S-91263A612 1/2"-13 x 2 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated alloy steel construction, ensuring long-lasting performance in harsh industrial environments.
• Exceptional tensile strength of 130,000 psi provides reliable fastening for heavy-duty applications, reducing the risk of mechanical failure.
• Precise Class 3A thread fit ensures smooth installation and secure engagement, minimizing assembly time and improving joint integrity.
• 82° countersink angle and flat head design allow for a flush finish, enhancing safety and aesthetics in machined surfaces.
• Partially threaded shank offers optimal grip and clamping force, ideal for materials requiring controlled tension distribution.
• Hex drive (5/16") compatibility enables easy installation with standard tools, boosting efficiency in high-volume assembly lines.
• Compliance with ASTM F835, RoHS 3, and REACH guarantees adherence to industry standards, supporting sustainable and safe manufacturing practices.

Professional Applications & Engineering Value

This 1/2"-13 UNC flat head screw is engineered from zinc-plated alloy steel to address common industrial challenges such as vibration loosening and environmental degradation. The coarse thread spacing and Class 3A thread fit provide excellent holding power in soft materials or where rapid assembly is critical, reducing maintenance needs. With a Rockwell C39 hardness and high tensile strength, it withstands extreme loads in machinery, construction, and automotive frameworks. The 82° countersink angle ensures a seamless fit in pre-drilled holes, preventing protrusions that could compromise equipment safety. Ideal for heavy-duty fastening in structural applications, this screw delivers reliability where precision and durability are paramount.

Specification Summary & Compliance

This product adheres to Class 3A thread fit and UNC coarse thread standards with precise dimensions: 1/2"-13 thread size, 2-1/2" length, and 2" minimum thread length. Manufactured in accordance with ASTM F835 specifications, it meets rigorous performance criteria. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are upheld for industrial use.