S-92210A592 5/16"-18 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 and passivated finish, ideal for harsh industrial environments
• Exceptional tensile strength rated at 70,000 psi for reliable performance in high-stress applications
• Precision Class 3A thread fit ensures secure fastening with minimal backlash in demanding assemblies
• Hex drive design provides superior torque transmission and prevents cam-out during installation
• Standard 82° countersink angle allows for flush mounting in various materials without protrusion
• Full threading along 2 1/4" length offers maximum grip and adjustment flexibility
• Rockwell B55 hardness maintains thread integrity and resistance to wear over repeated use

Professional Applications & Engineering Value

These 5/16"-18 UNC flat head screws are engineered to address critical fastening challenges in industrial settings. The 18-8 stainless steel construction combined with passivated finish provides exceptional resistance to corrosion and chemical exposure, making them ideal for marine, food processing, and outdoor applications. The coarse UNC thread and Class 3A thread fit ensure rapid installation and vibration resistance in machinery, structural frameworks, and heavy equipment. The hex drive and flat head design with standard 82° countersink enable flush mounting in metal, wood, and composite materials, eliminating snag points while maintaining high tensile strength for long-term reliability.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread tolerance for precision fit. Features UNC coarse threading (5/16"-18) with right-hand direction and full threading along the 2 1/4" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe use in regulated industries.