S-91290A213 M8 x 55 mm DIN 912, ISO 4762 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional durability and wear resistance thanks to the Rockwell C37 hardness rating, ensuring long service life in demanding applications.
• Superior corrosion protection provided by the black-oxide finish on alloy steel, reducing maintenance needs and extending component life.
• High-reliability fastening with a tensile strength of 170,000 PSI, making it suitable for high-stress and critical assemblies.
• Precise and secure thread engagement achieved with the Class 5g6g thread fit, minimizing the risk of loosening under vibration.
• Easy installation and removal using a standard 6mm hex key, facilitating efficient assembly and maintenance workflows.
• Broad industrial compatibility as it conforms to DIN 912 and ISO 4762 standards, ensuring interchangeability and quality.
• Compliance with environmental regulations including RoHS 3 and REACH, making it a responsible choice for global supply chains.

Professional Applications & Engineering Value

This M8 socket head cap screw is engineered to address common industrial challenges such as joint failure under high dynamic loads and corrosion in harsh environments. The black-oxide alloy steel construction offers enhanced resistance to rust and oxidation, which is critical for machinery operating in humid or chemically aggressive settings. With a coarse thread (1.25mm pitch) and Class 5g6g thread fit, it ensures quick assembly and reliable holding power, reducing the risk of strip-out in soft materials or misalignment in precision equipment. Its fully threaded design and high tensile strength make it ideal for heavy-duty applications in automotive, aerospace, and industrial machinery, where vibration resistance and structural integrity are paramount. The hex drive allows for high torque application, ensuring a secure fit in confined spaces.

Specification Summary & Compliance

This screw features a metric M8 x 1.25mm thread with Class 5g6g tolerance for precise fit, a length of 55mm, and a socket head design per DIN 912 / ISO 4762 standards. It is manufactured from alloy steel with a black-oxide surface treatment and meets Strength Class 12.9 requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated industries.