S-91253A806 5/8"-11 x 3" 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 in high-stress industrial applications, reducing the risk of fastener failure.
• Class 3A thread fit provides superior precision and tight tolerances for secure, vibration-resistant assemblies in demanding environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and durability, extending service life in harsh conditions.
• 3/8" hex drive design allows for easy installation and high torque application, improving assembly efficiency and reducing labor time.
• Fully threaded body ensures maximum grip and load distribution along the entire length, enhancing joint stability.
• 82° countersink angle with standard flat head profile enables flush mounting for a clean, professional finish and improved safety.
• Compliance with ASME B18.3 and ASTM F835 standards guarantees consistent quality and interoperability in regulated industrial settings.

Professional Applications & Engineering Value

This 5/8"-11 UNC flat head screw is engineered to address critical challenges in heavy-duty industrial applications, such as machinery assembly, structural frameworks, and automotive components. The black-oxide alloy steel construction provides excellent resistance to wear and environmental factors, while the coarse thread spacing and right-hand thread direction facilitate quick installation and reliable holding power in materials like metal and hardened plastics. With a Rockwell C37 hardness and fully threaded design, it minimizes loosening under vibration and dynamic loads, ensuring long-term integrity in demanding engineering projects. Ideal for use in construction, manufacturing, and equipment maintenance, this screw delivers consistent performance where precision and durability are paramount.

Specification Summary & Compliance

This product features precise Class 3A thread fit per UNC standards, with dimensions including a 3" length, 5/8"-11 thread size, and 1.188" head diameter. It complies with ASME B18.3 and ASTM F835 manufacturing specifications, ensuring high-quality production. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global industrial use.