S-94239A111 5/16"-18 x 2" SAE J429 High-Strength Grade 8 Steel Serrated-Flange Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for demanding applications with Grade 8 classification and 150,000 psi tensile strength, ensuring reliable performance under high stress.
• Superior corrosion resistance provided by the zinc-plated steel finish, extending the fastener's service life in harsh industrial environments.
• Secure, vibration-resistant locking achieved through the serrated flange, which prevents loosening in dynamic or high-vibration machinery.
• Easy installation and high torque capability with the external hex drive and hex head design, allowing for efficient assembly with common tools.
• Wide compatibility and reliable engagement due to the UNC coarse thread and Class 2A thread fit, ensuring consistent performance in various materials.
• Full-threaded design for maximum grip along the entire 2" length, providing enhanced holding power in thick assemblies.
• Compliance with major industry standards including IFI 111 and SAE J429, guaranteeing quality and interoperability for professional use.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 zinc-plated steel hex head screw addresses critical challenges in machinery, construction, and automotive assemblies. The serrated flange provides a secure, vibration-resistant lock that mitigates loosening in high-stress environments, reducing maintenance needs. Its UNC coarse thread and Class 2A thread fit ensure quick, reliable installation in coarse-grained materials, while the external hex drive allows for high-torque application without stripping. The zinc-plated finish offers durable corrosion protection, making it ideal for outdoor or corrosive settings. With a 150,000 psi tensile strength and Rockwell C33 hardness, it delivers consistent performance in structural and load-bearing applications, ensuring long-term reliability and safety.

Specification Summary & Compliance

This fastener features precise Class 2A thread fit and UNC coarse thread specifications for consistent engagement. It complies with IFI 111 and SAE J429 Grade 8 standards, ensuring mechanical properties and dimensional accuracy. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.