S-92620A753 1/2"-20 x 4 1/2" 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 for critical structural applications
• Superior corrosion protection through zinc yellow-chromate plating in harsh industrial environments
• Precision thread engagement with Class 2A fit ensuring reliable assembly and vibration resistance
• Enhanced driving torque capability thanks to the external hex head design and Rockwell C33 hardness
• Optimized for fine-thread applications with UNF 1/2"-20 threading providing superior clamping force
• Full-length threading enables consistent performance across the entire 4 1/2" length
• Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for quality assurance

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers exceptional engineering value in demanding industrial applications where failure is not an option. The combination of 150,000 psi tensile strength and Rockwell C33 hardness ensures reliable performance in heavy machinery, structural steel connections, and high-vibration equipment. The zinc yellow-chromate plating provides critical corrosion resistance in outdoor or chemically aggressive environments, while the 1/2"-20 UNF fine threading offers superior resistance to loosening under dynamic loads. Engineered with Class 2A thread fit precision, this fully threaded fastener maintains consistent clamping force across its entire 4 1/2" length, making it ideal for thick-section assemblies in construction, manufacturing, and transportation equipment where high-strength bolting solutions are essential for operational safety and longevity.

Specification Summary & Compliance

This heavy-duty fastener features precision Class 2A thread fit with 1/2"-20 UNF fine threading and right-hand thread direction. Manufactured from high-strength steel with zinc yellow-chromate plating finish, the screw complies with ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and performance reliability. The fastener meets industry standards for mechanical properties including 150,000 psi tensile strength and Rockwell C33 hardness, making it suitable for critical applications requiring certified high-strength fasteners with verified material properties and manufacturing consistency.