S-91268A228 1 1/4"-7 x 9" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior wear resistance due to Rockwell C33 hardness, ensuring extended service life in demanding environments
• Optimized thread engagement with UNC coarse threading and Class 2A fit for faster installation and reduced cross-threading risks
• Enhanced torque transmission through the external hex drive and large 1 7/8" head width for secure fastening with standard tools
• Versatile partial threading design with 3" minimum thread length providing flexibility for various material thicknesses
• Full regulatory compliance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards for quality assurance and environmental safety
• Heavy-duty construction using Grade 8 steel for maximum durability in industrial applications

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical performance advantages for heavy-duty industrial applications where failure is not an option. The combination of 150,000 psi tensile strength and Rockwell C33 hardness ensures exceptional resistance to vibration, shock loads, and environmental stressors. The 1 1/4"-7 UNC coarse thread configuration provides superior grip in various materials while the partial threading design offers flexibility for different joint requirements. The external hex drive and substantial head dimensions allow for high torque application without stripping, making these screws ideal for structural steel connections, heavy machinery assembly, and construction applications requiring ASME B18.2.1 compliance and reliable long-term performance.

Specification Summary & Compliance

Manufactured to precise inch system dimensions with Class 2A thread fit tolerance ensuring consistent performance and interchangeability. The UNC coarse thread (1 1/4"-7) with right-hand direction follows industry standards for compatibility. These hex head screws fully comply with ASME B18.2.1 and SAE J429 Grade 8 specifications, and meet environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring they are free from restricted substances for global industrial use.