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地质管材螺纹广义地说应包括所有井下钻具的连接螺纹。即：套管（及其接头）螺纹；岩心管（及其连接接头）螺纹；钻杆（及其接头）螺纹；钻头螺纹；扩孔器螺纹。目前，国内外广泛地以特殊梯形扣用于地质管材连接。其原因是：它与矩形扣相比较，特殊梯形扣能增大螺纹强度，便于加工，延长刀具寿命，增加密封面；与V型扣相比较，特殊梯形螺纹强度保持率高，耐磨，不易滑扣，易于拧卸。
Geological pipe thread in a broad sense, should include all the underground drilling tools connecting thread. Namely: casing (and its joints) thread; core pipe (and its connection joints) thread; drill pipe (and its joints) thread; bit thread; reamer thread. At present, a special trapezoidal buckle widely used at home and abroad for geological pipe connection. The reason is: Compared with the rectangular buckle, the special trapezoidal buckle can increase the thread strength, easy to process, extend the tool life and increase the sealing surface; compared with the V-shaped buckle, the special trapezoidal thread strength retention rate, wear-resistant, not easy Slide buckle, easy to unscrew.