S-91253A648 3/8"-16 x 5" 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 industrial applications, reducing the risk of fastener failure.
• Corrosion-resistant black-oxide coating on alloy steel enhances durability and provides protection in demanding environments, extending service life.
• Precision Class 3A thread fit ensures tight, secure fastening with minimal play, improving assembly accuracy and reducing loosening over time.
• Partially threaded design allows for controlled clamping force and easier alignment in assemblies, speeding up installation processes.
• Hex drive compatibility with a 7/32" drive size enables quick and secure tool engagement, facilitating efficient maintenance and reducing labor time.
• High hardness rating of Rockwell C39 provides excellent wear resistance, maintaining thread integrity through repeated use and harsh conditions.
• Compliance with ASTM F835, RoHS 3, and REACH standards guarantees material safety and regulatory adherence, ensuring suitability for global industrial markets.

Professional Applications & Engineering Value

This 3/8"-16 UNC flat head hex screw is engineered to address common challenges in heavy-duty fastening, such as vibration-induced loosening and environmental corrosion. The black-oxide alloy steel construction, combined with a Rockwell C39 hardness, offers superior resistance to wear and oxidation, making it ideal for machinery, construction, and automotive assemblies where durability is critical. The partially threaded and Class 3A fit design ensures precise engagement in industrial applications, minimizing the need for re-tightening and enhancing structural integrity. By integrating a flat head profile with an 82° countersink angle, it provides a flush finish that reduces protrusion risks, while the coarse thread spacing facilitates quick installation in tough materials, streamlining production workflows and reducing downtime.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNC thread type with a size of 3/8"-16. It meets manufacturing specifications under ASTM F835 and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability for industrial use.