S-91236A683 7/16"-14 x 3 1/2" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• High tensile strength of 60,000 PSI ensures reliable performance in demanding industrial applications, reducing the risk of fastener failure.
• Zinc plating provides excellent corrosion resistance, extending the service life of assemblies in harsh environments.
• External hex drive and hex head design allow for easy installation and high torque application with standard tools, speeding up assembly processes.
• Partially threaded shank offers superior grip and clamping force, minimizing loosening under vibration and dynamic loads.
• Coarse UNC threads with Class 2A fit ensure quick assembly and reliable engagement, even in materials with varying hardness.
• Rockwell B69 hardness provides excellent durability and wear resistance, maintaining thread integrity over repeated use.
• Compliance with ASME B18.2.1, RoHS 3, and REACH guarantees consistent quality, safety, and environmental responsibility for global supply chains.

Professional Applications & Engineering Value

This 7/16"-14 UNC hex head screw is engineered to address critical challenges in heavy-duty assembly, construction, and machinery applications. The steel material combined with zinc plating offers robust protection against rust and corrosion, making it ideal for outdoor or high-moisture environments. The partial threading design ensures maximum clamping force by allowing the unthreaded portion to act as a shear plane, reducing stress concentration and preventing joint failure under vibration. With a coarse thread profile, it facilitates faster installation in steel, wood, and composite materials, while the external hex drive enables high-torque tightening without stripping. These features make it a reliable choice for structural frameworks, industrial equipment, and automotive assemblies where tensile strength and long-term reliability are paramount.

Specification Summary & Compliance

This fastener adheres to Class 2A thread fit tolerances for consistent engagement and meets ASME B18.2.1 specifications for dimensional accuracy. It is manufactured in accordance with ASTM A307 standards and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for international markets.