S-91268A794 9/16"-12 x 3 1/2" 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 hardness and durability with Rockwell C33 rating to resist wear and deformation under heavy loads
• Optimized torque transmission through external hex drive design for secure installation and removal
• Enhanced vibration resistance with coarse UNC threads that maintain grip in dynamic environments
• Reduced material stress concentration through partial threading design while maintaining full strength requirements
• Industry-standard compatibility with Class 2A thread fit ensuring precise mating with corresponding components
• Environmental compliance assurance meeting RoHS 3 and REACH regulations for safe industrial use

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical performance where structural integrity cannot be compromised. The 9/16"-12 UNC coarse thread configuration provides superior resistance to vibrational loosening in heavy machinery, construction equipment, and industrial assembly applications. Manufactured from high-grade steel with Rockwell C33 hardness, these fasteners withstand extreme mechanical stresses while maintaining dimensional stability. The partial threading design strategically concentrates thread engagement where needed most, reducing weight without sacrificing the 150,000 psi tensile strength required for critical connections. Engineered to ASME B18.2.1 specifications, these screws ensure reliable performance in demanding environments where fastener failure is not an option.

Specification Summary & Compliance

This 3 1/2" length hex head screw features precise Class 2A thread fit with 9/16"-12 UNC coarse threads and partial threading extending to a minimum of 1 3/8". Manufactured in compliance with ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. The fastener meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards for industrial applications.