S-94239A107 5/16"-18 x 1" 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 construction, extending service life in harsh industrial environments.
• Enhanced vibration resistance and secure locking due to the serrated locking feature, preventing loosening in dynamic applications.
• Easy installation and high torque capability with the external hex drive and hex head design, allowing for efficient assembly with standard tools.
• Reliable thread engagement and interchangeability from the UNC coarse thread with Class 2A fit, ensuring consistent performance and compatibility.
• Increased bearing surface and stability from the integrated flange, distributing load effectively and reducing surface damage.
• Full compliance with major industry standards including IFI 111 and SAE J429, guaranteeing quality and safety for professional use.

Professional Applications & Engineering Value

This Grade 8 zinc-plated steel hex head screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, construction equipment, and automotive frameworks. The zinc-plated steel material offers excellent corrosion resistance, crucial for outdoor or chemically exposed environments, while the Rockwell C33 hardness ensures durability against wear and abrasion. Featuring a fully threaded UNC coarse thread and external hex drive, it allows for rapid installation and high clamping force, minimizing assembly time. The serrated locking design effectively counters vibration-induced loosening, a common failure point in dynamic systems. Combined with the flanged head, it provides a wider load distribution, protecting softer materials and enhancing joint integrity. Ideal for applications demanding high tensile strength and long-term reliability, this screw delivers consistent performance in structural and mechanical fastening.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including UNC coarse threads with a Class 2A thread fit for consistent engagement and interchangeability. It meets rigorous manufacturing specifications such as IFI 111 and SAE J429 for Grade 8 fasteners, ensuring mechanical properties like tensile strength and hardness. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms environmental safety, free from hazardous substances, making it suitable for global industrial markets.