. :.  .
Association phonétique internationale (January 1895). "v?t syr l alfab?" [Votes sur l'alphabet]. Le Ma?tre Phonétique: 16–17.
Association phonétique internationale (February–March 1900a). "akt ?fisj?l" [Acte officiel]. Le Ma?tre Phonétique: 20.
Jones, Daniel (January–June 1948). "desizj?? ofisj?l" [Décisions officielles]. Le Ma?tre Phonétique (89): 28–31.
International Phonetic Association (1993). "Council actions on revisions of the IPA". Journal of the International Phonetic Association. 23 (1): 32–34. :.
International Phonetic Association (1949). The Principles of the International Phonetic Association. Department of Phonetics, University College, London. Supplement to Le Ma?tre Phonétique 91, January–June 1949. Reprinted in Journal of the International Phonetic Association 40 (3), December 2010, pp. 299–358, :.
Wells, John C. (6 November 2006). . John Wells’s phonetic blog. Department of Phonetics and Linguistics, University College London.
International Phonetic Association (1999). Handbook of the International Phonetic Association: A Guide to the Use of the International Phonetic Alphabet. Cambridge University Press. p. 19.  .
Wong, K Wadee, F Ellenblum, G McCloskey, Michael (2 April 2018). . Journal of Experimental Psychology: Human Perception and Performance. : 2018.
Dean, Signe. . Science Alert 2018.
Constable, Peter ().
; et al. ().
Everson, M Dicklberger, A Pentzlin, K Wandl-Vogt, Eveline ().
Media related to
at Wikimedia Commons
The dictionary definition of
at Wiktionary
The dictionary definition of
at Wiktionary
Letter G with
: Hidden categories:Loading...
反馈文档意见
华为采用机器翻译与人工审校相结合的方式将此文档翻译成不同语言，希望能帮助您更容易理解此文档的内容。 请注意：即使是最好的机器翻译，其准确度也不及专业翻译人员的水平。 华为对于翻译的准确性不承担任何责任，并建议您参考英文文档（已提供链接）。
反馈文档意见
视频加载中…
（需要安装HedEx Lite）
您需要下载安装最新版本的HedEx Lite，安装完成后请重启浏览器
或将当前使用的HedEx Lite升级到最新版本
复制下载链接百度拇指医生
&&&普通咨询
您的网络环境存在异常，
请输入验证码
验证码输入错误，请重新输入