1. 短節(jie)(jie)是(shi)長度(du)(du)小于12in（0.3m）、兩端或一(yi)端有螺(luo)紋(wen)(wen)(wen)并便(bian)于進行焊接或機械連接的(de)(de)一(yi)段管(guan)(guan)(guan)子。當長度(du)(du)在12in（0.3m）以上時，則稱為短管(guan)(guan)(guan)。普(pu)通類(lei)型的(de)(de)短節(jie)(jie)是(shi)全外牙型，螺(luo)紋(wen)(wen)(wen)接口的(de)(de)長度(du)(du)大約為標準管(guan)(guan)(guan)螺(luo)紋(wen)(wen)(wen)的(de)(de)2倍(bei)，且沒有肩(jian)部。任何長度(du)(du)的(de)(de)帶肩(jian)螺(luo)紋(wen)(wen)(wen)管(guan)(guan)(guan)接頭的(de)(de)兩個管(guan)(guan)(guan)螺(luo)紋(wen)(wen)(wen)間有肩(jian)部；短管(guan)(guan)(guan)螺(luo)紋(wen)(wen)(wen)管(guan)(guan)(guan)接頭是(shi)比全外牙型螺(luo)紋(wen)(wen)(wen)管(guan)(guan)(guan)接頭稍(shao)長的(de)(de)帶肩(jian)螺(luo)紋(wen)(wen)(wen)管(guan)(guan)(guan)接頭，且對于不同管(guan)(guan)(guan)徑(jing)的(de)(de)管(guan)(guan)(guan)子的(de)(de)特(te)定長度(du)(du)均要符(fu)合制造商(shang)標準。短節(jie)(jie)外形見圖16.29。

   2. 變(bian)(bian)徑(jing)短(duan)(duan)接(jie)(jie)管(guan)(guan)(guan)（圖16.30）也稱異形短(duan)(duan)節、漸(jian)縮管(guan)(guan)(guan)，與大(da)(da)小(xiao)頭(tou)（異徑(jing)管(guan)(guan)(guan)）相(xiang)同，用以減小(xiao)管(guan)(guan)(guan)線(xian)口徑(jing)。變(bian)(bian)徑(jing)短(duan)(duan)接(jie)(jie)管(guan)(guan)(guan)可設計(ji)為螺(luo)紋(wen)連接(jie)(jie)或者承插焊連接(jie)(jie)。變(bian)(bian)徑(jing)短(duan)(duan)接(jie)(jie)管(guan)(guan)(guan)和(he)(he)異徑(jing)管(guan)(guan)(guan)一樣有(you)同心和(he)(he)偏心之分(fen)。變(bian)(bian)徑(jing)短(duan)(duan)接(jie)(jie)管(guan)(guan)(guan)大(da)(da)端(duan)(duan)及小(xiao)端(duan)(duan)分(fen)別(bie)有(you)平端(duan)(duan)、坡口端(duan)(duan)、錐(zhui)管(guan)(guan)(guan)外螺(luo)紋(wen)端(duan)(duan)三種(zhong)，大(da)(da)、小(xiao)端(duan)(duan)不(bu)同組合可獲(huo)得九種(zhong)配合。