S-92620A721 1/2"-13 x 2 1/4" 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 a tensile strength of 150,000 psi, this screw reliably handles extreme mechanical stresses in demanding applications.
• Superior Corrosion Resistance: The zinc yellow-chromate plating provides a durable barrier, significantly extending service life in harsh or outdoor environments.
• High-Strength Material Grade: Manufactured from Grade 8 steel with a Rockwell C33 hardness, ensuring high resistance to wear, stripping, and shear forces.
• Optimized for Efficient Installation: The external hex drive and coarse UNC threads enable quick, secure fastening with standard tools, reducing assembly time.
• Precision Thread Fit: Class 2A thread tolerance ensures consistent, reliable engagement with nuts and tapped holes, minimizing the risk of cross-threading.
• Full Threading for Maximum Grip: The completely threaded shank allows for adjustable clamp load and secure fastening along the entire length.
• Proven Compliance for Industrial Use: Meets ASME B18.2.1 and SAE J429 specifications, guaranteeing dimensional accuracy and performance for professional applications.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to solve critical challenges in heavy machinery, structural steel connections, and high-vibration equipment. Its 150,000 psi tensile strength and Rockwell C33 hardness prevent failure under dynamic loads and shock, while the zinc yellow-chromate plating combats rust in industrial or marine settings. The 1/2"-13 UNC coarse thread and external hex drive facilitate rapid installation and disassembly, even in tight spaces, reducing maintenance downtime. Fully compliant with ASME B18.2.1, it delivers reliable performance in construction, automotive, and manufacturing applications where safety and durability are non-negotiable.

Specification Summary & Compliance

This fastener features a 1/2"-13 UNC coarse thread with a Class 2A thread fit for consistent engagement. It is fully threaded and meets dimensional and mechanical specifications per ASME B18.2.1 and SAE J429. The zinc yellow-chromate finish provides corrosion protection, and the material complies with industry standards for high-strength steel fasteners.