S-92210A176 5/16"-18 x 3 1/4" ASME B18.3, ASTM F879 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, ideal for harsh environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term performance
• Precise Class 3A thread fit ensures smooth assembly and secure fastening in demanding applications
• Full threading and coarse 5/16"-18 UNC pattern provides maximum grip and faster installation
• Standard 82° countersink angle and flat head design delivers a flush, professional finish
• Hex drive (3/16") compatibility allows for high-torque installation with common tools
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees quality and environmental safety

Professional Applications & Engineering Value

This 5/16"-18 UNC flat head screw is engineered to address critical industrial challenges, including vibration loosening and environmental degradation. Made from 18-8 stainless steel with a passivated finish, it resists corrosion in marine, chemical, and outdoor settings. The coarse thread and Class 3A fit enhance grip in soft materials and reduce cross-threading risks, while the fully threaded design ensures consistent clamping force. Ideal for machinery, structural assemblies, and equipment requiring flush mounting, this screw combines high tensile strength with reliable performance under stress, minimizing maintenance and downtime.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC coarse thread with Class 3A thread fit for precise dimensional accuracy. It is manufactured in accordance with ASME B18.3 specifications and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.