S-91247A219 3/8"-24 x 1 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 withstands high-stress applications, reducing the risk of fastener failure in demanding environments.
• Enhanced Corrosion Resistance – The zinc plating finish provides a protective barrier against rust and corrosion, extending service life in industrial settings.
• Precise Thread Engagement – 3/8"-24 UNF fine threading ensures tighter, more secure fastening with reduced vibration loosening compared to coarse threads.
• High-Grade Material Performance – Made from Grade 5 steel with Rockwell C25 hardness, offering excellent durability and resistance to wear under load.
• Easy Installation and Removal – The external hex drive and hex head design allow for straightforward torque application with standard tools, speeding up assembly.
• Reliable Thread Fit – Class 2A thread fit provides consistent, smooth engagement with nuts and tapped holes, minimizing cross-threading issues.
• Versatile Partial Threading – The partially threaded design allows for unthreaded shank sections, ideal for applications requiring clamping force without full-length threading.

Professional Applications & Engineering Value

This Grade 5 hex head screw is engineered to address common industrial fastening challenges, such as vibration-induced loosening and corrosion in harsh environments. The 3/8"-24 UNF fine thread configuration delivers superior clamping force and resistance to dynamic loads, making it suitable for machinery, automotive assemblies, and structural frameworks where precision and reliability are critical. Constructed from high-strength steel and finished with zinc plating, it combats moisture and chemical exposure, reducing maintenance needs. The external hex drive ensures compatibility with standard wrenches, facilitating quick installation in tight spaces. By meeting ASME B18.2.1 standards, it guarantees dimensional accuracy and performance consistency, providing engineers with a dependable solution for heavy-duty applications that demand long-term integrity and safety.

Specification Summary & Compliance

This screw adheres to precise dimensional tolerances, including a Class 2A thread fit for consistent assembly and UNF fine threading per industry standards. It is manufactured in compliance with ASME B18.2.1 and SAE J429 specifications, ensuring reliability in mechanical properties. Additionally, it meets regulatory requirements such as RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming its safety for use in various markets without hazardous substances.