S-94239A118 3/8"-16 x 2" SAE J429 High-Strength Grade 8 Steel Serrated-Flange Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: Grade 8 classification and 150,000 psi tensile strength ensure reliable performance in high-stress applications, preventing fastener failure.
• Superior Corrosion Resistance: Zinc-plated steel construction provides a durable protective barrier, extending service life in demanding industrial environments.
• Enhanced Stability and Vibration Resistance: The serrated locking flange design minimizes loosening under dynamic loads, maintaining joint integrity.
• Optimized for Efficient Installation: External hex drive and coarse UNC threads allow for quick assembly and high clamping force with standard tools.
• Precision Thread Fit: Class 2A thread ensures consistent, reliable engagement with nuts and tapped holes, reducing the risk of cross-threading.
• Excellent Surface Durability: Rockwell C33 hardness provides high resistance to wear and deformation, ensuring the fastener can be reused if necessary.
• Broad Industrial Compliance: Meets IFI 111 and SAE J429 standards, guaranteeing material quality and dimensional consistency for professional use.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to solve critical fastening challenges in heavy machinery, construction, and automotive assemblies. The zinc-plated steel material offers a robust defense against rust and corrosion, which is vital for equipment operating in harsh conditions. The flanged design with serrations distributes clamp load over a wider area and provides a locking feature that counters vibration-induced loosening—a common failure point in dynamic systems. The coarse UNC thread and fully threaded body enable rapid installation and deep engagement in a variety of materials, from steel frames to heavy-duty castings. Its 150,000 psi tensile strength and high hardness make it a go-to choice for structural connections where safety and longevity are non-negotiable.

Specification Summary & Compliance

This fastener features a 3/8"-16 UNC thread with a Class 2A fit for consistent, precision engagement. It is manufactured to meet IFI 111 and SAE J429 specifications, ensuring dimensional accuracy and mechanical properties. The product is also verified to be compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming it is free from hazardous substances for safe use in global markets.