S-91247A369 1/2"-20 x 5 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior load-bearing capacity with 120,000 psi tensile strength, ideal for high-stress industrial assemblies.
• Enhanced corrosion resistance from zinc plating, extending service life in harsh environments.
• Reliable fine thread engagement with 1/2"-20 UNF and Class 2A fit, ensuring precise, vibration-resistant connections.
• Optimized for heavy-duty use through Grade 5 steel and Rockwell C25 hardness, offering excellent durability.
• Easy installation and removal with external hex drive and 3/4" head width, compatible with standard tools.
• Versatile partial threading on a 5 1/2" length, allowing flexibility in clamping and adjustment applications.
• Compliance with major standards including ASME B18.2.1, SAE J429, RoHS 3, and REACH, ensuring quality and safety.

Professional Applications & Engineering Value

This Grade 5 steel hex head screw is engineered to address critical needs in industrial applications where strength and reliability are paramount. The zinc plated finish provides a protective barrier against corrosion, making it suitable for outdoor or moisture-exposed environments. With a 1/2"-20 UNF fine thread and Class 2A thread fit, it delivers superior clamping force and resistance to loosening under vibration, common in machinery and structural assemblies. The external hex drive and partially threaded design facilitate efficient installation and allow for precise adjustment in heavy-duty fastening tasks, reducing downtime and maintenance costs.

Specification Summary & Compliance

This screw features a 1/2"-20 UNF fine thread with Class 2A thread fit for precise dimensional accuracy. It meets ASME B18.2.1 and SAE J429 specifications, ensuring consistent performance in inch-based systems. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), it adheres to environmental and safety regulations for industrial use.