S-91290A146 M20 x 320 mm DIN 912 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under extreme loads, minimizing the risk of fastener failure in critical applications.
• Superior wear and corrosion resistance from the black-oxide finish on alloy steel, extending service life in demanding industrial environments.
• High-strength Class 12.9 rating and Rockwell C37 hardness provide outstanding durability and resistance to stripping or shearing.
• Precise Class 5g6g thread fit with coarse M20x2.5 threads allows for faster assembly and secure fastening in a wide range of materials.
• Standard hex socket drive (17mm) offers easy installation and high torque transmission with common tools, reducing assembly time.
• Partially threaded 320mm design provides an unthreaded shoulder for precise component alignment and increased shear strength.
• Full compliance with DIN 912, RoHS 3, and REACH ensures consistent quality, safety, and environmental responsibility for global supply chains.

Professional Applications & Engineering Value

This M20x2.5 Class 12.9 Metric Socket Head Cap Screw is engineered to solve critical challenges in heavy machinery, automotive assembly, and structural frameworks where high tensile strength and vibration resistance are paramount. The black-oxide alloy steel construction combats corrosion, while the coarse thread design and Class 5g6g thread fit ensure rapid, reliable engagement in both metallic and composite materials. Its partially threaded rod configuration with a 320mm length provides an unthreaded section that acts as a precision dowel, resisting shear forces and maintaining alignment in dynamic loads. Ideal for industrial socket screw applications requiring DIN 912 compliance, this fastener delivers consistent performance where failure is not an option.

Specification Summary & Compliance

This socket head cap screw features an M20x2.5 coarse thread with a Class 5g6g thread fit per ISO metric standards, ensuring precise dimensional accuracy. The partially threaded design has a minimum thread length of 52mm on a 320mm shaft. It is manufactured to meet DIN 912 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing it is free from hazardous substances for safe use in regulated industries.