S-92210A024 4-48 x 3/8" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh environments and extended service life.
• Precise thread engagement and reliable fastening due to Class 3A thread fit and UNF fine thread profile, minimizing loosening under vibration.
• High mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding structural applications.
• Efficient installation and removal enabled by the hex drive design, providing superior torque transmission compared to slotted drives.
• Flush mounting capability with the standard 82° countersink angle and flat head, ensuring a smooth surface finish.
• Full thread coverage along the 3/8" length for maximum grip and load distribution across the entire fastened joint.
• Compliance with major industry standards including ASME B18.3, ensuring dimensional consistency and interoperability.

Professional Applications & Engineering Value

This 4-48 UNF Class 3A flat head screw is engineered for precision assemblies where space is constrained and a flush surface is critical. The combination of 18-8 stainless steel and a passivated finish provides excellent resistance to oxidation and chemical exposure, solving common failure points in industrial machinery, electronics enclosures, and marine equipment. The fine thread (UNF) and Class 3A fit ensure tight tolerances and vibration resistance, making it suitable for high-stress applications. The hex drive allows for higher torque application without cam-out, speeding up production while the 82° countersink seamlessly integrates into precision-machined components, enhancing both aesthetic and functional integrity in automated and manual assembly lines.

Specification Summary & Compliance

This fastener adheres to Class 3A thread tolerances for a tighter fit as per the UNF (Unified National Fine) standard. Manufacturing and dimensional specifications conform to ASME B18.3. The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for use in regulated markets.