S-90909A212 5/16"-18 x 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 environments and chemical exposure
• Enhanced durability and strength from 70,000 psi tensile strength and Rockwell B70 hardness, preventing stripping and deformation
• Precise, reliable fastening ensured by Class 3A thread fit for tight tolerances and vibration resistance
• Easy installation and removal with 3/16" hex drive and flanged design, eliminating the need for separate washers
• Excellent thread engagement from fully threaded UNC coarse threads, providing quick assembly in various materials
• Improved material compatibility with passivated finish, reducing galling and increasing service life
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for safe, sustainable use in global markets

Professional Applications & Engineering Value

This 316 stainless steel flanged button head screw delivers exceptional performance in demanding industrial settings where corrosion resistance and mechanical reliability are critical. The UNC coarse threads and Class 3A precision fit ensure secure fastening in soft metals, plastics, and wood, reducing the risk of cross-threading and loosening under dynamic loads. The integrated flange distributes clamping force evenly, preventing surface damage and simplifying assembly in automotive, marine, and food processing equipment. With a passivated finish enhancing its innate corrosion resistance, this screw withstands aggressive chemicals, saltwater, and high humidity, making it ideal for offshore platforms, chemical plants, and outdoor machinery. Its fully threaded design and hex drive allow for quick, tool-friendly installation, streamlining maintenance and reducing downtime in production lines.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC coarse thread with Class 3A thread fit for high precision and consistent performance. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence. Manufactured from 316 stainless steel with a passivated finish, it meets industry standards for corrosion resistance and mechanical properties, including a tensile strength of 70,000 psi and Rockwell B70 hardness.