S-90124A581 5/16"-18 x 3/4" ASME B18.2.1, SAE J429 Steel Wire-Lockable Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Exceptional load-bearing capacity with 120,000 psi tensile strength for heavy-duty applications
• Optimized torque transmission through external hex drive design for secure installation
• Reliable thread engagement with UNC coarse thread pattern and Class 2A fit for consistent performance
• Enhanced durability with Rockwell C25 hardness rating to withstand mechanical stress
• Full-threaded design provides maximum grip length and uniform load distribution
• Regulatory compliance ensures material safety and meets international industrial standards

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel hex head screw delivers exceptional engineering value across industrial applications where vibration resistance and structural integrity are paramount. The UNC coarse thread pattern ensures rapid installation and superior holding power in softer materials, while the external hex drive accommodates high-torque applications without stripping. The zinc plating provides essential corrosion protection for machinery, equipment assemblies, and structural frameworks exposed to harsh operating conditions. With fully threaded design and Class 2A thread fit, these screws maintain consistent clamping force in automotive, construction, and manufacturing applications where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse thread specifications. Complies with ASME B18.2.1 and SAE J429 manufacturing standards, ensuring interchangeability and performance reliability. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for hazardous substance restrictions. The 5/16"-18 thread size with 3/4" length provides standardized compatibility across industrial fastener systems.