S-91773A544 1/4"-20 x 1 1/4" ASME B18.6.3 Stainless Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction and passivated finish, ensuring long-term reliability in harsh environments
• Exceptional mechanical strength delivering 100,000 psi tensile strength and Rockwell B100 hardness for heavy-duty applications
• Precision thread engagement with UNC coarse threads and Class 2A fit for secure fastening and vibration resistance
• Optimized drive efficiency through Phillips No. 3 drive design, enabling quick installation with standard tools
• Enhanced user comfort and safety with rounded head profile that eliminates sharp edges and reduces snagging
• Full-threaded design providing maximum grip length and uniform stress distribution across the entire fastener
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards (RoHS 3, REACH)

Professional Applications & Engineering Value

These 1/4"-20 UNC fully threaded screws with rounded head design solve critical industrial fastening challenges where corrosion resistance and structural integrity are paramount. The 18-8 Stainless Steel composition combined with passivated finish provides exceptional protection against chemical exposure and atmospheric corrosion, making them ideal for marine equipment, food processing machinery, and outdoor industrial applications. The coarse thread configuration ensures rapid installation and superior holding power in various materials, while the Phillips drive offers familiar, efficient torque transfer. Engineered to withstand high-stress conditions with 100,000 psi tensile strength, these machine screws deliver reliable performance in assembly lines, mechanical systems, and equipment maintenance where vibration resistance and long-term durability are essential.

Specification Summary & Compliance

This 1/4"-20 x 1-1/4" screw features precision UNC coarse threads with Class 2A fit tolerance for consistent engagement and reliable performance. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. The product meets stringent environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance, ensuring safe use across global industrial markets. The fully threaded design maintains uniform diameter throughout the 1-1/4" length for maximum fastening versatility.