S-91263A125 3-48 x 1/4" 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 under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in machinery and equipment.
• Zinc-plated alloy steel construction offers excellent corrosion resistance, extending service life in harsh industrial environments.
• Fully threaded design with UNC coarse threads enables faster installation and enhanced grip strength across the entire length.
• 82° countersink angle allows for a flush, low-profile finish, minimizing protrusion and improving aesthetic and functional integration.
• Rockwell C39 hardness ensures high durability and resistance to wear, maintaining integrity through repeated use.
• Compliance with ASTM F835, RoHS 3, and REACH guarantees adherence to industry standards for safety, environmental responsibility, and material quality.

Professional Applications & Engineering Value

These 3-48 UNC flat head screws are engineered to address common industrial challenges, such as vibration loosening and corrosion in machinery assemblies. Made from zinc-plated alloy steel, they provide robust protection against environmental factors, while the Class 3A thread fit and coarse UNC threading ensure quick, secure fastening in metal, plastic, and composite materials. Ideal for applications in automotive, aerospace, and electronic enclosures, the 82° countersink angle and fully threaded design facilitate seamless integration, reducing assembly time and enhancing structural stability. With high tensile strength and hardness, these screws deliver long-term reliability in high-stress environments, minimizing maintenance needs and downtime.

Specification Summary & Compliance

This product features precise Class 3A thread fit with UNC coarse threads, ensuring dimensional accuracy per industry standards. It complies with ASTM F835 for mechanical properties, RoHS 3 (2015/863/EU) for restricted hazardous substances, and REACH (EC 1907/2006) for chemical safety, affirming its suitability for global industrial use.