S-91771A971 1/4"-20 x 3/4" 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 load-bearing performance
• Precise flush mounting enabled by standard 100° countersink angle and flat head design for seamless surface integration
• Optimized drive engagement through No. 3 Phillips drive style, reducing cam-out risks during installation
• Consistent threading performance with fully threaded UNC coarse pattern and Class 2A fit for secure fastening
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards (RoHS 3, REACH)
• Versatile industrial compatibility with 1/4"-20 thread size and 3/4" length for diverse assembly applications

Professional Applications & Engineering Value

These passivated 18-8 stainless steel flat head screws deliver critical corrosion protection and mechanical reliability in demanding environments. The fully threaded UNC coarse pattern ensures maximum thread engagement in various materials, while the 100° countersink angle provides flush surface mounting for applications where protrusion isn't acceptable. The Phillips No. 3 drive offers efficient installation torque transfer, making these industrial fasteners ideal for machinery assembly, electrical enclosures, and structural components requiring high tensile strength and environmental compliance. Their Class 2A thread fit maintains consistent tolerance across production runs, reducing assembly variability in automated or high-volume manufacturing settings.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 standards with Class 2A thread fit precision. Features UNC coarse threading (1/4"-20) and full threading along the 3/4" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Mechanical properties include 80,000 psi tensile strength and Rockwell B80 hardness. Standard 100° countersink angle and flat head profile ensure consistent performance across industrial applications.