S-98093A564 M8 x 50 mm ASME B18.2.3.9M, SAE J1199 High-Strength Metric Class 10.9 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with Class 10.9 strength grade and 150,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through black-phosphate steel coating that protects against rust and extends service life in harsh environments
• Enhanced load distribution thanks to the integrated flange design that reduces surface pressure and prevents loosening under vibration
• Secure fastening with precise fit achieved through Class 6g thread tolerance and M8x1.25 coarse thread pattern for easy installation and stable connections
• Optimized installation efficiency with external hex drive and standard 13mm head width for common tool compatibility and quick assembly
• Versatile partial threading allowing unthreaded shank sections for precise clamping and shear resistance in structural applications
• Reduced maintenance requirements due to the combination of high-strength steel construction and protective phosphate coating

Professional Applications & Engineering Value

This M8 hex head screw delivers critical engineering solutions for industrial applications where vibration resistance and structural integrity are paramount. The black-phosphate steel construction provides exceptional corrosion protection in challenging environments, while the flanged design eliminates the need for separate washers and distributes clamping force over a wider area. The Class 10.9 strength rating ensures reliable performance in heavy machinery, automotive assemblies, and construction equipment where high tensile loads are common. The metric coarse thread with 1.25mm pitch facilitates quick installation and maintains secure fastening even under dynamic loading conditions. With partial threading and right-hand orientation, this fastener is ideal for applications requiring precise unthreaded shank sections for improved shear strength and alignment.

Specification Summary & Compliance

This M8 x 1.25 x 50mm hex head screw features precise Class 6g thread fit tolerance and coarse thread spacing according to metric standards. The fastener meets ASME B18.2.3.9M dimensional specifications and SAE J1199 requirements for consistent quality and interchangeability. Manufacturing compliance includes RoHS 3 (2015/863/EU) for hazardous substance restriction and REACH (EC 1907/2006) for chemical safety, ensuring environmental responsibility and workplace safety standards are maintained.