S-91268A739 9/16"-12 x 2 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 - Grade 8 classification and 150,000 psi tensile strength ensure reliable performance in high-stress industrial applications
• Superior Thread Engagement - UNC coarse thread pattern with Class 2A fit provides secure fastening and vibration resistance in demanding environments
• Optimized Mechanical Properties - Rockwell C33 hardness delivers excellent wear resistance while maintaining necessary ductility
• Enhanced Installation Efficiency - External hex drive and 13/16" head width allow for high torque application with standard tools
• Strategic Thread Design - Partial threading concentrates strength where needed while reducing weight and material usage
• Regulatory Compliance Assurance - Meets ASME B18.2.1 specifications and environmental standards including RoHS 3 and REACH
• Dimensional Precision - 2 1/2" length with 1 3/8" minimum thread length provides consistent performance across applications

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical performance in heavy machinery, structural steel connections, and industrial equipment where failure is not an option. The 9/16"-12 UNC coarse thread configuration ensures rapid installation and superior vibration resistance in high-load applications. Manufactured from high-grade steel with Rockwell C33 hardness, these fasteners maintain integrity under extreme stress while the partial threading design optimizes clamp load distribution. The external hex drive accommodates high torque requirements, making them ideal for construction, manufacturing, and automotive applications demanding 150,000 psi tensile strength and reliable, long-term performance in challenging environments.

Specification Summary & Compliance

This Grade 8 hex head screw features precise Class 2A thread fit with 9/16"-12 UNC coarse thread specifications and 2 1/2" length. Manufactured to ASME B18.2.1 standards and SAE J429 Grade 8 requirements, ensuring dimensional accuracy and mechanical performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, providing assurance for sustainable procurement and industrial use.