S-98164A288 5/16"-18 x 3" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh chemical and marine environments
• Superior torque transmission through hex drive design with 3/16" drive size, preventing stripping during high-torque installations
• Reliable thread engagement with Class 3A thread fit and UNC coarse threading, ensuring secure fastening in demanding applications
• Enhanced mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness, providing long-term structural integrity
• Full-length threading offers maximum grip along the entire 3" length, eliminating weak points in critical connections
• Rounded button head design provides a low-profile, finished appearance while minimizing snagging hazards
• Comprehensive compliance with ASME B18.3 manufacturing standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

Engineered for demanding industrial applications where corrosion resistance and mechanical reliability are paramount, these 316 stainless steel rounded head screws deliver exceptional performance in chemical processing, marine equipment, and food processing machinery. The combination of UNC coarse threading and Class 3A thread fit ensures rapid installation and vibration resistance in heavy machinery assemblies. The passivated finish enhances the natural corrosion resistance of 316 stainless steel, making these hex drive screws ideal for environments exposed to chlorides, acids, and extreme weather conditions. With fully threaded design and 70,000 psi tensile strength, they provide uniform stress distribution and reliable fastening in structural applications where failure is not an option.

Specification Summary & Compliance

These rounded head screws feature precision 5/16"-18 UNC threads with Class 3A thread fit for superior dimensional accuracy and engagement. Manufacturing complies with ASME B18.3 specifications for consistent quality and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use in regulated industries. The coarse thread spacing and right-hand thread direction provide optimal performance in standard industrial applications requiring reliable, high-strength fastening solutions.