S-91290A385 M3.5 x 25 mm ASTM A574M, DIN 912, ISO 4762 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for demanding applications with Class 12.9 rating and 170,000 psi tensile strength, ensuring reliable performance under high stress.
• Superior corrosion resistance provided by the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
• Precise and secure installation enabled by the 2.5 mm hex drive and standard socket head profile, minimizing stripping and ensuring consistent torque application.
• High durability and wear resistance due to Rockwell C37 hardness, maintaining fastener integrity through repeated use.
• Broad compatibility and reliable fit with Class 6g thread fit and M3.5x0.6 mm coarse thread, facilitating easy assembly and reducing cross-threading risks.
• Full thread engagement for maximum holding power as a fully threaded screw, providing uniform clamping force along the entire 25 mm length.
• Compliance with international standards including DIN 912, ISO 4762, and ASTM A574M, ensuring quality and interoperability in global projects.

Professional Applications & Engineering Value

This Class 12.9 black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy-duty mechanical assemblies, such as machinery, automotive components, and precision equipment. The M3.5 coarse thread and Class 6g thread fit ensure rapid, secure fastening while minimizing the risk of thread damage, which is vital for high-vibration environments. The black-oxide surface treatment enhances corrosion resistance without sacrificing the 170,000 psi tensile strength, making it ideal for applications exposed to moisture, chemicals, or extreme loads. By combining a 2.5 mm hex drive with a standardized socket head profile, it allows for efficient torque transmission in confined spaces, reducing assembly time and improving overall structural reliability. These features make it a preferred choice for engineers seeking durable, high-performance metric fasteners that meet rigorous industrial demands.

Specification Summary & Compliance

This socket head cap screw features precise Class 6g thread tolerances per ISO metric standards, with a right-hand M3.5x0.6 mm coarse thread and a fully threaded design for consistent performance. It adheres to DIN 912, ISO 4762, and ASTM A574M manufacturing specifications, ensuring dimensional accuracy and mechanical reliability. Additionally, the product is RoHS 3 (2015/863/EU) Compliant, supporting environmental and safety regulations in various industries.