Hex lock nut for American Crane 9310

The 804440 hex lock nut serves as a critical fastening component within the structural assemblies of heavy-duty crawler cranes. Its primary function is to secure threaded joints, maintaining tension and preventing loosening caused by operational vibrations, mechanical impacts, or cyclic load shifts during crane operation. By providing a reliable locking mechanism, this component helps preserve the integrity of bolted connections in high-stress areas of the machine.

This part is compatible with the American Crane 9310 and the Terex-American CC3113 crawler crane models. It is manufactured to meet a 1 ¼”-7UNC thread specification, which defines a nominal diameter of 1.25 inches with 7 threads per inch. This unified coarse thread standard is engineered for heavy-duty applications where secure engagement is required for structural stability.

Lock nuts are used throughout heavy machinery to ensure that fasteners remain tight in environments where standard nuts might back off. They utilize internal mechanisms to resist rotation, ensuring that joints in the boom structure, undercarriage, or counterweight systems remain properly tensioned. Proper installation according to the specified torque settings is necessary to ensure the component functions as intended within the machine assembly.