S-91253A096 3-48 x 1/2" 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 under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel extends service life in harsh industrial environments, minimizing maintenance and replacement costs.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections, enhancing assembly integrity and safety.
• Full threading along the entire 1/2" length offers maximum grip and uniform load distribution, ideal for applications requiring deep engagement.
• 82° countersink angle allows for a flush, low-profile installation, improving aesthetics and reducing snag hazards in machinery and equipment.
• Hex drive design with 1/16" drive size enables easy installation and removal with standard tools, speeding up assembly and reducing labor time.
• Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations, supporting sustainable and safe manufacturing practices.

Professional Applications & Engineering Value

Engineered for industrial and mechanical assemblies, these 3-48 UNC flat head screws in black-oxide alloy steel address common challenges like corrosion, vibration loosening, and high-load demands. The coarse thread spacing and Class 3A thread fit provide excellent holding power in materials such as metal and plastic, reducing the need for frequent retightening. With a Rockwell C39 hardness and fully threaded design, they ensure durability in applications like automotive components, electronics enclosures, and machinery where reliability is critical. The 82° countersink angle facilitates seamless integration into tapered holes, minimizing protrusion and enhancing safety in moving parts. Ideal for B2B procurement, these screws deliver consistent performance in corrosive or high-stress environments, backed by rigorous standards compliance.

Specification Summary & Compliance

This product features precise dimensional accuracy with Class 3A thread fit per UNC standards, ensuring tight tolerances for secure fastening. It meets ASTM F835 specifications for mechanical properties and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and material restrictions adherence. Threading follows UNC coarse thread with right-hand direction, and the flat head profile supports standard industrial use.