S-91247A636 3/8"-16 x 3" 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 Grade 5 steel construction and 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
• Optimized thread engagement with Class 2A thread fit and UNC coarse threads ensuring secure, vibration-resistant connections
• Efficient installation and removal via external hex drive design compatible with standard wrenching tools
• Controlled fastening precision with partially threaded shank design preventing over-tightening in critical assemblies
• Consistent mechanical properties backed by Rockwell C25 hardness for maintained performance under repeated stress
• Regulatory compliance assurance meeting ASME B18.2.1, SAE J429 standards and environmental directives

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 5 hex head screws address critical fastening challenges where vibration resistance and structural integrity are paramount. The zinc-plated steel construction provides essential corrosion protection for machinery, structural frames, and equipment exposed to operational stresses. The 3/8"-16 UNC coarse thread configuration delivers superior grip in both metallic and composite materials, while the partially threaded design concentrates clamping force precisely where needed. This combination makes these external hex drive fasteners ideal for automotive assemblies, construction equipment, and manufacturing machinery where 120,000 psi tensile strength ensures long-term reliability under dynamic loading conditions.

Specification Summary & Compliance

This 3/8"-16 UNC hex head screw features Class 2A thread fit tolerances and coarse thread spacing manufactured to ASME B18.2.1 and SAE J429 specifications. The fastener demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. With 1" minimum thread length on a 3" overall length, the screw maintains dimensional consistency for repeatable assembly performance.