S-92210A332 1/4"-28 x 5/8" 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.
• High-strength reliability offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding, heavy-duty applications.
• Precise, secure fastening ensured by Class 3A thread fit and fine UNF threads, minimizing the risk of loosening under vibration.
• Efficient installation and removal with a 5/32" hex drive, providing a positive grip and reducing tool slippage.
• Flush, low-profile seating due to the standard flat head with an 82° countersink angle, perfect for applications requiring a smooth surface.
• Full-thread engagement along the 5/8" length for maximum grip and load distribution in assembled components.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety.

Professional Applications & Engineering Value

This 1/4"-28 UNF Flat Head Screw is engineered to address critical challenges in industrial fastening, such as vibration-induced loosening and corrosion in demanding environments. The 18-8 Stainless Steel construction, enhanced by a passivated finish, provides exceptional resistance to rust and chemical exposure, making it suitable for machinery, marine equipment, and outdoor structures. The Class 3A thread fit and fine threading ensure tight, reliable connections that withstand dynamic loads, while the hex drive allows for efficient torque application in confined spaces. Ideal for applications requiring a flush mount, such as automotive assemblies and precision instruments, this screw delivers consistent performance and reduces maintenance needs, enhancing operational efficiency and longevity in industrial fastening systems.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 3A thread fit for superior tolerance and a UNF fine thread with 1/4"-28 size. It is manufactured in compliance with ASME B18.3 specifications and meets regulatory requirements such as RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring environmental safety and quality assurance for industrial use.