S-91253A912 1"-8 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 under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments and minimizing maintenance needs.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections, enhancing assembly integrity and safety.
• Fully threaded design with coarse UNC spacing allows for faster installation and maximum grip length, improving efficiency in high-volume production settings.
• 82° countersink angle and flat head profile enable flush mounting for a smooth surface finish, ideal for applications where protrusion is not acceptable.
• Heavy-duty 5/8" hex drive offers high torque capability and easy installation with standard tools, reducing assembly time and labor costs.
• Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to industry standards for quality and environmental safety, providing peace of mind for regulated sectors.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these black-oxide alloy steel flat head screws address critical challenges in machinery, construction, and automotive assemblies. The Class 3A UNC thread with coarse spacing ensures rapid, secure fastening in materials prone to vibration, while the 130,000 psi tensile strength and Rockwell C37 hardness prevent stripping and deformation under load. The 82° countersink angle facilitates seamless integration into countersunk holes, eliminating surface irregularities and enhancing aerodynamic or aesthetic profiles. Ideal for structural frameworks and high-stress equipment, these screws deliver consistent performance, reducing downtime and maintenance costs in demanding engineering environments.

Specification Summary & Compliance

This product features precise Class 3A thread fit per UNC standards, with a 1"-8 coarse thread and right-hand direction for optimal engagement. Dimensions include a 2" length, 1.938" head diameter, and 5/8" hex drive size, manufactured to ASTM F835 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry reliability.