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Class 8.8 hardened Allen bolts are made from medium carbon steel and undergo heat treatment to achieve a tensile strength of 800 MPa and a yield strength of 640 MPa. These bolts are typically manufactured according to DIN 912 or ISO 4762 standards and are available in diameters from 4 to 24 millimeters and lengths from 10 to 200 millimeters. The head is designed with an internal hexagon and a 90-degree angle. Surface finishes may include plain, phosphate-coated, cold-galvanized, or black oxide for improved corrosion resistance. This type of bolt is well-suited for structural and mechanical joints that require medium to high strength.
The thread of a class 8.8 Allen bolt is metric and designed according to ISO standards, with pitch values ranging from 0.7 to 2.5 millimeters. Machining precision is maintained within a ±0.15 millimeter tolerance. After heat treatment, the surface hardness ranges between 22 and 32 HRC. These bolts provide stable performance under moderate torque and high tensile loads. They are widely used in automotive, structural steel, industrial machinery, and heavy equipment applications. Allen bolts of this grade are fastened with a hex key, ensuring a secure and durable connection.
WEBSITE: 8.8 allen cap head screw Iran
