S-91283A652 2"-4 1/2 x 5" ASME B18.2.1, ASTM A449 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 90,000 psi provides reliable performance in high-stress applications, reducing the risk of fastener failure.
• Grade 5 steel construction with Rockwell B90 hardness ensures superior durability and resistance to wear in demanding industrial environments.
• 2"-4 1/2 UNC coarse threading with Class 2A fit offers quick assembly and secure fastening, minimizing installation time and vibration loosening.
• Partially threaded design concentrates clamping force where needed, enhancing joint stability and preventing material damage.
• 3" hex head with external drive allows for high-torque application using standard tools, improving efficiency in maintenance and construction.
• Compliance with ASME B18.2.1/ASTM A449 standards guarantees consistent quality and interoperability with other components.
• RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence for global industrial supply chains.

Professional Applications & Engineering Value

This Grade 5 hex head screw is engineered to address critical challenges in heavy-duty industrial applications, such as structural steel connections, machinery assembly, and construction projects. The steel material and Rockwell B90 hardness provide excellent resistance to shear and tensile stresses, preventing deformation under load. Its 2"-4 1/2 UNC coarse thread design ensures rapid installation and reliable grip in coarse-grained materials, reducing the risk of cross-threading. The partially threaded configuration focuses clamping force on specific sections, ideal for applications requiring precise load distribution. With an external hex drive and large 3" head width, it enables easy access and high torque application in confined spaces, enhancing operational efficiency and safety in demanding environments like manufacturing plants and infrastructure development.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including Class 2A thread fit for consistent assembly and UNC coarse threading with sizes from 2" to 4 1/2". It meets ASME B18.2.1 and ASTM A449 specifications for mechanical properties and manufacturing quality. Regulatory compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it is free from hazardous substances and suitable for international industrial use.