1. 短節是(shi)長度小于(yu)12in（0.3m）、兩端(duan)或(huo)一(yi)端(duan)有螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen)并便于(yu)進行焊接(jie)或(huo)機械連接(jie)的(de)(de)一(yi)段管(guan)(guan)(guan)子。當長度在12in（0.3m）以上(shang)時(shi)，則(ze)稱為短管(guan)(guan)(guan)。普通(tong)類型的(de)(de)短節是(shi)全(quan)外(wai)牙(ya)型，螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen)接(jie)口的(de)(de)長度大約為標(biao)準管(guan)(guan)(guan)螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen)的(de)(de)2倍，且(qie)(qie)沒有肩部。任何長度的(de)(de)帶肩螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen)管(guan)(guan)(guan)接(jie)頭的(de)(de)兩個管(guan)(guan)(guan)螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen)間(jian)有肩部；短管(guan)(guan)(guan)螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen)管(guan)(guan)(guan)接(jie)頭是(shi)比全(quan)外(wai)牙(ya)型螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen)管(guan)(guan)(guan)接(jie)頭稍長的(de)(de)帶肩螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen)管(guan)(guan)(guan)接(jie)頭，且(qie)(qie)對(dui)于(yu)不同管(guan)(guan)(guan)徑的(de)(de)管(guan)(guan)(guan)子的(de)(de)特(te)定(ding)長度均(jun)要符合制造(zao)商標(biao)準。短節外(wai)形見(jian)圖16.29。

   2. 變(bian)(bian)徑(jing)短(duan)接(jie)(jie)管(guan)(guan)(guan)(guan)（圖16.30）也稱異(yi)形短(duan)節、漸縮管(guan)(guan)(guan)(guan)，與大(da)小(xiao)頭（異(yi)徑(jing)管(guan)(guan)(guan)(guan)）相同(tong)，用以減(jian)小(xiao)管(guan)(guan)(guan)(guan)線(xian)口徑(jing)。變(bian)(bian)徑(jing)短(duan)接(jie)(jie)管(guan)(guan)(guan)(guan)可設計(ji)為螺紋連(lian)接(jie)(jie)或者承(cheng)插(cha)焊(han)連(lian)接(jie)(jie)。變(bian)(bian)徑(jing)短(duan)接(jie)(jie)管(guan)(guan)(guan)(guan)和異(yi)徑(jing)管(guan)(guan)(guan)(guan)一樣有(you)同(tong)心和偏心之分。變(bian)(bian)徑(jing)短(duan)接(jie)(jie)管(guan)(guan)(guan)(guan)大(da)端(duan)及小(xiao)端(duan)分別有(you)平端(duan)、坡(po)口端(duan)、錐管(guan)(guan)(guan)(guan)外螺紋端(duan)三種(zhong)，大(da)、小(xiao)端(duan)不同(tong)組合(he)可獲(huo)得九(jiu)種(zhong)配合(he)。