S-92210A403 1-72 x 5/16" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 Stainless Steel with passivated finish, ideal for harsh environments and long-term reliability.
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness, ensuring high load-bearing capacity and durability.
• Precision Class 3A thread fit for secure, vibration-resistant fastening in critical assemblies requiring fine thread accuracy.
• Efficient hex drive installation (0.050" drive size) allowing for high torque application and reduced risk of stripping.
• Full threading and standard 82° countersink for flush mounting and uniform stress distribution in precision-machined components.
• Compliance with ASME B18.3 standards guaranteeing dimensional consistency and interchangeability in professional applications.
• Environmentally compliant with RoHS 3 and REACH regulations, ensuring safe use in regulated industries.

Professional Applications & Engineering Value

This 1-72 UNF flat head screw is engineered to address common industrial challenges such as corrosion, vibration loosening, and precise assembly requirements. The 18-8 Stainless Steel material, combined with a passivated finish, provides excellent resistance to oxidation and chemical exposure, making it suitable for electronics, aerospace, and marine equipment. The fine UNF thread and Class 3A fit ensure tight tolerances and reliable performance in high-vibration environments, while the hex drive design facilitates quick and secure installation with standard tools. Ideal for applications demanding flush mounting and high tensile strength, these screws offer long-term reliability and reduced maintenance in industrial screw assemblies.

Specification Summary & Compliance

This screw adheres to ASME B18.3 specifications, ensuring precise dimensions including a 1-72 UNF thread size with Class 3A thread fit for superior accuracy. It features a fully threaded design with a standard 82° countersink angle and right-hand thread direction. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms its environmental safety for global industrial use.