Buy HITACHI EX120-5 CYLINDER HEAD BOLT LONG M8 X 8.6 CM | Tonkee®

The cylinder head bolt for the Hitachi EX120-5 is typically made from high-quality steel.

This steel is chosen for its excellent strength and durability properties, which are vital to withstand the high levels of stress and torque that this component experiences during engine operation. The specific grade of steel used may vary, but it is usually a heat-treated alloy steel to enhance its mechanical properties, including tensile strength and resistance to deformation.

Dimensions:
The cylinder head bolt has a diameter of M8, which corresponds to a thread size of 8 millimeters. The length of the bolt is 8.6 centimeters (86 millimeters). These dimensions are critical as they determine how securely the cylinder head is attached to the engine block. The M8 thread size ensures a proper fit into the corresponding threaded holes in the cylinder head and engine block, while the 8.6 cm length ensures that the bolt can securely fasten these components together.

Thread Type:
The thread type used for the cylinder head bolt is typically a metric fine thread. This means that the threads are closely spaced, providing a secure and tight fit when the bolt is threaded into place. The fine thread pitch enhances the bolt's ability to resist vibration and loosening over time, which is essential in an environment where heavy machinery like the Hitachi EX120-5 is subjected to constant movement and jarring.

Torque Specifications:
Proper torque specifications are crucial when installing the cylinder head bolt.

Applying the correct amount of torque ensures that the bolt is tightened to the manufacturer's recommended specifications, preventing under-tightening or over-tightening, both of which can lead to issues such as leaks or component damage. Exact torque values can vary depending on the specific engine model and bolt design, so it is essential to refer to the manufacturer's guidelines or service manual for precise torque specifications.

Importance of Cylinder Head Bolt:
The cylinder head bolt is a vital component in the engine assembly of the Hitachi EX120-5 excavator. It is responsible for securing the cylinder head to the engine block, creating a tight seal between the two components. This seal is critical because it prevents the escape of combustion gases from the engine's cylinders and ensures that the engine operates efficiently.

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