S-91253A815 5/8"-11 x 5 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 psi ensures reliable performance under heavy loads, reducing the risk of fastener failure in demanding applications.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in industrial machinery.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and durability, extending service life in harsh environments.
• Partially threaded design with UNC coarse threads allows for faster installation and improved grip in softer materials, saving assembly time.
• 82° countersink angle and flat head profile enable a flush, seamless finish that minimizes protrusion and enhances safety in assembled structures.
• Hex drive (3/8") facilitates easy installation and removal with standard tools, improving maintenance efficiency.
• Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to rigorous quality and environmental standards, supporting sustainable procurement.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these 5/8"-11 UNC flat head screws address critical challenges in machinery assembly, construction, and automotive sectors. The black-oxide alloy steel construction, combined with a Rockwell C37 hardness, provides excellent resistance to wear and environmental factors, reducing maintenance needs. The coarse UNC threading and partial threading design ensure rapid, secure fastening in materials like steel and aluminum, preventing loosening under vibration. Ideal for use in frames, brackets, and structural components, these screws deliver reliable high tensile strength and flush mounting capabilities, enhancing both performance and safety in engineered systems.

Specification Summary & Compliance

This product features precise Class 3A thread fit and UNC coarse threads with a thread size of 5/8"-11, ensuring dimensional accuracy per inch system standards. It is manufactured in compliance with ASTM F835 specifications for mechanical properties and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial use without hazardous substances.