S-97181A128 1/4"-20 x 1 1/4" ASME B18.6.3 Stainless Steel Pan Head Combination Phillips/Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and passivated finish, ideal for harsh chemical and marine environments
• Exceptional mechanical strength delivering 100,000 psi tensile strength and Rockwell B100 hardness for reliable performance under heavy loads
• Versatile installation options with combined Phillips/Slotted drive for flexible tool compatibility and reduced tool stripping
• Precision threading with Class 2A fit UNC coarse threads ensuring secure fastening and vibration resistance in industrial applications
• Full-threaded design providing maximum grip length and uniform stress distribution across the entire fastener
• Standard-compliant manufacturing meeting ASME B18.6.3 specifications for consistent quality and dimensional accuracy
• Environmental compliance with RoHS 3 and REACH standards for safe use in regulated industries

Professional Applications & Engineering Value

These 1/4"-20 UNC Rounded Head Screws deliver critical performance advantages in demanding industrial environments where corrosion resistance and mechanical reliability are paramount. The 316 Stainless Steel composition combined with passivated finish provides exceptional protection against chemical attack, saltwater exposure, and industrial contaminants, making them ideal for marine equipment, chemical processing plants, and food processing machinery. The pan head design with Phillips/Slotted drive offers versatile installation options while maintaining a low-profile appearance. With fully threaded construction and Class 2A fit, these screws ensure maximum thread engagement and vibration resistance in assembly applications where loosening under dynamic loads is a concern. The coarse UNC threading facilitates quicker installation and reduced cross-threading risks in production environments.

Specification Summary & Compliance

These rounded head screws feature precise 1/4"-20 UNC coarse threads with Class 2A fit tolerance for reliable engagement and consistent performance. Manufacturing complies with ASME B18.6.3 standards ensuring dimensional accuracy and mechanical properties. The fasteners are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for use in regulated industries and international markets requiring strict material compliance.