S-91253A329 5/16"-24 x 3/8" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 PSI for reliable performance in high-stress applications, reducing the risk of fastener failure.
• Class 3A thread fit ensures precise, tight engagement for secure fastening and vibration resistance in demanding environments.
• Black-oxide finish on alloy steel provides enhanced corrosion resistance and a durable, non-reflective surface ideal for industrial use.
• Hex drive design allows for easy installation and high torque application, minimizing slippage and tool wear.
• Fully threaded body offers maximum grip and holding power along the entire length for superior load distribution.
• 82° countersink angle enables a flush, low-profile fit in standard countersunk holes, improving aesthetics and safety.
• Compliance with ASTM F835, RoHS 3, and REACH guarantees material quality and environmental safety for global industrial standards.

Professional Applications & Engineering Value

This 5/16"-24 UNF flat head screw is engineered to address critical challenges in industrial assembly, where high tensile strength and precise thread fit are paramount. The black-oxide alloy steel construction resists corrosion and wear, extending service life in harsh conditions like machinery, automotive, and metal fabrication. Its fine UNF threads and Class 3A fit provide superior resistance to loosening under vibration, a common issue in dynamic systems. The hex drive and 82° countersink facilitate quick, secure installation, reducing assembly time and ensuring a flush finish that prevents snagging. Ideal for applications requiring reliable, high-performance fasteners, this screw delivers consistent engineering value by enhancing structural integrity and maintenance efficiency.

Specification Summary & Compliance

This product features a 5/16"-24 UNF fine thread with Class 3A precision for tight tolerances and optimal fit. It meets ASTM F835 specifications for mechanical properties and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability. The screw is fully threaded and designed with standard dimensions for consistent performance in industrial fastening applications.