S-90002A132 5/8"-11 x 2 1/2" ASME B18.2.1, SAE J429 High-Strength Steel Hex Head Screws with Material Certification

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance through zinc yellow-chromate plating, extending service life in harsh industrial environments
• Optimized torque transmission with external hex drive design and 15/16" head width for secure installation
• Enhanced thread engagement with UNC coarse threading and Class 2A fit for quick assembly and vibration resistance
• Proven durability with Rockwell C33 hardness maintaining structural integrity under repeated stress
• Versatile partial threading allowing for both clamping and alignment functions in complex assemblies
• Industry-standard compliance ensuring interchangeability and reliability across industrial applications

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical performance where failure is not an option. The zinc yellow-chromate plating provides exceptional corrosion protection, making them ideal for outdoor equipment, construction machinery, and manufacturing facilities exposed to moisture and chemicals. The 5/8"-11 UNC coarse thread design ensures rapid installation and superior resistance to vibration loosening in heavy equipment, structural steel connections, and automotive assemblies. With 150,000 psi tensile strength and controlled partial threading, these fasteners prevent joint failure while allowing precise adjustment in critical bolted connections. The external hex drive and substantial head dimensions enable high torque application without stripping, solving common installation challenges in maintenance and production environments.

Specification Summary & Compliance

Manufactured to exacting ASME B18.2.1 and SAE J429 specifications, these hex head screws feature precision Class 2A thread fit for consistent engagement and reliable performance. The UNC coarse thread with 5/8"-11 sizing and 2 1/2" length provides standardized dimensions for industrial applications. The Grade 8 classification guarantees mechanical properties including Rockwell C33 hardness and 150,000 psi minimum tensile strength. The zinc yellow-chromate plating meets industry standards for corrosion protection while maintaining dimensional accuracy. All components comply with relevant industrial specifications for material composition and manufacturing tolerances.