短(duan)節(jie)是(shi)長(chang)(chang)度小于12in（0.3m），兩端或一端有螺(luo)紋(wen)(wen)(wen)(wen)并便于進行焊(han)接(jie)(jie)或機械連(lian)接(jie)(jie)的一段(duan)管(guan)(guan)(guan)(guan)子(zi)。當長(chang)(chang)度在12in（0.3m）以(yi)上時(shi)，則(ze)被稱為短(duan)管(guan)(guan)(guan)(guan)（cut pipe）。普通(tong)類型(xing)的短(duan)節(jie)是(shi)全外(wai)(wai)牙(ya)型(xing)，螺(luo)紋(wen)(wen)(wen)(wen)接(jie)(jie)口的長(chang)(chang)度大約為標(biao)準(zhun)管(guan)(guan)(guan)(guan)螺(luo)紋(wen)(wen)(wen)(wen)的兩倍，且沒有肩(jian)(jian)(jian)部(bu)。任(ren)何長(chang)(chang)度的帶肩(jian)(jian)(jian)螺(luo)紋(wen)(wen)(wen)(wen)管(guan)(guan)(guan)(guan)接(jie)(jie)頭的兩個管(guan)(guan)(guan)(guan)螺(luo)紋(wen)(wen)(wen)(wen)間(jian)有肩(jian)(jian)(jian)部(bu)；短(duan)管(guan)(guan)(guan)(guan)螺(luo)紋(wen)(wen)(wen)(wen)管(guan)(guan)(guan)(guan)接(jie)(jie)頭是(shi)比全外(wai)(wai)牙(ya)型(xing)螺(luo)紋(wen)(wen)(wen)(wen)管(guan)(guan)(guan)(guan)接(jie)(jie)頭稍長(chang)(chang)的帶肩(jian)(jian)(jian)螺(luo)紋(wen)(wen)(wen)(wen)管(guan)(guan)(guan)(guan)接(jie)(jie)頭，且對于不同管(guan)(guan)(guan)(guan)徑的管(guan)(guan)(guan)(guan)子(zi)的特定長(chang)(chang)度均要符合(he)制造(zao)商標(biao)準(zhun)。長(chang)(chang)螺(luo)紋(wen)(wen)(wen)(wen)管(guan)(guan)(guan)(guan)接(jie)(jie)頭是(shi)比短(duan)節(jie)長(chang)(chang)的切成特定長(chang)(chang)度的短(duan)節(jie)。典型(xing)短(duan)節(jie)見圖4.6.15。

  ①. 變(bian)徑短(duan)(duan)接(jie)管（也稱異(yi)型(xing)短(duan)(duan)節，漸縮(suo)管）（swage）與大小(xiao)頭（異(yi)徑管）相(xiang)同，用以減小(xiao)管線(xian)口(kou)徑，但(dan)是變(bian)徑短(duan)(duan)接(jie)管可設計為螺紋或者(zhe)承插(cha)焊連接(jie)。螺紋變(bian)徑短(duan)(duan)接(jie)管有(you)陽螺紋（male threads 或者(zhe) external treads）。

  ②. 變徑短接管(guan)和(he)異徑管(guan)一樣有同心和(he)偏心。

  ③. 螺(luo)紋(wen)變(bian)徑短(duan)接管(guan)（screwed swage）有(you)(you)螺(luo)紋(wen)端(duan)(duan)（thread ends，TE），承插(cha)焊變(bian)徑短(duan)接管(guan)有(you)(you)平端(duan)(duan)（plain ends，TE），對(dui)焊變(bian)徑短(duan)接管(guan)有(you)(you)對(dui)焊坡口端(duan)(duan)（beveled ends，BE）。變(bian)徑短(duan)接管(guan)大端(duan)(duan)及小端(duan)(duan)分(fen)別有(you)(you)平端(duan)(duan)、坡口端(duan)(duan)、錐管(guan)外(wai)螺(luo)紋(wen)端(duan)(duan)三種：大、小端(duan)(duan)的各種組合(he)共計有(you)(you)九(jiu)種配合(he)可能，如(ru)表4.6.14所示(shi)。典型變(bian)徑短(duan)接管(guan)見(jian)圖4.6.16。