S-92210A418 8-32 x 2 1/4" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding industrial applications.
• Precise, secure fastening through Class 3A thread fit and UNC coarse threading, reducing the risk of cross-threading and ensuring consistent performance.
• Efficient installation and removal with a 3/32" hex drive, providing superior torque transmission and reducing tool slippage.
• Optimal flush mounting thanks to the standard flat head profile and 82° countersink angle, ideal for applications requiring a smooth surface finish.
• Full-length threading for maximum grip and holding power across the entire 2 1/4" length, enhancing joint integrity.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 8-32 UNC flat head screw is engineered to address critical challenges in industrial assembly, where vibration resistance, material compatibility, and long-term durability are paramount. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to oxidation and chemical exposure, making it suitable for machinery, marine equipment, and outdoor structures. The hex drive design ensures high torque application without cam-out, while the Class 3A thread fit and coarse thread spacing facilitate quick assembly and reduce the likelihood of thread stripping in soft or brittle materials. Fully threaded along its 2 1/4" length, it offers uniform load distribution, preventing loosening under dynamic stresses and enhancing the reliability of heavy-duty fasteners in automotive, aerospace, and construction applications.

Specification Summary & Compliance

This screw adheres to Class 3A thread tolerances for precision fit, conforms to UNC (Unified National Coarse) thread standards, and is manufactured in compliance with ASME B18.3 specifications. It 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 industries.