S-91253A356 5/16"-24 x 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 in high-stress industrial environments, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide coating on alloy steel extends service life and maintains integrity in harsh conditions.
• Precise Class 3A thread fit guarantees tight, secure connections with minimal backlash, enhancing assembly accuracy and vibration resistance.
• Partially threaded design with fine UNF threads provides optimal grip and load distribution, ideal for applications requiring controlled clamping force.
• 82° countersink angle and flat head profile allow for flush mounting, improving aesthetics and preventing snagging in machinery.
• Hex drive (3/16") compatibility enables easy installation and removal with standard tools, boosting efficiency in maintenance and production.
• Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to industry standards for safety and environmental responsibility, simplifying regulatory approvals.

Professional Applications & Engineering Value

These 5/16"-24 UNF flat head screws are engineered to address common industrial challenges, such as vibration loosening and corrosion-induced degradation. Made from black-oxide alloy steel, they offer enhanced durability and corrosion resistance, making them suitable for demanding environments like automotive assemblies, heavy machinery, and aerospace components. The fine thread spacing and Class 3A thread fit provide superior holding power, reducing maintenance needs in high-load applications. With a partially threaded design and 82° countersink angle, they ensure seamless integration into precision equipment, minimizing protrusions and improving safety. Ideal for industrial fastening solutions, these screws deliver long-term reliability and performance in critical engineering projects.

Specification Summary & Compliance

This product features precise Class 3A thread fit and UNF fine threading with a thread size of 5/16"-24, ensuring tight tolerances per industry standards. It meets ASTM F835 specifications for mechanical properties, along with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming adherence to environmental and safety regulations. The manufacturing process maintains high dimensional accuracy, including a minimum thread length of 1 1/8" and consistent hardness of Rockwell C39, supporting reliable performance in professional applications.