S-91253A820 5/8"-11 x 8" 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 tighter tolerances for secure, vibration-resistant assemblies in critical machinery.
• Black-oxide coating on alloy steel enhances corrosion resistance and durability, extending service life in harsh environments.
• Hex drive design allows for high-torque installation with standard tools, improving assembly efficiency and reducing stripping risks.
• Partially threaded shank offers optimal grip and clamping force control, ideal for materials requiring precise joint security.
• Coarse UNC threading enables faster installation and better performance in soft materials or where rapid disassembly is needed.
• Compliance with ASTM F835, RoHS 3, and REACH ensures environmental safety and meets rigorous industry standards for quality and reliability.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 5/8"-11 UNC flat head screws combine black-oxide alloy steel construction with a hex drive to address common challenges like vibration loosening and corrosion. The Class 3A thread fit and coarse thread spacing provide exceptional holding power in heavy machinery, structural steel frameworks, and equipment assembly, where precise alignment and durability are critical. The partially threaded design minimizes material stress by concentrating clamping force, making these screws ideal for applications in construction, automotive, and manufacturing sectors that require robust, long-lasting fastening solutions without compromising on compliance or performance.

Specification Summary & Compliance

This screw features a Class 3A thread fit with UNC coarse threading for precise engagement, and dimensions including an 8" length and 5/8"-11 thread size. Manufactured to meet ASTM F835 specifications, it ensures consistent quality and performance. Additionally, the product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for industrial use.