S-91771A291 12-24 x 1/2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable, long-lasting fastening
• Optimized for flush installation thanks to the standard flat head profile and 82° countersink angle, providing a smooth, secure finish
• Efficient and secure driving with the Phillips No. 3 drive style, reducing cam-out and ensuring proper torque application
• Reliable thread engagement with fully threaded UNC coarse threads and Class 2A fit, ensuring consistent performance and ease of assembly
• Broad industrial compliance meeting ASME B18.6.3 standards, RoHS 3, and REACH regulations for safe, quality-assured use
• Versatile right-hand threading designed for standard applications, simplifying installation and maintenance processes

Professional Applications & Engineering Value

This 12-24 UNC flat head screw is engineered to address critical challenges in industrial assembly, where corrosion resistance and high tensile strength are paramount. The passivated 18-8 stainless steel material provides excellent protection against rust and chemical exposure, making it suitable for demanding environments like machinery, automotive, and outdoor equipment. The fully threaded coarse UNC design ensures rapid installation and strong holding power, while the 82° countersink angle and flat head profile allow for a flush fit, reducing snagging and improving aesthetics. With a Phillips No. 3 drive, it offers efficient torque transfer, minimizing tool slippage. These features make it an ideal choice for applications requiring reliable, ASME B18.6.3 compliant fasteners that maintain integrity under stress and environmental factors.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including Class 2A thread fit for consistent assembly and UNC coarse threading. It is manufactured in compliance with ASME B18.6.3 specifications, ensuring reliability in mechanical applications. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility for industrial use.