20X60 8.8 allen bolt , Iran

The quenched and tempered steel Allen bolt grade 8.8 size M20 with a length of 60 mm has an approximate weight of 0.31 kg and complies with DIN 912 and ISO 898 standards. Its alloy composition typically includes 0.25–0.55% carbon, 0.5–0.8% manganese, and minor amounts of silicon and phosphorus. This combination enhances mechanical strength and improves heat treatment capability, providing the necessary conditions for high tensile and shear load resistance.

The heat treatment process of the M20x60 Allen bolt involves quenching and tempering, resulting in a surface hardness of 22 to 34 HRC. Quenching forms a martensitic structure, while tempering increases toughness and reduces brittleness. The outcome is a bolt with an optimized balance of hardness and ductility, making it ideal for demanding industrial applications requiring both strength and reliability.

Industrial applications of the 8.8 M20x60 Allen bolt include oil and gas facilities, mining machinery, construction equipment, and heavy steel structures. With a 2.5 mm pitch and an effective thread cross section of 245 mm², it can withstand axial loads exceeding 150 kN. Its high resistance to vibration and cyclic loads, combined with protective coatings such as phosphating or galvanization, extends service life and ensures secure performance in harsh environmental conditions.
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