S-90909A531 5/16"-18 x 1/2" Stainless Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh chemical and marine environments
• Exceptional mechanical strength offering 70,000 psi tensile strength for reliable performance under high-stress conditions
• Precise thread engagement with Class 3A thread fit ensuring secure fastening and vibration resistance
• Enhanced durability from Rockwell B70 hardness and passivated finish, providing extended service life
• Efficient installation with hex drive and fully threaded UNC coarse thread design for quick assembly
• Improved load distribution through the integrated flange, reducing surface pressure and material damage
• Regulatory compliance meeting RoHS 3 and REACH standards for safe use in industrial applications

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 316 stainless steel rounded head screws deliver critical performance where corrosion and mechanical stress are concerns. The passivated finish enhances surface protection against oxidization, while the UNC coarse thread and Class 3A thread fit provide superior holding power in soft materials or high-vibration environments like machinery, marine hardware, and chemical processing equipment. The flanged design eliminates the need for separate washers, simplifying assembly and distributing clamp load effectively to prevent joint failure. With full threading and a hex drive, these screws ensure rapid, secure installations in time-sensitive maintenance and production lines.

Specification Summary & Compliance

This screw adheres to UNC thread standards with a Class 3A thread fit for precise dimensional accuracy. Manufactured from 316 stainless steel with a passivated finish, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements, ensuring environmental and safety standards are upheld for industrial use.