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　　自(zi)攻(gong)(gong)螺(luo)(luo)套按照(zhao)結構可劃分為兩種(zhong)：一字開(kai)槽型(xing)和(he)三圓(yuan)(yuan)孔(kong)(kong)型(xing)，其中三圓(yuan)(yuan)孔(kong)(kong)型(xing)的(de)又分為307型(xing)和(he)308型(xing)兩種(zhong)，結構相同、長度(du)不(bu)(bu)同。其中開(kai)槽型(xing)自(zi)攻(gong)(gong)螺(luo)(luo)套被(bei)推薦應用(yong)(yong)于大(da)多數(shu)應用(yong)(yong)領(ling)域(yu)。在(zai)某些(xie)材料(liao)(liao)上(shang)，這種(zhong)螺(luo)(luo)套提(ti)供**的(de)特定(ding)螺(luo)(luo)紋(wen)(wen)鎖功效。當材料(liao)(liao)厚度(du)不(bu)(bu)太寬裕的(de)時候可以(yi)(yi)選用(yong)(yong)三圓(yuan)(yuan)孔(kong)(kong)型(xing)自(zi)攻(gong)(gong)螺(luo)(luo)套，此結構的(de)自(zi)攻(gong)(gong)螺(luo)(luo)套具有(you)(you)較(jiao)厚的(de)壁，并且易于切(qie)削。無(wu)論是哪(na)種(zhong)結構的(de)自(zi)攻(gong)(gong)螺(luo)(luo)套都具有(you)(you)“自(zi)攻(gong)(gong)”特點，安(an)裝無(wu)需(xu)用(yong)(yong)絲錐加工底(di)孔(kong)(kong)螺(luo)(luo)紋(wen)(wen)，只需(xu)預鉆底(di)孔(kong)(kong)后用(yong)(yong)安(an)裝工具將其直接旋入(ru)，安(an)裝效率(lv)高、使用(yong)(yong)方便。 兩款自(zi)攻(gong)(gong)型(xing)螺(luo)(luo)套襯(chen)套內(nei)外都有(you)(you)牙紋(wen)(wen)，嵌入(ru)塑料(liao)(liao)、鋁合金、鑄鐵、銅(tong)等較(jiao)軟材料(liao)(liao)內(nei)，可以(yi)(yi)形成較(jiao)高強度(du)的(de)內(nei)螺(luo)(luo)紋(wen)(wen)孔(kong)(kong)，亦可對已壞損(sun)的(de)內(nei)螺(luo)(luo)紋(wen)(wen)進行修復。