S-91263A568 1/4"-20 x 2 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 zinc-plated alloy steel construction extends service life and maintains integrity in harsh industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections, minimizing loosening in machinery and equipment.
• 82° countersink angle allows for a flush, low-profile installation, enhancing aesthetics and preventing snagging in assembled products.
• Hex drive design (5/32") enables easy installation and high torque application with standard tools, speeding up assembly processes.
• Partially threaded shank offers improved clamping force control, ideal for applications requiring precise joint compression.
• Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to rigorous industry and environmental standards, supporting global supply chain requirements.

Professional Applications & Engineering Value

This zinc-plated alloy steel flat head screw is engineered to address critical challenges in industrial assembly, such as vibration-induced loosening and environmental degradation. The UNC coarse thread and Class 3A thread fit provide superior holding power in metal-to-metal and wood applications, reducing maintenance needs in machinery, automotive frames, and structural frameworks. The 82° countersink angle ensures a seamless finish, while the hex drive facilitates efficient installation in confined spaces. With a Rockwell C39 hardness and robust tensile strength, it withstands dynamic loads and harsh conditions, making it a reliable choice for heavy-duty equipment, construction projects, and OEM manufacturing where durability and compliance are paramount.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with Class 3A thread fit for precise dimensional accuracy, ensuring consistent performance in threaded holes. It meets ASTM F835 specifications for mechanical properties and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and international industrial applications.