S-91263A809 5/8"-11 x 2 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc plating, extending service life in harsh industrial environments
• Superior load-bearing capacity from 130,000 psi tensile strength, ideal for heavy-duty structural applications
• Precision threading with Class 3A fit ensures secure fastening and reduces the risk of cross-threading during installation
• High durability backed by Rockwell C37 hardness, maintaining integrity under repeated stress and vibration
• Easy installation and removal with 3/8" hex drive, providing reliable torque transfer without stripping
• Wide compatibility with UNC coarse threads, offering excellent grip in various materials including metal and wood
• Regulatory compliance with ASTM F835, RoHS 3, and REACH, ensuring safety and environmental standards are met

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 5/8"-11 UNC flat head screws deliver reliable performance in construction, machinery assembly, and heavy equipment manufacturing. The zinc-plated alloy steel construction provides enhanced corrosion protection, reducing maintenance costs in exposed or high-moisture environments. With a fully threaded right-hand design and coarse thread spacing, they ensure rapid installation and superior holding power in brittle or soft materials. The 82° countersink angle allows for flush mounting, minimizing protrusion risks while maintaining structural integrity. These features address common challenges like vibration loosening and material fatigue, making them a trusted choice for high-strength fastening solutions.

Specification Summary & Compliance

This product adheres to precise dimensional standards with Class 3A thread fit and UNC thread type, ensuring consistent performance across applications. Manufacturing complies with ASTM F835 specifications for mechanical properties and quality. Environmental and safety regulations are fully met, including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) adherence, confirming the absence of restricted hazardous substances. These certifications support global sourcing and use in regulated industries.