S-91772A563 1/4"-28 x 1 1/4" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh industrial environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
• Precise thread engagement with Class 2A fit and UNF fine threading, providing secure fastening and vibration resistance
• Optimized drive performance featuring Phillips No. 3 drive for efficient installation and reduced cam-out risk
• Full-threaded design delivering maximum grip length and uniform stress distribution across the entire fastener
• Standard-compliant manufacturing meeting ASME B18.6.3 specifications for consistent quality and interchangeability
• Environmental compliance with RoHS 3 and REACH regulations, ensuring safe use across global markets

Professional Applications & Engineering Value

This 1/4-28 UNF pan head screw delivers exceptional engineering value through its passivated 18-8 stainless steel composition, which provides outstanding corrosion resistance for demanding environments including marine, chemical processing, and outdoor equipment. The fine UNF threading and Class 2A thread fit ensure precise engagement in tapped holes, reducing the risk of cross-threading while maintaining vibration resistance in machinery and assembly applications. The rounded pan head profile with Phillips No. 3 drive offers a balanced combination of low-profile design and efficient torque transmission, making it ideal for applications where space constraints and reliable fastening are critical. These industrial screws are engineered to withstand rigorous operating conditions while maintaining their mechanical integrity and corrosion-resistant properties.

Specification Summary & Compliance

This fastener features precision 1/4"-28 UNF fine threads with Class 2A thread fit tolerance for consistent engagement and interchangeability. Manufacturing complies with ASME B18.6.3 standards, ensuring dimensional accuracy and performance reliability. The screw maintains full regulatory compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental directives, confirming its suitability for global industrial applications requiring restricted substance control.