S-91247A654 3/8"-16 x 9" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Enhanced load-bearing capacity with 120,000 PSI tensile strength and Grade 5 classification for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating that protects against rust and extends service life in harsh environments
• Optimized installation efficiency with UNC coarse threading and external hex drive enabling quick assembly and reduced threading time
• Precise thread engagement with Class 2A thread fit ensuring consistent fastening and vibration resistance in machinery
• Reduced material and weight through partial threading design while maintaining full strength in the engaged section
• High hardness durability with Rockwell C25 rating providing excellent wear resistance and thread integrity
• Standardized compatibility with inch system dimensions (9" length, 3/8"-16 thread) for easy replacement and inventory management

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers exceptional engineering value through its zinc-plated steel construction and UNC coarse threading, specifically designed to address industrial fastening challenges. The partially threaded design concentrates strength where needed most, preventing thread damage in structural applications while reducing overall weight. With 120,000 PSI tensile strength and Rockwell C25 hardness, it withstands heavy vibrational loads and dynamic stresses in machinery assembly, construction frameworks, and transportation equipment. The external hex drive provides superior torque transmission during installation, while the coarse thread pitch ensures rapid assembly in steel-to-steel connections. These features make it ideal for industrial maintenance, heavy equipment manufacturing, and infrastructure projects requiring reliable, high-strength fasteners.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit tolerances with 3/8"-16 UNC coarse threading and partial threading configuration. Manufacturing complies with ASME B18.2.1 and SAE J429 Grade 5 specifications for dimensional accuracy and mechanical properties. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements for environmental safety and restricted substances.