S-92620A544 1/4"-20 x 1 1/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capacity with 150,000 PSI tensile strength and Grade 8 classification for critical structural applications
• Superior corrosion resistance through zinc yellow-chromate plating that protects against harsh industrial environments
• Exceptional durability maintained by Rockwell C33 hardness to withstand repeated stress and vibration
• Reliable thread engagement with Class 2A fit UNC coarse threads ensuring consistent fastening performance
• Full-length threading provides maximum grip and adjustment flexibility across the entire 1-1/4" length
• Optimized drive efficiency through external hex head design enabling high-torque installation with standard tools
• Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical performance in demanding industrial applications where failure is not an option. The 150,000 PSI tensile strength and Rockwell C33 hardness provide exceptional resistance to shear and fatigue stresses in heavy machinery, structural steel connections, and automotive assemblies. The zinc yellow-chromate plating creates a robust barrier against corrosion in outdoor or chemically aggressive environments, significantly extending service life. With UNC coarse threads and Class 2A thread fit, these fully threaded fasteners ensure rapid installation and reliable clamping force in both thick materials and vibration-prone applications. The external hex drive design allows for high-torque tightening with common tools, making them ideal for maintenance operations and production line assembly where speed and reliability are paramount.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse thread specifications (1/4"-20). These hex head screws comply with ASME B18.2.1 and SAE J429 Grade 8 requirements, ensuring dimensional consistency and mechanical performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, confirming the absence of restricted substances. The combination of 150,000 PSI tensile strength and Rockwell C33 hardness meets the rigorous demands of industrial fastener applications where reliability and safety are critical.