S-98093A538 M8 x 20 mm ASME B18.2.3.9M, SAE J1199 High-Strength Metric Class 10.9 Steel Flanged Hex Head Screws
High-Strength Metric Class 10.9 Steel Flanged Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with black-phosphate steel coating for extended service life in demanding environments
- Exceptional load-bearing capacity with Class 10.9 strength grade and 150,000 psi tensile strength for critical applications
- Enhanced stability and distribution thanks to the 18mm flange diameter that eliminates the need for separate washers
- Reliable and quick installation with external hex drive and coarse 1.25mm pitch threads for efficient assembly
- Consistent performance ensured by full threading and Class 6g thread fit for precise engagement
- Robust durability with Rockwell C32 hardness that maintains integrity under high stress and vibration
- Broad compatibility with standard metric coarse threading (M8 x 1.25mm) for versatile industrial use
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this M8 hex head screw addresses common challenges in machinery, automotive, and construction sectors where vibration loosening and corrosion are prevalent. The black-phosphate steel material provides a protective layer against rust and wear, significantly extending fastener life in harsh conditions. With its flanged design, it offers superior clamping force and distributes load evenly, reducing the risk of surface damage and simplifying assembly by eliminating additional components. The Class 10.9 strength grade and coarse thread pitch ensure reliable performance under high tensile and shear stresses, making it ideal for structural connections, equipment frames, and other critical fastening solutions that demand durability and safety.
Specification Summary & Compliance
This metric hex head screw features precise dimensions: M8 thread size with 1.25mm coarse pitch, 20mm length, and Class 6g thread fit for accurate mating. It meets ASME B18.2.3.9M specifications for dimensional consistency and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for various industrial and international markets.
