S-99894A517 5/8"-11 x 2 1/2" MS90725-166 Mil. Spec. Medium-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Durability: Grade 5 steel construction provides a high tensile strength of 120,000 PSI, ensuring reliable performance in demanding applications.
• Superior Corrosion Resistance: Cadmium plating offers excellent protection against rust and environmental degradation, extending the fastener's service life.
• Optimized for Heavy-Duty Use: The coarse UNC thread and partial threading design enhance grip and reduce the risk of stripping in tough materials.
• Secure and Efficient Installation: The external hex head drive allows for high torque application with standard tools, ensuring a tight and secure fit.
• Precision Thread Fit: Class 2A thread tolerance ensures consistent, reliable engagement with mating components for a secure assembly.
• Proven Hardness: Rockwell C25 hardness rating provides excellent resistance to wear and deformation under load.
• Regulatory Compliance: Meets MS90725-166 specifications and is compliant with RoHS 3 and REACH, ensuring safety and environmental standards are met.

Professional Applications & Engineering Value

This 5/8"-11 UNC Grade 5 steel hex head screw is engineered to solve critical challenges in heavy-duty industrial applications. The cadmium plated finish provides a robust barrier against corrosion, making it ideal for use in harsh environments where moisture and chemicals are present. The coarse thread and partial threading design ensure superior holding power in materials like steel and cast iron, reducing the likelihood of thread failure under high vibration or dynamic loads. Its external hex drive facilitates quick and secure installation with common tools, streamlining assembly processes in construction, machinery, and automotive sectors. By combining high tensile strength and precise Class 2A thread fit, this fastener delivers consistent performance, minimizing downtime and maintenance costs in critical assemblies.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including a Class 2A thread fit for consistent engagement and UNC coarse thread specifications. It is manufactured in compliance with MS90725-166 and meets critical regulatory requirements such as RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it is free from hazardous substances and safe for industrial use. The specifications confirm its suitability for high-strength applications where reliability and compliance are paramount.