手动吊钳是石油钻修井作业中，用于管柱（如钻杆、套管等 ）及工具上卸扣的手动工具。可通过更换扣合钳头、变换扣合台阶，适配不同管径作业需求，按 API Spec 7K 规范设计制造，靠人力操作手柄，利用杠杆原理传递扭矩，实现管柱连接或拆卸 。Manual tongs are manual tools for making - up and breaking - out of pipe strings (such as drill pipes, casings, etc.) and tools in oil drilling and workover operations. They can adapt to different pipe diameters by replacing the latch lug jaws and changing the latch steps. Designed and manufactured in accordance with API Spec 7K, they rely on manual operation of the handle and use the lever principle to transmit torque, achieving the connection or disassembly of pipe strings.