方钻杆是整个钻柱的驱动部分，分四方钻杆和六方钻杆两种，采用AISI 4145H合金钢制造，执行API规范及SY/T 6509标准，材料经整体热处理，在全长范围内可获得优良的力学性能，可对螺纹进行冷滚压、镀铜或磷化处理。 表：技术规格及参数规格in上部内螺纹接头下部外螺纹接头内径(mm)驱动部分(mm)螺纹类型(LH)外径(mm)螺纹类型(LH)四方六方对边宽四方对角宽六方对角宽标准选用标准选用四方外径(mm)六方外径(mm)2 1/26 5/8REG4 1/2REG196.8146.0NC2685.7  31.8 63.583.3 36 5/8REG4 1/2REG196.8146.0NC31104.8NC2685.744.431.876.2100.085.73 1/26 5/8REG4 1/2REG196.8146.0NC38120.6NC31104.857.244.488.9115.1100.84 1/46 5/8REG4 1/2REG196.8146.0NC46158.8NC38120.671.457.2108.0141.3122.26 5/8REG4 1/2REG196.8146.0NC50161.9NC38120.671.457.2108.0141.3122.25 1/46 5/8REG 196.8 5 1/2FH177.8NC46158.882.676.2133.3175.4151.66 5/8REG 196.8 NC56177.8NC50161.982.682.6133.3175.4151.666 5/8REG 196.8   5 1/2FH177.8 88.9152.4 1736 5/8REG 196.8   NC56177.8 88.9152.4 173