4334171 Original Excavator Parts Hexagon Bolt for EX3600-6 

Hitachi original excavator parts hexagonal bolts (universal part number: 4334171) are pure standard fasteners provided by Hitachi Construction Machinery. As an original spare part, it is designed specifically for various series of hydraulic excavators under the Hitachi brand, ensuring a perfect match with the structural connection points of the equipment. This bolt is widely compatible with multiple mainstream excavator models from Hitachi, including mini excavators (such as ZX55US, ZX85USB), medium excavators (such as ZX200, ZX250, ZX350), and large mining excavators (such as EX1200, EX2600). It is mainly used for connecting key parts such as structural components, coverings, and accessories.
 

This hexagonal bolt is the core fastener for excavator structural connections, and its core function is to provide reliable mechanical connections, withstand shear forces, tensile forces, and vibration loads. As an original component, it is precision forged from high-strength alloy steel (such as 35CrMo, 40Cr) and undergoes quenching and tempering heat treatment to achieve strength levels of 8.8, 10.9 or higher, with excellent tensile strength and yield strength. The bolt head is a standard hexagonal shape, making it easy to tighten with a standard wrench; The screw thread is full thread or half thread, and the accuracy meets ISO or GB/T standards. The surface is usually treated with rust prevention, such as galvanizing, Dacromet or phosphating, which has good corrosion resistance.
 

To ensure the long-term effective tightening effect of the bolt, it is necessary to follow the standardized installation and regular inspection process. Calibration torque wrenches must be used during installation, strictly following the torque values specified in the original factory maintenance manual step by step and cross tightening to avoid over tightening causing bolt elongation or breakage, or over loosening causing loose connections. It is recommended to conduct a routine inspection every 250 hours of work or once a week, with a focus on checking whether there are signs of loosening in the bolts of key connection parts (such as the boom, arm, rotary platform, and walking frame). Marking method or torque wrench can be used for re inspection during inspection. Keep the bolts and connecting surfaces clean to prevent rusting.