1. 短(duan)(duan)節是長度(du)(du)(du)小于(yu)12in（0.3m）、兩端(duan)或一端(duan)有(you)(you)螺(luo)(luo)紋(wen)(wen)并便于(yu)進行焊(han)接或機械連接的(de)一段管(guan)子。當長度(du)(du)(du)在(zai)12in（0.3m）以上時，則稱為短(duan)(duan)管(guan)。普通(tong)類(lei)型(xing)(xing)的(de)短(duan)(duan)節是全(quan)外(wai)牙型(xing)(xing)，螺(luo)(luo)紋(wen)(wen)接口的(de)長度(du)(du)(du)大約(yue)為標準管(guan)螺(luo)(luo)紋(wen)(wen)的(de)2倍，且沒有(you)(you)肩(jian)部。任何長度(du)(du)(du)的(de)帶(dai)肩(jian)螺(luo)(luo)紋(wen)(wen)管(guan)接頭(tou)(tou)的(de)兩個管(guan)螺(luo)(luo)紋(wen)(wen)間有(you)(you)肩(jian)部；短(duan)(duan)管(guan)螺(luo)(luo)紋(wen)(wen)管(guan)接頭(tou)(tou)是比全(quan)外(wai)牙型(xing)(xing)螺(luo)(luo)紋(wen)(wen)管(guan)接頭(tou)(tou)稍(shao)長的(de)帶(dai)肩(jian)螺(luo)(luo)紋(wen)(wen)管(guan)接頭(tou)(tou)，且對(dui)于(yu)不同管(guan)徑的(de)管(guan)子的(de)特定長度(du)(du)(du)均(jun)要符合制造(zao)商標準。短(duan)(duan)節外(wai)形見圖16.29。

   2. 變(bian)(bian)(bian)徑(jing)短接(jie)管(guan)(guan)(guan)(guan)（圖16.30）也(ye)稱(cheng)異形短節、漸縮管(guan)(guan)(guan)(guan)，與大(da)(da)小(xiao)頭（異徑(jing)管(guan)(guan)(guan)(guan)）相同(tong)，用以減(jian)小(xiao)管(guan)(guan)(guan)(guan)線口徑(jing)。變(bian)(bian)(bian)徑(jing)短接(jie)管(guan)(guan)(guan)(guan)可設計(ji)為螺(luo)紋連接(jie)或(huo)者承(cheng)插(cha)焊連接(jie)。變(bian)(bian)(bian)徑(jing)短接(jie)管(guan)(guan)(guan)(guan)和異徑(jing)管(guan)(guan)(guan)(guan)一樣有(you)同(tong)心(xin)(xin)和偏心(xin)(xin)之分(fen)。變(bian)(bian)(bian)徑(jing)短接(jie)管(guan)(guan)(guan)(guan)大(da)(da)端(duan)及小(xiao)端(duan)分(fen)別有(you)平端(duan)、坡口端(duan)、錐管(guan)(guan)(guan)(guan)外螺(luo)紋端(duan)三種，大(da)(da)、小(xiao)端(duan)不同(tong)組合可獲(huo)得九種配合。