S-91310A889 M20 x 70 mm ISO 4014, DIN 931 High-Strength Metric Class 10.9 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 150,000 psi ensures reliable performance under extreme loads, preventing fastener failure in critical applications
• Class 10.9 strength rating provides superior mechanical properties for heavy-duty industrial applications requiring maximum reliability
• Rockwell C32 hardness offers excellent wear resistance and durability, extending service life in demanding environments
• M20 coarse thread with 2.5mm pitch enables faster installation and superior vibration resistance compared to fine thread alternatives
• Partial threading design with 46mm minimum thread length provides optimal grip strength while reducing weight and material usage
• External hex drive with 30mm head width allows for high-torque installation using standard tools, ensuring secure fastening in confined spaces
• Full compliance with international standards including ISO 4014 and DIN 931 guarantees interchangeability and quality consistency across global projects

Professional Applications & Engineering Value

This M20 hex head screw delivers exceptional engineering value through its Class 10.9 steel construction and metric coarse threading, specifically designed to address common industrial fastening challenges. The combination of 150,000 psi tensile strength and Rockwell C32 hardness provides critical resistance against shear forces and material fatigue in heavy machinery, structural steel connections, and automotive assemblies. The partial threading configuration optimizes clamping force distribution while the external hex drive ensures reliable torque transmission during installation. Meeting ISO 4014/DIN 931 specifications, these industrial fasteners offer predictable performance in applications where vibration resistance, load distribution, and long-term reliability are paramount considerations for engineering teams.

Specification Summary & Compliance

This high-performance hex head screw features precise M20 x 2.5mm coarse thread with Class 6g thread fit tolerance ensuring consistent engagement and proper clearance. Manufactured to ISO 4014 and DIN 931 standards for dimensional accuracy and mechanical properties. The fastener is fully compliant with RoHS 3 (2015/863/EU) regulations and REACH (EC 1907/2006) requirements, confirming environmental responsibility and chemical safety for global industrial applications.