S-91253A355 3/8"-24 x 1" 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 and maintains integrity in harsh industrial environments.
• Precise Class 3A thread fit with fine UNF threading provides excellent vibration resistance and secure fastening, minimizing loosening over time.
• Fully threaded design allows for maximum grip and load distribution along the entire length, enhancing joint stability in assembled components.
• Standard 82° countersink angle enables a flush fit in countersunk holes, improving aesthetics and reducing snagging risks in machinery.
• Hex drive compatibility with a 7/32" drive size offers easy installation and high torque application, speeding up assembly processes.
• Compliance with industry standards including ASME B18.3 and ASTM F835 ensures consistent quality, reliability, and interchangeability in professional settings.

Professional Applications & Engineering Value

This 3/8"-24 UNF flat head screw is engineered to address critical challenges in industrial and mechanical assemblies, where vibration resistance, high tensile demands, and environmental durability are paramount. The black-oxide alloy steel construction provides robust protection against corrosion and wear, making it ideal for automotive, aerospace, and heavy machinery applications. Its fine thread spacing and Class 3A thread fit ensure tight, secure connections that withstand dynamic loads and reduce maintenance needs. The fully threaded design and 82° countersink angle facilitate seamless integration into components, offering a low-profile solution that enhances safety and efficiency. By meeting rigorous standards like ASME B18.3, this screw delivers consistent performance, minimizing downtime and supporting long-term operational reliability in industrial screws applications.

Specification Summary & Compliance

This product adheres to precise dimensional tolerances, including a Class 3A thread fit for high accuracy and a UNF thread type with fine spacing. It complies with ASME B18.3 and ASTM F835 specifications, ensuring manufacturing consistency and performance reliability. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming environmental safety and regulatory adherence for global industrial use.