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The connecting rod bolt is one of the critical components in diesel and gasoline engines, responsible for securely fastening the connecting rod to the crankshaft. These bolts are typically manufactured from high-tensile alloy steel and undergo heat treatments such as nitriding or carburizing. The surface hardness of a connecting rod bolt is generally between 38 and 42 HRC, with a tensile strength exceeding 1000 MPa. Their diameters vary between 10 and 18 millimeters depending on the engine type, while lengths can reach up to 120 millimeters. The precise thread design ensures uniform stress distribution and prevents loosening under dynamic loads.
The tightening torque of a connecting rod bolt is usually set between 80 and 220 Newton-meters, depending on engine specifications and bolt dimensions. These bolts must resist cyclic and vibrational stresses to prevent fatigue or failure. Anti-corrosion coatings such as phosphate or galvanization are applied to extend service life. Under standard operating conditions, a connecting rod bolt can last over 10,000 working hours, playing a crucial role in maintaining reliable engine performance.
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