S-92865A403 9/16"-18 x 1 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: With a tensile strength of 120,000 psi, this screw reliably handles high-stress applications, reducing the risk of fastener failure in demanding environments.
• Superior Corrosion Resistance: The zinc plating provides a durable protective barrier, extending the service life of components in humid or corrosive industrial settings.
• Precise & Secure Fastening: The Class 2A thread fit and fine UNF thread pattern ensure tight, accurate engagement, minimizing loosening from vibration and improving assembly reliability.
• Optimized for High-Torque Applications: The external hex head design allows for high torque application with standard tools, enabling efficient installation and removal in confined spaces.
• Guaranteed Material Integrity: The Grade 5 steel classification and Rockwell C25 hardness provide a proven balance of strength and toughness, resisting wear and deformation under load.
• Full Thread Engagement: Being fully threaded maximizes grip and clamping force along the entire length, providing uniform stress distribution for a more secure hold.
• Broad Industry Compliance: Meets ASME B18.2.1 and SAE J429 specifications, ensuring interchangeability and performance reliability in regulated mechanical systems.

Professional Applications & Engineering Value

This 9/16"-18 UNF hex head screw is engineered to solve critical fastening challenges in heavy machinery, automotive assemblies, and structural frameworks. The Grade 5 steel construction provides the necessary 120,000 psi tensile strength to withstand dynamic loads and vibration, a common failure point in industrial equipment. The fine thread and Class 2A fit are crucial for applications requiring precise preload and resistance to loosening. The zinc plating is a key defense against corrosion, making it suitable for outdoor or non-climate-controlled environments. Its external hex drive and full threading simplify installation in hard-to-reach areas, reducing assembly time and labor costs while ensuring a durable, long-lasting connection.

Specification Summary & Compliance

This fastener adheres to strict dimensional and performance standards. The UNF thread features a Class 2A tolerance for consistent, reliable fit. It is manufactured in compliance with ASME B18.2.1 and SAE J429 for Grade 5 fasteners. The product is also confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets global environmental and safety regulations for hazardous substances.