S-99894A441 1/2"-13 x 3 1/2" MS90725-121 Mil. Spec. Medium-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the cadmium plating extends service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 2A thread fit guarantees consistent engagement and secure fastening, preventing loosening under vibration.
• Partially threaded design allows for optimal clamping force distribution, ideal for materials requiring controlled tension.
• Heavy-duty Grade 5 steel construction with Rockwell C25 hardness provides excellent durability and wear resistance for long-term use.
• Coarse UNC threading enables quick installation and removal, saving time in assembly and disassembly processes.
• External hex drive offers easy tool access and high torque application, streamlining installation in confined spaces.

Professional Applications & Engineering Value

This 1/2"-13 UNC Grade 5 steel hex head screw is engineered to address critical challenges in heavy-duty industrial and construction settings. The combination of high tensile strength and Rockwell C25 hardness ensures it withstands extreme loads and repetitive stress, making it ideal for structural assemblies, machinery, and equipment where fastener integrity is paramount. The cadmium plated finish provides robust protection against corrosion, extending service life in outdoor or chemically aggressive environments. Its partially threaded design and Class 2A thread fit deliver precise clamping force, reducing the risk of joint failure and enhancing safety in applications like steel framing, automotive components, and industrial machinery. By meeting MS90725-121 specifications, it offers reliability for engineers and procurement teams seeking compliant, high-performance industrial fasteners.

Specification Summary & Compliance

This fastener features a 1/2"-13 UNC coarse thread with Class 2A thread fit for consistent dimensional accuracy and secure engagement. It complies with MS90725-121 specifications and is manufactured from Grade 5 steel to ensure mechanical properties align with industry standards. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements, supporting environmental and safety regulations in global supply chains.