S-91247A496 3/4"-16 x 9" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength, ideal for high-stress industrial assemblies
• Superior corrosion resistance through zinc plating, extending service life in demanding environments
• Precise thread engagement with Class 2A UNF fine threads ensuring reliable, vibration-resistant connections
• Optimized torque transmission via external hex drive and 1 1/8" head width for secure installation
• Controlled thread distribution with 2" minimum thread length in partially threaded design preventing joint loosening
• Consistent mechanical performance guaranteed by Grade 5 certification and Rockwell C25 hardness
• Global compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical reliability for heavy machinery, structural steel connections, and industrial equipment where vibration resistance and tensile strength are paramount. The 3/4"-16 UNF fine threading maintains clamping force under dynamic loads, while the partially threaded shank concentrates stress away from shear planes. Zinc plated steel construction combats corrosion in manufacturing environments, and the external hex drive accommodates high-torque installation. Engineered to ASME B18.2.1 specifications, these industrial fasteners provide predictable performance in automotive, construction, and OEM applications requiring inch system components.

Specification Summary & Compliance

Manufactured to Class 2A thread fit tolerances with UNF fine threads (16 TPI) on a 0.75" diameter. Complies with ASME B18.2.1 dimensional standards and SAE J429 Grade 5 mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Threading is partially threaded with minimum 2" thread length on 9" overall fasteners.