經由調整氣體壓力來控制扭矩大小，為允許特定的扭矩需求設定，每臺工具都配有專用的氣壓扭矩對照圖表和校正報告。且為能更進一步的應用，氣動扭矩扳手可同時搭配扭矩傳感器，瞬時輸出的扭矩更精確。在獲得所需的扭矩后可使用合適的回路系統以手動或自動來關閉氣源。

By adjusting the gas pressure to control the torque size, each tool is equipped with a dedicated pneumatic torque comparison chart and calibration report to allow specific torque requirements to be set. For further application, pneumatic torque wrenches can be combined with torque sensors to achieve more precise instantaneous torque output. After obtaining the required torque, a suitable circuit system can be used to manually or automatically shut off the air source.

工件與工件的連接有不同的方式，如鉚接、焊接、膠接、螺紋連接等。其中，螺紋連接由于具有零部件標準化、裝配簡單、拆卸方便、效率高且成本低等優點，是機械裝配制造領域基礎、標準化程度高、應用也非常普遍的一種連接方式。

There are different ways to connect workpieces, such as riveting, welding, bonding, and threaded connections. Among them, threaded connection is a basic, highly standardized, and widely used connection method in the field of mechanical assembly and manufacturing due to its advantages of standardized components, simple assembly, convenient disassembly, high efficiency, and low cost.

而絕大多數螺紋連接在裝配時都必須擰緊，這也使得擰緊裝配技術成為工業裝配與連接技術的重要技術之一。

The vast majority of threaded connections must be tightened during assembly, making tightening assembly technology one of the important technologies in industrial assembly and connection technology.

螺紋連接包括螺栓連接、雙頭螺柱連接，螺釘連接和緊定螺釘連接四種基本類型。螺紋連接的目的是通過擰緊螺栓/螺母，將被連接件可靠地連接在一起。

Screw connections include four basic types: bolt connections, double headed screw connections, screw connections, and set screw connections. The purpose of threaded connections is to reliably connect the connected parts together by tightening the bolts/nuts.

裝配擰緊的實質是控制擰緊過程中的軸向預緊力，增強連接的剛性和緊密性，以防松和防滑。預緊力，即螺紋連接在承受工作載荷之前預先施加的作用力，是螺紋連接的重要參數，直接影響著螺紋連接的質量。

The essence of assembly tightening is to control the axial pre tightening force during the tightening process, enhance the rigidity and tightness of the connection, and prevent loosening and slipping. Pre tightening force, which refers to the pre applied force on threaded connections before bearing working loads, is an important parameter of threaded connections and directly affects the quality of threaded connections.

過大或過小的預緊力都是有害的：預緊力過大會造成螺栓被擰斷，被連接件被壓碎、扭曲或斷裂等嚴重后果；預緊力不足則會導致被連接件錯位、歪斜，螺母松脫，甚緊固件被剪斷。因此，擰緊過程中，對預緊力大小、準確度的把握十分重要。所以，定扭矩的擰緊工具應運而生。

Excessive or insufficient pre tightening force is harmful: excessive pre tightening force can cause serious consequences such as bolt breakage, crushing, twisting, or fracture of the connected parts; Insufficient pre tightening force can cause the connected parts to be misaligned, skewed, nuts to loosen, and even fasteners to be cut off. Therefore, it is crucial to grasp the magnitude and accuracy of the pre tightening force during the tightening process. So, tightening tools with fixed torque have emerged.

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