S-91247A324 7/16"-20 x 2 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior Tensile Strength – With 120,000 psi tensile strength, this screw provides reliable holding power for demanding industrial applications, reducing the risk of fastener failure under high stress.
• Enhanced Durability & Corrosion Resistance – The zinc plating offers a protective barrier against rust and environmental factors, extending the service life of your assemblies in harsh conditions.
• Precision Thread Fit – Class 2A thread fit ensures smooth engagement and consistent clamping force, minimizing cross-threading and improving installation efficiency.
• High-Strength Material – Made from Grade 5 steel with Rockwell C25 hardness, it withstands heavy loads and repetitive stress without deforming, ideal for structural and machinery uses.
• Optimized Thread Design – 7/16"-20 UNF fine threads deliver better vibration resistance and finer adjustment control compared to coarse threads, enhancing joint integrity.
• Secure External Hex Drive – The external hex head allows for high-torque application with standard tools, ensuring tight fastening and easy maintenance in confined spaces.
• Partial Threading for Versatility – Partially threaded design provides an unthreaded shank section, offering improved shear strength and alignment in bolted connections.

Professional Applications & Engineering Value

This Grade 5 steel hex head screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, construction, and automotive frameworks. The combination of UNF fine threads and Class 2A thread fit ensures precise, vibration-resistant fastening, reducing loosening in dynamic environments. The zinc plating adds a corrosion-resistant layer, crucial for outdoor or humid applications, while the partial threading enhances load distribution, preventing stress concentration. By meeting ASME B18.2.1 and SAE J429 standards, it guarantees consistency and reliability, making it a trusted choice for engineers seeking durability and compliance in inch system fasteners.

Specification Summary & Compliance

This fastener adheres to precise dimensional tolerances, including Class 2A thread fit for consistent engagement and UNF fine thread specifications. It conforms to ASME B18.2.1 and SAE J429 manufacturing standards, ensuring interoperability and quality. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.