S-91310A556 M8 x 75 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 in high-stress applications, reducing the risk of fastener failure
• Class 10.9 strength grade provides superior load-bearing capacity for demanding industrial and construction projects
• Rockwell C32 hardness offers excellent resistance to wear and deformation, extending service life in harsh environments
• Partially threaded design allows for precise clamping force control and secure fastening in assemblies requiring unthreaded shank sections
• Metric coarse threading (M8 x 1.25mm) enables quick installation and superior resistance to vibration loosening compared to fine threads
• External hex drive configuration provides secure tool engagement for efficient installation and removal with standard wrenching tools
• Class 6g thread fit ensures consistent, reliable engagement with mating components while maintaining installation ease

Professional Applications & Engineering Value

This high-strength Class 10.9 steel hex head screw delivers exceptional engineering value across demanding industrial applications where reliability is paramount. The M8 coarse thread configuration with 1.25mm pitch provides superior vibration resistance in machinery, automotive assemblies, and structural frameworks. The partially threaded design allows the unthreaded shank section to bear shear loads directly, preventing thread damage while maintaining clamping force integrity. With 150,000 psi tensile strength and Rockwell C32 hardness, this fastener withstands extreme mechanical stresses in heavy equipment, construction projects, and manufacturing systems. The external hex drive ensures compatibility with standard tools for efficient maintenance and assembly operations, making it ideal for production lines and field service applications requiring dependable, high-performance fastening solutions.

Specification Summary & Compliance

This M8 x 1.25 x 75mm hex head screw features Class 6g thread tolerance for precise fitment and maintains dimensional accuracy per ISO 4014 specifications (equivalent to DIN 931). The fastener is manufactured to meet Class 10.9 strength requirements with minimum thread length of 22mm and overall length of 75mm. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and material restrictions adherence for global industrial applications.