S-98164A065 4-40 x 1/2" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh environments
• Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance
• Precision thread engagement with Class 3A fit and 4-40 UNC coarse spacing ensuring secure fastening
• Easy installation and removal featuring hex drive design for efficient tool engagement
• Optimized load distribution through rounded button head profile reducing surface stress
• Full threading capability providing maximum grip length across the entire 1/2" shaft
• Regulatory compliance assurance meeting ASME B18.3 standards and RoHS/REACH environmental requirements

Professional Applications & Engineering Value

These 316 stainless steel rounded head screws with 4-40 UNC coarse threading and Class 3A precision fit address critical industrial challenges where corrosion resistance and mechanical reliability are paramount. The passivated finish significantly enhances protection against chemical exposure and oxidation, making them ideal for marine, chemical processing, and food industry applications. The combination of 70,000 psi tensile strength and fully threaded design ensures maximum clamping force and vibration resistance in demanding assemblies. The hex drive configuration allows for secure tool engagement during installation, while the rounded button head profile provides a finished appearance and eliminates sharp edges in exposed applications.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 standards with Class 3A thread fit for superior dimensional accuracy. Features 4-40 UNC coarse thread with right-hand orientation and 1/2" length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.