S-90429A121 3-48 x 3/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating on alloy steel, ideal for harsh industrial environments.
• Superior holding power from 130,000 psi tensile strength and Rockwell C39 hardness, ensuring reliable fastening under high stress.
• Precise, vibration-resistant fit with Class 3A thread tolerance for secure assemblies and reduced loosening risks.
• Efficient installation and removal using the hex drive design, allowing high torque application without slippage.
• Optimal flush seating with the standard 82° countersink angle, providing a smooth surface finish in assembled products.
• Enhanced durability in coarse threading with UNC 3-48 fully threaded design, offering quick assembly and strong grip in various materials.
• Compliance with major industry standards including ASME B18.3 and ASTM F835, ensuring consistent quality and safety.

Professional Applications & Engineering Value

This 3-48 UNC flat head screw is engineered to address critical challenges in precision assemblies, such as minimizing component failure and maintaining structural integrity under dynamic loads. The black-oxide alloy steel construction provides excellent resistance to oxidation and wear, extending service life in demanding applications like machinery, automotive systems, and electronic enclosures. Its hex drive and fully threaded coarse design enable rapid, secure fastening, reducing installation time and improving production efficiency. By meeting stringent standards, these screws ensure reliability in high-stress environments, making them a trusted choice for engineers seeking durable, RoHS and REACH compliant fastening solutions that uphold performance and regulatory requirements.

Specification Summary & Compliance

The screw features precise Class 3A thread fit and UNC coarse threading for accurate engagement, with dimensions including a 3/4" length and 0.099" thread diameter. It complies with ASME B18.3 and ASTM F835 specifications, ensuring consistent manufacturing quality. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting environmental and safety standards in global supply chains.