S-91771A626 3/8"-16 x 1 1/4" 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, ensuring long-term reliability in harsh environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for heavy-duty applications
• Precise flush mounting enabled by the 82° countersink angle and standard flat head profile for seamless surface integration
• Optimized driving efficiency through the Phillips No. 4 drive design, reducing cam-out risks during installation
• Reliable thread engagement with fully threaded UNC coarse threads and Class 2A fit for consistent clamping force
• Broad industrial compliance meeting ASME B18.6.3 specifications plus RoHS 3 and REACH environmental regulations
• Right-hand threading compatibility with standard assembly tools and processes for streamlined operations

Professional Applications & Engineering Value

These 3/8"-16 UNC flat head screws deliver critical performance advantages in demanding industrial settings where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against chemical exposure and atmospheric corrosion, making these fully threaded fasteners ideal for machinery, structural assemblies, and outdoor equipment. The combination of coarse threading and Class 2A thread fit ensures rapid installation with reliable torque characteristics, while the 82° countersink angle creates flush surfaces that eliminate protrusions in precision applications. Engineered to withstand vibration and heavy loads, these Phillips drive screws maintain clamping force in dynamic operating conditions across manufacturing, construction, and transportation sectors.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 2A thread fit tolerances and UNC coarse thread specifications. Complies with ASME B18.6.3 mechanical and dimensional requirements for flat head screws. Meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety. Threading conforms to Unified National Coarse standards with right-hand direction and full threading along the 1-1/4" length.