S-91247A488 3/4"-16 x 6 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure
• Zinc plating provides superior corrosion resistance, extending service life in harsh industrial environments and reducing maintenance costs
• Grade 5 steel construction with Rockwell C25 hardness delivers optimal balance of strength and durability for repeated use
• Class 2A thread fit with UNF fine threading offers precise engagement and vibration resistance in critical assemblies
• Partially threaded design allows for secure clamping while minimizing thread damage during installation
• External hex drive with 1 1/8" head width enables high-torque installation with standard tools, improving assembly efficiency
• Compliance with multiple industry standards including ASME B18.2.1 and SAE J429 ensures consistent quality and interchangeability

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers exceptional engineering value for heavy-duty industrial applications where reliability is paramount. The combination of 3/4"-16 UNF fine threading and Class 2A thread fit provides superior vibration resistance in machinery, construction equipment, and structural assemblies. The zinc plated finish protects against corrosion in outdoor or high-moisture environments, while the partially threaded design ensures optimal clamping force distribution. With 120,000 psi tensile strength and Rockwell C25 hardness, this fastener maintains integrity under extreme loads, making it ideal for critical connections in manufacturing, automotive, and infrastructure projects where failure is not an option.

Specification Summary & Compliance

This 6 1/2" hex head screw features precise Class 2A thread fit with 3/4"-16 UNF fine threading and 2" minimum thread length. Manufactured to ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring strict material compliance.