S-91268A957 1 1/2"-6 x 4 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 critical structural applications
• Superior wear resistance due to Rockwell C33 hardness, extending service life in demanding environments
• Reliable fastening performance through Class 2A thread fit ensuring consistent engagement and vibration resistance
• Optimized installation efficiency with UNC coarse threading and external hex drive for rapid assembly
• Full-length thread coverage provides maximum grip range and flexibility in material thickness
• Heavy-duty construction with 2 1/4" hex head offering superior torque transmission
• Regulatory compliance assurance meeting industrial standards and environmental regulations

Professional Applications & Engineering Value

Engineered for heavy machinery, structural steel connections, and industrial equipment assembly, this Grade 8 hex head screw delivers critical reliability where failure is not an option. The steel construction with Rockwell C33 hardness withstands extreme vibrational forces and dynamic loads, while the UNC coarse threading prevents cross-threading during high-speed installation. The external hex drive and substantial 2 1/4" head width provide exceptional torque capability for secure fastening in thick materials. These fully threaded fasteners maintain consistent clamping force across the entire 4 1/2" length, making them ideal for construction, mining, and manufacturing applications requiring 150,000 psi tensile strength performance.

Specification Summary & Compliance

Manufactured to Class 2A thread fit tolerances with 1 1/2"-6 UNC coarse thread specifications. Complies with ASME B18.2.1 and SAE J429 Grade 8 standards for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Right-hand thread direction with inch system measurements throughout.